This work centers on the downlink scheduling algorithmfor such cellular wireless networks with relays as IEEE802.16j. We propose an efficient algorithm to discover concurrent transmission scenarios under a multihop relay environment, while applying the back-pressure flow control mechanism to reflect the dynamic queue status of each relay station. Then, we develop a linear programming algorithm for scheduling, aiming at maximizing network throughput and achieving fairness. In this linear programming model, we consider the frame-based transmission in wireless cellular networks and the queue dynamics at the relay stations. Simulations are carried out based on IEEE 802.16 OFDMA mode for performance evaluation and comparison in terms of throughput and fairness. The results show the effectiveness of our proposed scheduling algorithm against other cheduling schemes.
{"title":"A Queue-Aware Scheduling Algorithm for Multihop Relay Wireless Cellular Networks","authors":"Haining Chen, Xiaojuan Xie, Hongyi Wu","doi":"10.1109/MWS.2009.13","DOIUrl":"https://doi.org/10.1109/MWS.2009.13","url":null,"abstract":"This work centers on the downlink scheduling algorithmfor such cellular wireless networks with relays as IEEE802.16j. We propose an efficient algorithm to discover concurrent transmission scenarios under a multihop relay environment, while applying the back-pressure flow control mechanism to reflect the dynamic queue status of each relay station. Then, we develop a linear programming algorithm for scheduling, aiming at maximizing network throughput and achieving fairness. In this linear programming model, we consider the frame-based transmission in wireless cellular networks and the queue dynamics at the relay stations. Simulations are carried out based on IEEE 802.16 OFDMA mode for performance evaluation and comparison in terms of throughput and fairness. The results show the effectiveness of our proposed scheduling algorithm against other cheduling schemes.","PeriodicalId":192563,"journal":{"name":"2009 IEEE Mobile WiMAX Symposium","volume":"74 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127193399","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The use of a maximum likelihood (ML) detection scheme is known to be optimum to mitigate other-cell interference near the cell boundary. However, it may not be applicable mainly due to implementation complexity. To alleviate this problem, we consider combined use of ML and minimum-mean-square-error based ordered successive interference cancellation (MMSE-OSIC) detection. The proposed scheme considers ML metric only for signal vectors of desired and adjacent base stations determined by the MMSE-OSIC. Simulation results show that when applied to the mobile-WiMAX systems, the proposed scheme can provide performance almost the same as the ML detection scheme.
{"title":"Low Complexity ML Detection for Other-Cell Interference Mitigation in Mobile WiMAX Systems","authors":"Seung-Hwan Lee, Yong-Hwan Lee","doi":"10.1109/MWS.2009.22","DOIUrl":"https://doi.org/10.1109/MWS.2009.22","url":null,"abstract":"The use of a maximum likelihood (ML) detection scheme is known to be optimum to mitigate other-cell interference near the cell boundary. However, it may not be applicable mainly due to implementation complexity. To alleviate this problem, we consider combined use of ML and minimum-mean-square-error based ordered successive interference cancellation (MMSE-OSIC) detection. The proposed scheme considers ML metric only for signal vectors of desired and adjacent base stations determined by the MMSE-OSIC. Simulation results show that when applied to the mobile-WiMAX systems, the proposed scheme can provide performance almost the same as the ML detection scheme.","PeriodicalId":192563,"journal":{"name":"2009 IEEE Mobile WiMAX Symposium","volume":"63 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127221281","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Multicast and broadcast service (MBS) is one of the important services for next generation wireless systems. In WiMAX, the radio resource unit (i.e., time, frequency, code, etc.) for MBS is centralized allocated by a network device named Anchor ASN-GW. The ASN-GW has to ensure that non-overlapping radio resource units are allocated to BSs for delivering different MBS contents. This paper presents a method to allocate radio resource units in overlapping MBS Zones. We proposed radio resource allocation and re-allocation algorithms to minimize the number of re-allocated resource unit due to the change of MBS Zones topology. Simulation result shows that the proposed algorithms can reduce the number of re-allocations and thus, reduce the signaling message exchanged in the air interface and the core network.
多播广播业务(Multicast and broadcast service, MBS)是下一代无线系统的重要业务之一。在WiMAX中，MBS的无线电资源单元(即时间、频率、码等)由一个名为Anchor ASN-GW的网络设备集中分配。ASN-GW必须确保将不重叠的无线电资源单元分配给不同的BSs，以发送不同的MBS内容。本文提出了一种在重叠MBS区域内分配无线电资源单元的方法。提出了无线资源分配和重分配算法，以减少由于MBS区域拓扑结构的变化而导致的资源重分配。仿真结果表明，该算法可以减少重分配次数，从而减少空口和核心网之间的信令交换。
{"title":"Radio Resource Allocation for Overlapping MBS Zones","authors":"R. Cheng, Kuo-Jui Huang, Jen-Shun Yang","doi":"10.1109/MWS.2009.27","DOIUrl":"https://doi.org/10.1109/MWS.2009.27","url":null,"abstract":"Multicast and broadcast service (MBS) is one of the important services for next generation wireless systems. In WiMAX, the radio resource unit (i.e., time, frequency, code, etc.) for MBS is centralized allocated by a network device named Anchor ASN-GW. The ASN-GW has to ensure that non-overlapping radio resource units are allocated to BSs for delivering different MBS contents. This paper presents a method to allocate radio resource units in overlapping MBS Zones. We proposed radio resource allocation and re-allocation algorithms to minimize the number of re-allocated resource unit due to the change of MBS Zones topology. Simulation result shows that the proposed algorithms can reduce the number of re-allocations and thus, reduce the signaling message exchanged in the air interface and the core network.","PeriodicalId":192563,"journal":{"name":"2009 IEEE Mobile WiMAX Symposium","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117026076","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Hsing-Shao Liu, Chia-Hui Wang, R. Chang, Ching-Chia Hsieh
WiMAX is the emerging BWA (Broadband Wireless Access) technology of next generation because of its mobility, coverage and high transmission speed. Therefore, many diversified network applications and services can be applied further for the prevalence of nomadic clients. In this paper, we introduce a new network deployment of WiMAX to effectively provide high-quality video streaming of live news reporting (i.e. LNR) for TV stations in Taiwan, Both services of WiTV (IPTV over WiMAX) and e-SNG (WiMAX News Gathering) are provided for users and reporters respectively in proposed WiMAX deployment. Besides, to effectively provide LNR service, this island-wide WiMAX network deployment with access range of more than 350Km applies not only the relays of digital microwave links with end-to-end distance reaching to 70Km, but also the port-based VLANs to differentiate services to guarantee quality of service for LNR without interference from other irrelevant traffics. On the test-bed of proposed WiMAX deployment, the performance results from experiments on H.264/SD video streaming demonstrate cost-effectiveness and feasibility of LNR for TV stations.
WiMAX是新兴的下一代宽带无线接入(BWA)技术，因为它具有移动性、覆盖范围和高传输速度。因此，许多多样化的网络应用和服务可以进一步应用于游牧客户端的流行。在本文中，我们介绍了一种新的WiMAX网络部署，以有效地为台湾电视台提供高质量的新闻直播视频流(即LNR)，在提出的WiMAX部署中，分别为用户和记者提供了WiTV (IPTV over WiMAX)和e-SNG (WiMAX news Gathering)服务。此外，为了有效提供LNR业务，本次全岛WiMAX网络部署的接入范围超过350Km，除了采用端到端距离达到70Km的数字微波链路中继外，还采用基于端口的vlan进行业务区分，保证LNR业务质量，不受其他无关业务的干扰。在提出的WiMAX部署测试平台上，H.264/SD视频流的性能实验结果证明了电视台使用LNR的成本效益和可行性。
{"title":"A Cost-Effective WiMAX Deployment for High-Quality Video Streaming of Live News Reporting","authors":"Hsing-Shao Liu, Chia-Hui Wang, R. Chang, Ching-Chia Hsieh","doi":"10.1109/MWS.2009.28","DOIUrl":"https://doi.org/10.1109/MWS.2009.28","url":null,"abstract":"WiMAX is the emerging BWA (Broadband Wireless Access) technology of next generation because of its mobility, coverage and high transmission speed. Therefore, many diversified network applications and services can be applied further for the prevalence of nomadic clients. In this paper, we introduce a new network deployment of WiMAX to effectively provide high-quality video streaming of live news reporting (i.e. LNR) for TV stations in Taiwan, Both services of WiTV (IPTV over WiMAX) and e-SNG (WiMAX News Gathering) are provided for users and reporters respectively in proposed WiMAX deployment. Besides, to effectively provide LNR service, this island-wide WiMAX network deployment with access range of more than 350Km applies not only the relays of digital microwave links with end-to-end distance reaching to 70Km, but also the port-based VLANs to differentiate services to guarantee quality of service for LNR without interference from other irrelevant traffics. On the test-bed of proposed WiMAX deployment, the performance results from experiments on H.264/SD video streaming demonstrate cost-effectiveness and feasibility of LNR for TV stations.","PeriodicalId":192563,"journal":{"name":"2009 IEEE Mobile WiMAX Symposium","volume":"76 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114839554","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Security in wireless networks has traditionally been considered to be an issue to be addressed at the higher layers of the network. However, with the emergence of ad hoc and other less centralized networking architectures, there has been an increase in interest in the potential of the wireless physical layer to provide communications security. Information theory provides a natural framework for the study of this issue, and consequently there has been a resurgence of interest in information-theoretic security in recent years, particularly for wireless channel models. This work has expanded on earlier ideas about secure broadcast, by examining multiple-access channels, fading, code design, source coding, authentication, network coding, and many other issues. This paper will review recent works in the field of wireless security specially taking into account the OFDM(A)-based systems, e.g, Long Term Evolution (LTE) and WiMAX.
{"title":"State of the Art of the Wireless Security in OFDM(A)-Based Systems","authors":"N. Prasad","doi":"10.1109/MWS.2009.48","DOIUrl":"https://doi.org/10.1109/MWS.2009.48","url":null,"abstract":"Security in wireless networks has traditionally been considered to be an issue to be addressed at the higher layers of the network. However, with the emergence of ad hoc and other less centralized networking architectures, there has been an increase in interest in the potential of the wireless physical layer to provide communications security. Information theory provides a natural framework for the study of this issue, and consequently there has been a resurgence of interest in information-theoretic security in recent years, particularly for wireless channel models. This work has expanded on earlier ideas about secure broadcast, by examining multiple-access channels, fading, code design, source coding, authentication, network coding, and many other issues. This paper will review recent works in the field of wireless security specially taking into account the OFDM(A)-based systems, e.g, Long Term Evolution (LTE) and WiMAX.","PeriodicalId":192563,"journal":{"name":"2009 IEEE Mobile WiMAX Symposium","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129657043","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Bruce Chow, M. Yee, M. Sauer, A. Ng'oma, Ming-Chien Tseng, C. Yeh
Wireless broadband access for mobile applications is an area of increasing growth. An international collaboration, led by the Taiwan Industrial Technology Research Institute (ITRI), has been working to implement a dedicated WiMAX network for a user field trial on the Taiwan High Speed Rail (THSR) bullet train system. Continuous wireless coverage at train speeds up to 300km/hr is challenging due to a number of critical issues, including handover at high speeds and coverage in challenging terrain such as tunnels. A Radio-over-Fiber (RoF) Distributed Antenna System (DAS) was developed by Corning Incorporated to address the critical issue of handover and increase the coverage for each WiMAX basestation. For a DAS deployment consisting of multiple discrete antennas, proper signal strength management is required because the maximum delay spread allowed by the WiMAX protocol is easily surpassed at realistic fiber ranges up to 9km. This paper reviews some of the initial results of the RoF DAS experiments in SongShan tunnel in Taipei. Error-free signal transmission was achieved when the difference in received power from two consecutive antennas was greater than 10dB.
{"title":"Radio-over-Fiber Distributed Antenna System for WiMAX Bullet Train Field Trial","authors":"Bruce Chow, M. Yee, M. Sauer, A. Ng'oma, Ming-Chien Tseng, C. Yeh","doi":"10.1109/MWS.2009.33","DOIUrl":"https://doi.org/10.1109/MWS.2009.33","url":null,"abstract":"Wireless broadband access for mobile applications is an area of increasing growth. An international collaboration, led by the Taiwan Industrial Technology Research Institute (ITRI), has been working to implement a dedicated WiMAX network for a user field trial on the Taiwan High Speed Rail (THSR) bullet train system. Continuous wireless coverage at train speeds up to 300km/hr is challenging due to a number of critical issues, including handover at high speeds and coverage in challenging terrain such as tunnels. A Radio-over-Fiber (RoF) Distributed Antenna System (DAS) was developed by Corning Incorporated to address the critical issue of handover and increase the coverage for each WiMAX basestation. For a DAS deployment consisting of multiple discrete antennas, proper signal strength management is required because the maximum delay spread allowed by the WiMAX protocol is easily surpassed at realistic fiber ranges up to 9km. This paper reviews some of the initial results of the RoF DAS experiments in SongShan tunnel in Taipei. Error-free signal transmission was achieved when the difference in received power from two consecutive antennas was greater than 10dB.","PeriodicalId":192563,"journal":{"name":"2009 IEEE Mobile WiMAX Symposium","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128078216","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Frequency reuse is an important topic in wireless communications systems. In this paper, we address the issue of frequency reuse in sectored cells which are subject to interfer-ence in the overlap regions of adjacent sectors. We propose to increase the number of sectors from 3 to 4 using conventional base station sector antennas with beam-width exceeding 120°, which purposely creates large overlap regions between adjacent sectors. Rather than treating the signals of adjacent sectors as interference, we investigate sector cooperation for communica-tion with users located in the overlap regions. Different scenarios are considered for user locations, and simulation results are given which illustrate the performance of the proposed schemes.
{"title":"Full Frequency Reuse in Mobile WiMAX and LTE Networks with Sectored Cells","authors":"H. Sari, S. Sezginer, E. Vivier","doi":"10.1109/MWS.2009.42","DOIUrl":"https://doi.org/10.1109/MWS.2009.42","url":null,"abstract":"Frequency reuse is an important topic in wireless communications systems. In this paper, we address the issue of frequency reuse in sectored cells which are subject to interfer-ence in the overlap regions of adjacent sectors. We propose to increase the number of sectors from 3 to 4 using conventional base station sector antennas with beam-width exceeding 120°, which purposely creates large overlap regions between adjacent sectors. Rather than treating the signals of adjacent sectors as interference, we investigate sector cooperation for communica-tion with users located in the overlap regions. Different scenarios are considered for user locations, and simulation results are given which illustrate the performance of the proposed schemes.","PeriodicalId":192563,"journal":{"name":"2009 IEEE Mobile WiMAX Symposium","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133046309","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The base station (BS) deployment planning is become more complex for the next-generation wireless networks, which is an architecture with multi-tier topology. The multiple coexist networks are deployed to serve different kinds of mobile users that their traffic requirements and moving speeds are different. Thus, in this paper, we discuss how to deploy the heterogenous BSs that support differentservice ranges, costs, speeds, capacities, and delay requirements with budgetary limit. The problem is formulated as an integer non-linear programming problem. Accordingly, we proposed some placement algorithms (i.e., Lagrangean Relaxation and simulated annealing approaches) to give a deployment strategy based on constructed BSs to minimize the total deployment cost under the satisfaction of user requirements. The experiment results show the heuristics based on the cost per unit of service point is the best than other two methods.
{"title":"Heterogeneous Base Station Placement for Wireless Networks","authors":"Y. Wen","doi":"10.1109/MWS.2009.39","DOIUrl":"https://doi.org/10.1109/MWS.2009.39","url":null,"abstract":"The base station (BS) deployment planning is become more complex for the next-generation wireless networks, which is an architecture with multi-tier topology. The multiple coexist networks are deployed to serve different kinds of mobile users that their traffic requirements and moving speeds are different. Thus, in this paper, we discuss how to deploy the heterogenous BSs that support differentservice ranges, costs, speeds, capacities, and delay requirements with budgetary limit. The problem is formulated as an integer non-linear programming problem. Accordingly, we proposed some placement algorithms (i.e., Lagrangean Relaxation and simulated annealing approaches) to give a deployment strategy based on constructed BSs to minimize the total deployment cost under the satisfaction of user requirements. The experiment results show the heuristics based on the cost per unit of service point is the best than other two methods.","PeriodicalId":192563,"journal":{"name":"2009 IEEE Mobile WiMAX Symposium","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121147982","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
This paper presents a link adaptation scheme for the MIMO-OFDM system to achieve high spectral efficiency in a required BER performance. The modulation order and MIMO transmission mode are selected via a look-up table according to the SNR and Rician channel K-factor instead of the channel relative condition number. The BER and spectral efficiency performance of the MIMO-OFDM system is evaluated by simulation. Result shows that the spectral efficiency can be achieved up to 9bps/Hz under Rician channel K-factor of 3.3dB when SNR is 30dB. The spectral efficiency is higher under low K-factor Rician channel than in high K-factor one. The throughput of the proposed adaptive MIMO-OFDM system considers both K-factor of the Rician channel and SNR can be achieved up to 80Mbps higher than the method without considering the Rician channel K-factor.
{"title":"Link Adaptation of MIMO-OFDM Transmission Exploiting the Rician Channel K-factor","authors":"Kun-Yi Lin, Rong-Terng Juang, Hsin-Piao Lin, Wen-Jun Shyu, Pangan Ting","doi":"10.1109/MWS.2009.29","DOIUrl":"https://doi.org/10.1109/MWS.2009.29","url":null,"abstract":"This paper presents a link adaptation scheme for the MIMO-OFDM system to achieve high spectral efficiency in a required BER performance. The modulation order and MIMO transmission mode are selected via a look-up table according to the SNR and Rician channel K-factor instead of the channel relative condition number. The BER and spectral efficiency performance of the MIMO-OFDM system is evaluated by simulation. Result shows that the spectral efficiency can be achieved up to 9bps/Hz under Rician channel K-factor of 3.3dB when SNR is 30dB. The spectral efficiency is higher under low K-factor Rician channel than in high K-factor one. The throughput of the proposed adaptive MIMO-OFDM system considers both K-factor of the Rician channel and SNR can be achieved up to 80Mbps higher than the method without considering the Rician channel K-factor.","PeriodicalId":192563,"journal":{"name":"2009 IEEE Mobile WiMAX Symposium","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123899283","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Mai Tran, David Halls, Andy Nix, A. Doufexi, Mark Beach
The WiMAX standard has emerged to harmonise the wide variety of Broadband Wireless Access (BWA) technologies. The recent mobile WiMAX standard (802.16e) supports broadband applications to mobile terminals and laptops in urban environments. Mobile WiMAX supports a full range of multiple-input multiple-output (MIMO) techniques including space time block coding (STBC), spatial multiplexing (SM) and eigen-beamforming (EB). This paper compares the performance of the above schemes in terms of achievable throughput and operating range. Simulated packet error rate (PER) and throughput results are presented for each MIMO technique, and for a range of modulation and coding rates. Based on a typical link-budget, the expected throughput for each scheme is computed as a function of the basestation-terminal separation distance. The paper highlights the use of Adaptive MIMO Switching (AMS) in mobile WiMAX. The SNR switching points between each MIMO mode is determined and their dependency on channel spatial correlation is demonstrated. Finally the operating range of the different MIMO schemes is determined (based on a 10% PER) for a mobile WiMAX system. The use of eigen-beamforming together with AMS is shown to offer significant performance benefits in terms of robustness, capacity and operating range. For the scenario under test, the use of eigen-beamforming (based on the dominant eigen-mode) extends the operating range by 16%, and doubles the received data rate for 65% of locations.
{"title":"Mobile WiMAX Downlink Performance Analysis with Adaptive MIMO Switching","authors":"Mai Tran, David Halls, Andy Nix, A. Doufexi, Mark Beach","doi":"10.1109/MWS.2009.34","DOIUrl":"https://doi.org/10.1109/MWS.2009.34","url":null,"abstract":"The WiMAX standard has emerged to harmonise the wide variety of Broadband Wireless Access (BWA) technologies. The recent mobile WiMAX standard (802.16e) supports broadband applications to mobile terminals and laptops in urban environments. Mobile WiMAX supports a full range of multiple-input multiple-output (MIMO) techniques including space time block coding (STBC), spatial multiplexing (SM) and eigen-beamforming (EB). This paper compares the performance of the above schemes in terms of achievable throughput and operating range. Simulated packet error rate (PER) and throughput results are presented for each MIMO technique, and for a range of modulation and coding rates. Based on a typical link-budget, the expected throughput for each scheme is computed as a function of the basestation-terminal separation distance. The paper highlights the use of Adaptive MIMO Switching (AMS) in mobile WiMAX. The SNR switching points between each MIMO mode is determined and their dependency on channel spatial correlation is demonstrated. Finally the operating range of the different MIMO schemes is determined (based on a 10% PER) for a mobile WiMAX system. The use of eigen-beamforming together with AMS is shown to offer significant performance benefits in terms of robustness, capacity and operating range. For the scenario under test, the use of eigen-beamforming (based on the dominant eigen-mode) extends the operating range by 16%, and doubles the received data rate for 65% of locations.","PeriodicalId":192563,"journal":{"name":"2009 IEEE Mobile WiMAX Symposium","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130190298","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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