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Cooperation diversity scenarios for clipped OFDM with iterative destination node reception 目的节点接收迭代截断OFDM的合作分集方案
2010 Wireless Telecommunications Symposium (WTS) Pub Date : 2010-04-21 DOI: 10.1109/WTS.2010.5479640
T. Ketseoglou
{"title":"Cooperation diversity scenarios for clipped OFDM with iterative destination node reception","authors":"T. Ketseoglou","doi":"10.1109/WTS.2010.5479640","DOIUrl":"https://doi.org/10.1109/WTS.2010.5479640","url":null,"abstract":"A realistic framework for cooperation diversity is presented for Orthogonal Frequency Division Multiplexing (OFDM) systems with clipping type of transmitter non-linearities. The destination node processes together the received information from the source node and a single, selection algorithm dependent relay one (if any of the candidate relays succeeds in decoding the original OFDM packet sent). The relayed packets are the same with the direct ones (repetition coding), so that simpler receiver processing applies. The destination node employs an optimized, iterative receiver structure based on Turbo processing, in which both the channels and the clipping distortion are (iteratively) estimated. The relaying nodes receive the source-node emanating packets in a standard, non-iterative fashion, due to delay constraints. Two methods of relay node selection are considered: a) Random Relay Selection (RRS), and b) Optimal Relay Selection (ORS). High gains are showed for the proposed approach, due to the synergy between clipping distortion, channel estimation and multiple transmission paths, based on node cooperation diversity. In addition, when the number of candidate relay nodes increases, it is shown that ORS performs significantly better than RRS.","PeriodicalId":117027,"journal":{"name":"2010 Wireless Telecommunications Symposium (WTS)","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-04-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127796526","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}
引用次数: 2
Adaptive admission control in a NGN service platform NGN业务平台的自适应准入控制
2010 Wireless Telecommunications Symposium (WTS) Pub Date : 2010-04-21 DOI: 10.1109/WTS.2010.5479674
André Ferreira, P. Carvalho, S. R. Lima
{"title":"Adaptive admission control in a NGN service platform","authors":"André Ferreira, P. Carvalho, S. R. Lima","doi":"10.1109/WTS.2010.5479674","DOIUrl":"https://doi.org/10.1109/WTS.2010.5479674","url":null,"abstract":"In NGN service-provisioning platforms the existence of an efficient and flexible admission control mechanism is essential for providing quality of service in a reliable and stable way, avoiding congestion scenarios caused by indiscriminate and uncontrolled service requests. The capability of modulating and regulating the rate of call acceptance, and provide service differentiation allow indirect control of the load submitted to the platform. This paper presents a service admission control solution that enables to differentiate, limit and modulate the rate by which service requests are submitted into a NGN service-provisioning platform. The solution is focused on providing a fair level of bandwidth sharing among service classes, in a configurable and dynamic way so that it can adapt the distribution by which service requests are served. To sustain the design goals of our solution, major scheduling disciplines and rate control mechanisms are here studied and compared in order to elect the more adequate components. The implemented solution was submitted to unit and charge tests; the results show its effectiveness and robustness in controlling and differentiating incoming service calls.","PeriodicalId":117027,"journal":{"name":"2010 Wireless Telecommunications Symposium (WTS)","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-04-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130890384","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}
引用次数: 3
Content-Based Rate-Adaptive transfer of SVC-encoded video over MIMO communication systems MIMO通信系统上基于内容的svc编码视频自适应速率传输
2010 Wireless Telecommunications Symposium (WTS) Pub Date : 2010-04-21 DOI: 10.1109/WTS.2010.5479668
Daniela Radakovic, R. Ansari, Yingwei Yao
{"title":"Content-Based Rate-Adaptive transfer of SVC-encoded video over MIMO communication systems","authors":"Daniela Radakovic, R. Ansari, Yingwei Yao","doi":"10.1109/WTS.2010.5479668","DOIUrl":"https://doi.org/10.1109/WTS.2010.5479668","url":null,"abstract":"A novel COntent-Based Rate-Adaptation (COBRA) model is proposed to improve the quality of video transmission over multiple-input multiple-output (MIMO) system with channel state information feedback (CSI). The model captures relationships among the video content type, video sub-stream bit-rates, achievable peak signal-to-noise ratios (PSNR), and channel bit error rate (BER). COBRA facilitates joint selection of physical layer parameters and video sub-stream configuration. Unlike existing methods, the COBRA model offers an efficient way of balancing losses in PSNR due to channel errors and non-transmission of some enhancements layers in a sub-stream, with a judicious mechanism of selecting sub-stream configurations and communication parameters. Simulations show that COBRA maintains video quality at acceptable levels over wide range of low channel signal-to-noise ratio (SNR) values. It achieves the same video PSNR as obtained by the complete stream transmission at 10 dB higher channel SNR.","PeriodicalId":117027,"journal":{"name":"2010 Wireless Telecommunications Symposium (WTS)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-04-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130335323","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}
引用次数: 4
EVM based AMC for an OFDM system 基于EVM的OFDM系统AMC
2010 Wireless Telecommunications Symposium (WTS) Pub Date : 2010-04-21 DOI: 10.1109/WTS.2010.5479643
Ramdane Chouitem
{"title":"EVM based AMC for an OFDM system","authors":"Ramdane Chouitem","doi":"10.1109/WTS.2010.5479643","DOIUrl":"https://doi.org/10.1109/WTS.2010.5479643","url":null,"abstract":"A conventional OFDM system often poses a stringent linearity requirement to the transmitter, especially the radio-frequency power amplifier (RFPA), to maintain its bit error rate (BER). As a result, the output power from a RFPA is often limited, thus, the communication distance is compromised. With the deployment of WiMAX (IEEE 802.16), which is targeting at the mobile market, the communication distance is a concern. In this project, we propose to use Adaptive Modulation and Coding (AMC) to adaptively control the digital modulation and the output power of a RFPA. When the AMC selects the modulation order with the coding rate to achieve the targeted BER, the output power of a RFPA can be increased as long as its Error Vector Magnitude (EVM) is less than the required. Therefore, the communication distance of an OFDM system could be intelligently extended.","PeriodicalId":117027,"journal":{"name":"2010 Wireless Telecommunications Symposium (WTS)","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-04-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131043429","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}
引用次数: 13
An efficient wireless switching architecture 一种高效的无线交换架构
2010 Wireless Telecommunications Symposium (WTS) Pub Date : 2010-04-21 DOI: 10.1109/WTS.2010.5479653
Jaewook Shim, K. Yun, R. Cruz
{"title":"An efficient wireless switching architecture","authors":"Jaewook Shim, K. Yun, R. Cruz","doi":"10.1109/WTS.2010.5479653","DOIUrl":"https://doi.org/10.1109/WTS.2010.5479653","url":null,"abstract":"We present a wireless switching architecture that allows a self-interference-free asynchronous packet communication in multi-channel wireless switching networks. We propose a system architecture to get around the self-interference problem, which arises due to the proximity among RF devices in the switch and the large difference in strengths between receiving and transmitting signals. We then present a straightforward solution of separating the frequency spectra used for receiving and transmitting signals and propose a MAC/PHY cross-layer protocol for efficiently managing the channel bandwidth for asynchronous packet-based communication. We show that, when a K-port wireless switch with each port providing 20MHz of bidirectional bandwidth, the total communication bandwidth can be increased to 1.4K×20MHz, which is about 2K times as high as a wireless access point with 20MHz per channel. Finally, we introduce a scheduling scheme with a dynamic load balancing to ensure global fairness for all users. The performance of our algorithm is compared to that of the Least-Loaded-First (LLF) user assignment policy using simulations.","PeriodicalId":117027,"journal":{"name":"2010 Wireless Telecommunications Symposium (WTS)","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-04-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127100050","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}
引用次数: 2
Impact of mobility prediction on the performance of Cognitive Radio networks 移动性预测对认知无线电网络性能的影响
2010 Wireless Telecommunications Symposium (WTS) Pub Date : 2010-04-21 DOI: 10.1109/WTS.2010.5479659
I. Butun, A. Talay, D. Altilar, M. Khalid, R. Sankar
{"title":"Impact of mobility prediction on the performance of Cognitive Radio networks","authors":"I. Butun, A. Talay, D. Altilar, M. Khalid, R. Sankar","doi":"10.1109/WTS.2010.5479659","DOIUrl":"https://doi.org/10.1109/WTS.2010.5479659","url":null,"abstract":"Wireless technology has enabled the development of increasingly diverse applications and devices resulting in an exponential growth in usage and services. These advancements made the radio frequency spectrum a scarce resource, and consequently, its efficient use is of the ultimate importance. To cope with the growing demand, network design focused on increasing the spectral efficiency by making use of advancement in Cognitive Radio technology. Cognitive Radio can reduce the spectrum shortage problem by enabling unlicensed users equipped with Cognitive Radios to reuse and share the licensed spectrum bands. Using the fact that a Cognitive Radio is capable of sensing the environmental conditions and automatically adapting its operating parameters in order to enhance network performance, we would like to make use of its knowledge to predict the mobility of Cognitive Radio users to improve the overall performance of the Cognitive Radio network. This study makes novel use of mobility prediction techniques to enhance reliability, bandwidth efficiency and scalability of the cognitive radio networks. Firstly, prediction techniques are evaluated and compared for prediction accuracy. Secondly, routing protocol reliability, efficiency and scalability performances are evaluated under different prediction techniques. Simulation results verify the performance improvements even with moderate accuracy predictors. Results clearly show that hybrid Markov CDF prediction performs the best. When compared with no prediction it significantly improves average reliability and efficiency by 11% and 8%, respectively.","PeriodicalId":117027,"journal":{"name":"2010 Wireless Telecommunications Symposium (WTS)","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-04-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122116215","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}
引用次数: 42
Low-power baseband processing for wireless multimedia systems using unequal error protection 采用不等错误保护的无线多媒体系统的低功耗基带处理
2010 Wireless Telecommunications Symposium (WTS) Pub Date : 2010-04-21 DOI: 10.1109/WTS.2010.5479633
Yoon Seok Yang, G. Choi
{"title":"Low-power baseband processing for wireless multimedia systems using unequal error protection","authors":"Yoon Seok Yang, G. Choi","doi":"10.1109/WTS.2010.5479633","DOIUrl":"https://doi.org/10.1109/WTS.2010.5479633","url":null,"abstract":"This paper presents a low-power baseband-video joint decoder design using a novel unequal error protection (UEP) scheme for wireless telecommunications. This method is developed for H.264 layered (data partitioned) video transmission over low density parity check (LDPC) codec. We exploit the fact that not all transmitted data require the same level of error protection; this is known as unequal error protection. In particular, we use a variable iteration LDPC decoding scheme along with H.264 data partitioning (DP). In this scheme, we determine and use variable iterations that are needed by the LDPC baseband decoder to achieve pre-specified image qualities at the receiver and apply power gating to minimize energy consumption.","PeriodicalId":117027,"journal":{"name":"2010 Wireless Telecommunications Symposium (WTS)","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-04-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117213292","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}
引用次数: 1
Unified 3GPP and 3GPP2 turbo encoder FPGA implementation using run-time partial reconfiguration 统一3GPP和3GPP2 turbo编码器的FPGA实现，使用运行时部分重构
2010 Wireless Telecommunications Symposium (WTS) Pub Date : 2010-04-21 DOI: 10.1109/WTS.2010.5479671
Shikha Tripathi, R. Mathur, J. Arya
{"title":"Unified 3GPP and 3GPP2 turbo encoder FPGA implementation using run-time partial reconfiguration","authors":"Shikha Tripathi, R. Mathur, J. Arya","doi":"10.1109/WTS.2010.5479671","DOIUrl":"https://doi.org/10.1109/WTS.2010.5479671","url":null,"abstract":"One key objective of Software Defined radio is to implement multiple standards on common hardware. This can be achieved by partial reconfiguration of Field Programmable Gate Array (FPGA) in which some part of the FPGA remains active while other gets reconfigured. This paper proposes partially reconfigurable design of unified turbo encoder of two 3G standards-3GPP and 3GPP2 on FPGA Xilinx Virtex- IV. The design shows substantial improvement in hardware implementation of the interleavers over the previous designs. In order to achieve the best possible results with partial reconfiguration, maximum common functionality from both the turbo encoders has been identified and a unified architecture has been proposed. Novel ways have been devised to perform the computationally intensive operations of the 3GPP interleaver with minimal hardware requirement and least possible number of clock cycles.","PeriodicalId":117027,"journal":{"name":"2010 Wireless Telecommunications Symposium (WTS)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-04-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129308809","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}
引用次数: 5
A polynomial phasing scheme to realize minimum crest factor for multicarrier transmission 一种实现多载波传输波峰系数最小的多项式相位方案
2010 Wireless Telecommunications Symposium (WTS) Pub Date : 2010-04-21 DOI: 10.1109/WTS.2010.5479634
Yanyan Wu
{"title":"A polynomial phasing scheme to realize minimum crest factor for multicarrier transmission","authors":"Yanyan Wu","doi":"10.1109/WTS.2010.5479634","DOIUrl":"https://doi.org/10.1109/WTS.2010.5479634","url":null,"abstract":"High peak-to-average power ratio (PAPR) in multi-carrier systems such as OFDM can significantly reduce power efficiency and performance. Existing methods to mitigate this problem are known in three major categories, i.e. clipping /filtering, convex optimisation and stochastic approach. In this paper, a polynomial phasing scheme is proposed to achieve maximum PAPR reduction for a multicarrier OFDM signal. Using this scheme, each subcarrier phase is adjusted by a polynomial function of the subcarrier index. The coefficients of such polynomial function can be determined at the transmitter by a search method, and can be conveyed using existing pilot tones. The scheme promising maximum PAPR reduction with no distortion to the spectral mask or loss in data rate requires little change to existing OFDM standards.","PeriodicalId":117027,"journal":{"name":"2010 Wireless Telecommunications Symposium (WTS)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-04-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132276018","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}
引用次数: 1
Decision feedback channel estimation for Alamouti coded OFDM-MIMO systems Alamouti编码OFDM-MIMO系统的决策反馈信道估计
2010 Wireless Telecommunications Symposium (WTS) Pub Date : 2010-04-21 DOI: 10.1109/WTS.2010.5479648
M. Hoseinzade, K. Mohamed-Pour, S. Andargoli, A. Gharanjik
{"title":"Decision feedback channel estimation for Alamouti coded OFDM-MIMO systems","authors":"M. Hoseinzade, K. Mohamed-Pour, S. Andargoli, A. Gharanjik","doi":"10.1109/WTS.2010.5479648","DOIUrl":"https://doi.org/10.1109/WTS.2010.5479648","url":null,"abstract":"In this paper, we propose a new channel estimation algorithm for orthogonal frequency division multiplexing (OFDM) systems. For fast fading environment, we introduce a new method which is extended to the Alamouti Coded OFDM case. At the first stage of this algorithm, the channel response is estimated for pilot sub-carriers and then, the channel response for data sub-carriers are interpolated by Gaussian Radial Basis function as it is an efficient nonlinear interpolator. The post-processing and filtering on the estimated channel taps energy are proposed to improve the estimation performance and reduce the noise effects of primary estimation, which is caused by LS estimation at pilot data. The accuracy of our channel estimation algorithm is improved by using iterative decision feedback. The decision feedback method is used to update channel parameters in each OFDM symbol. The effectiveness of new techniques is demonstrated through the simulation of an Alamouti coded OFDM system with two-transmit and two-receive antennas. Finally, the results are analyzed and compared with previous algorithms which show performance enhancement.","PeriodicalId":117027,"journal":{"name":"2010 Wireless Telecommunications Symposium (WTS)","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-04-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115910494","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}
引用次数: 5
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