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2012 International Symposium on Wireless Communication Systems (ISWCS)最新文献

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Constrained resource allocation for OFDMA cognitive radio networks with primary users activity consideration 考虑主用户活动的OFDMA认知无线网络的约束资源分配
2012 International Symposium on Wireless Communication Systems (ISWCS) Pub Date : 2012-10-25 DOI: 10.1109/ISWCS.2012.6328471
F. Brah, I. Dayoub, L. Vandendorpe
{"title":"Constrained resource allocation for OFDMA cognitive radio networks with primary users activity consideration","authors":"F. Brah, I. Dayoub, L. Vandendorpe","doi":"10.1109/ISWCS.2012.6328471","DOIUrl":"https://doi.org/10.1109/ISWCS.2012.6328471","url":null,"abstract":"In this paper, we consider resource allocation for downlink OFDMA-based cognitive radio (CR) networks. Instead of using only channel information, the statistics of the sensing information conditioned on the primary user (PU) activity is also incorporated in the design and the optimization of the resource allocation. The objective is to maximize the ergodic weighted sum-rate under total power constraint and a per subcarrier based interference power constraint to protect primary users. We develop an optimal solution method and propose a closed-form suboptimal solution with a complexity of O(KN) for K users and N subcarriers. Simulation results are provided to compare the performance of this method with other allocation schemes and to illustrate the trade-off between maximized ergodic weighted sum rate and the constraints.","PeriodicalId":167119,"journal":{"name":"2012 International Symposium on Wireless Communication Systems (ISWCS)","volume":"187 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-10-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124142430","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
On the system level convergence of ILA and DLA for digital predistortion 数字预失真ILA和DLA的系统级收敛性研究
2012 International Symposium on Wireless Communication Systems (ISWCS) Pub Date : 2012-10-25 DOI: 10.1109/ISWCS.2012.6328492
Mazen Abi-Hussein, V. Bohara, O. Venard
{"title":"On the system level convergence of ILA and DLA for digital predistortion","authors":"Mazen Abi-Hussein, V. Bohara, O. Venard","doi":"10.1109/ISWCS.2012.6328492","DOIUrl":"https://doi.org/10.1109/ISWCS.2012.6328492","url":null,"abstract":"In this paper, we present the results for system level convergence of indirect learning architecture (ILA) and direct learning architecture (DLA) for digital predistortion. We show that best performance with ILA and DLA can only be obtained if the system level identification of the power amplifier and predistorter is done iteratively. Results are demonstrated in terms of improvement in adjacent channel power ratio (ACPR) and error vector magnitude (EVM) at the output of power amplifier (PA) with each system level iteration for both the architectures when a Long Term Evolution-Advanced (LTE-Advanced) signal is applied at the input. We also show that predistorter identification with DLA is more robust compared to ILA in presence of additive white Gaussian noise (AWGN).","PeriodicalId":167119,"journal":{"name":"2012 International Symposium on Wireless Communication Systems (ISWCS)","volume":"79 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-10-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115257612","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: 58
Mixed joint source-channel coding schemes for multiple-access-relay channels 多址中继信道的混合联合源信道编码方案
2012 International Symposium on Wireless Communication Systems (ISWCS) Pub Date : 2012-10-25 DOI: 10.1109/ISWCS.2012.6328517
Yonathan Murin, R. Dabora, Deniz Gündüz
{"title":"Mixed joint source-channel coding schemes for multiple-access-relay channels","authors":"Yonathan Murin, R. Dabora, Deniz Gündüz","doi":"10.1109/ISWCS.2012.6328517","DOIUrl":"https://doi.org/10.1109/ISWCS.2012.6328517","url":null,"abstract":"We study the transmission of correlated sources over multiple-access-relay channels, in which both the relay and the destination have access to side information arbitrarily correlated with the sources. We propose two new joint source-channel coding schemes based on novel combinations of the correlation preserving mapping (CPM) technique with Slepian-Wolf (SW) source coding. The proposed coding schemes are based on the decode-and-forward strategy in which CPM is used for encoding information simultaneously to the relay and to the destination, whereas the cooperation information from the relay is transmitted using SW coding. The two schemes differ in the decoding method used at the destination: While the first scheme uses successive backward decoding, the second uses simultaneous backward decoding. We show that none of the schemes can be proved to be universally superior, but both schemes achieve the best known results in all the special cases previously considered.","PeriodicalId":167119,"journal":{"name":"2012 International Symposium on Wireless Communication Systems (ISWCS)","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-10-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115673810","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
Single parity check product codes for erasure recovery in opportunistic spectrum access 机会频谱存取中用于擦除恢复的单奇偶校验产品码
2012 International Symposium on Wireless Communication Systems (ISWCS) Pub Date : 2012-10-25 DOI: 10.1109/ISWCS.2012.6328333
M. Azeem, P. Tortelier, D. L. Ruyet
{"title":"Single parity check product codes for erasure recovery in opportunistic spectrum access","authors":"M. Azeem, P. Tortelier, D. L. Ruyet","doi":"10.1109/ISWCS.2012.6328333","DOIUrl":"https://doi.org/10.1109/ISWCS.2012.6328333","url":null,"abstract":"We address the use of single parity check product codes (SPCPC) for erasure recovery in opportunistic spectrum access schemes, where erasures are packets lost during a collision with the primary user (PU) due to sensing impairments (non detection). Our main motivation in using SPCPC is their low decoding complexity. We derive an analytical performance bound for these product codes when the PU's activity is described by a two-state On/Off model, and give a comparison with simulation results. The main result of the paper is the existence of a good functioning point on the receiver operating characteristic (ROC) curve [1] in terms of spectrum reuse efficiency for the secondary user (SU). Various product codes are compared according to their minimum distance, length and erasure recovery capability for different primary user's activity rate.","PeriodicalId":167119,"journal":{"name":"2012 International Symposium on Wireless Communication Systems (ISWCS)","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-10-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130793571","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
Multihop safety message broadcasting in VANET: A distributed medium access mechanism with a relaying metric VANET中的多跳安全消息广播:一种带有中继度量的分布式媒体访问机制
2012 International Symposium on Wireless Communication Systems (ISWCS) Pub Date : 2012-10-25 DOI: 10.1109/ISWCS.2012.6328387
Yavuz Peksen, T. Acarman
{"title":"Multihop safety message broadcasting in VANET: A distributed medium access mechanism with a relaying metric","authors":"Yavuz Peksen, T. Acarman","doi":"10.1109/ISWCS.2012.6328387","DOIUrl":"https://doi.org/10.1109/ISWCS.2012.6328387","url":null,"abstract":"Vehicular Ad-hoc Networks (VANET) offer promising solutions towards infrastructureless collaborative active safety of the road vehicles. Active safety related data dissemination in vehicle-to-vehicle (V2V) communication requires reliable and real-time transmission. Broadcasting and relaying safety messages to alert the surrounding vehicles about critical driving situations is considered to be timely reaction. Real-time, collision-free and cooperative media access control (MAC) protocols need to be enhanced to guarantee single and multi-hop data dissemination in the vehicular networks. In this paper, media access mechanism for efficient multihop broadcasting is presented. A relaying metric is embedded in the vehicular nodes to assure self-organizing, fast reacting and collision-free medium access mechanism. Two different MAC protocols are studied. The first protocol uses periodical beaconing messages exchanged among the individual nodes and the second protocol does not require those beaconing messages. For both of the cases, the distributed relay-competition and adaptive back-off schemes are simulated on multilane dense traffic. Network simulator (ns-3) simulation results are used to compare the two protocols with and without beaconing messages versus their success rates and network connectivity. To enhance applicability of the protocols, positioning of the vehicular nodes are assumed to be subject to GPS drift and instead of precise position information, sector value is considered.","PeriodicalId":167119,"journal":{"name":"2012 International Symposium on Wireless Communication Systems (ISWCS)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-10-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131045820","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: 10
Slow fading channel selection: A restless multi-armed bandit formulation 慢衰落信道选择:一个不安分的多臂强盗配方
2012 International Symposium on Wireless Communication Systems (ISWCS) Pub Date : 2012-10-25 DOI: 10.1109/ISWCS.2012.6328535
Konstantin Avrachenkov, L. Cottatellucci, L. Maggi
{"title":"Slow fading channel selection: A restless multi-armed bandit formulation","authors":"Konstantin Avrachenkov, L. Cottatellucci, L. Maggi","doi":"10.1109/ISWCS.2012.6328535","DOIUrl":"https://doi.org/10.1109/ISWCS.2012.6328535","url":null,"abstract":"We deal with a multi-access wireless network in which transmitters dynamically select a frequency band to communicate on. The slow fading channel attenuations follow an autoregressive model. In the single user case, we formulate this selection problem as a restless multi-armed bandit problem and we propose two strategies to dynamically select a band at each time slot. Our objective is to maximize the SNR in the long run. Each of these strategies is close to the optimal strategy in different regimes. In the general case with several users, we formulate the problem as a stochastic game with uncountable state space, where the objective is the SINR. Then we propose two strategies to approximate the best response policy for one user when the other users' strategy is fixed.","PeriodicalId":167119,"journal":{"name":"2012 International Symposium on Wireless Communication Systems (ISWCS)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-10-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131365399","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: 7
PAR-aware multi-user precoder for the large-scale MIMO-OFDM downlink 用于大规模MIMO-OFDM下行链路的par感知多用户预编码器
2012 International Symposium on Wireless Communication Systems (ISWCS) Pub Date : 2012-10-25 DOI: 10.1109/ISWCS.2012.6328479
Christoph Studer, E. Larsson
{"title":"PAR-aware multi-user precoder for the large-scale MIMO-OFDM downlink","authors":"Christoph Studer, E. Larsson","doi":"10.1109/ISWCS.2012.6328479","DOIUrl":"https://doi.org/10.1109/ISWCS.2012.6328479","url":null,"abstract":"We consider an orthogonal frequency-division multiplexing (OFDM)-based downlink transmission scheme for large-scale multi-user (MU) multiple-input multiple-output (MIMO) wireless systems. In order to transmit signals with low peak-to-average (power) ratio (PAR), we propose to exploit the massive degrees-of-freedom available in large-scale MU-MIMO-OFDM systems. Specifically, we jointly perform MU precoding, OFDM modulation, and PAR reduction by solving a convex optimization problem at the base station. Numerical results demonstrate tremendous PAR-reduction capabilities of the proposed method, which eventually enables us to use low-cost RF components for the large-scale MU-MIMO-OFDM downlink.","PeriodicalId":167119,"journal":{"name":"2012 International Symposium on Wireless Communication Systems (ISWCS)","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-10-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131279241","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: 7
Frequency synchronisation using SS technique 频率同步使用SS技术
2012 International Symposium on Wireless Communication Systems (ISWCS) Pub Date : 2012-10-25 DOI: 10.1109/ISWCS.2012.6328489
T. Kohda, Y. Jitsumatsu, K. Aihara
{"title":"Frequency synchronisation using SS technique","authors":"T. Kohda, Y. Jitsumatsu, K. Aihara","doi":"10.1109/ISWCS.2012.6328489","DOIUrl":"https://doi.org/10.1109/ISWCS.2012.6328489","url":null,"abstract":"Timing synchronisation is achieved by time (T)-division spread spectrum (SS) code acquisition. Frequency (F)-domain SS code acquisition method is proposed for the recently proposed F-division SS system (FD/S3), which uses T-domain correlation and permits frequency offset. Frequency dual of this method gives a new T-domain code acquisition with F-domain correlation, which is more resistant to frequency offset than the conventional one with T-domain correlation.","PeriodicalId":167119,"journal":{"name":"2012 International Symposium on Wireless Communication Systems (ISWCS)","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-10-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125248877","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
Energy sensing parameterization criteria for cognitive radios 认知无线电的能量感知参数化准则
2012 International Symposium on Wireless Communication Systems (ISWCS) Pub Date : 2012-10-25 DOI: 10.1109/ISWCS.2012.6328330
Miguel Luís, António Furtado, Rodolfo Oliveira, R. Dinis, Luís Bernardo
{"title":"Energy sensing parameterization criteria for cognitive radios","authors":"Miguel Luís, António Furtado, Rodolfo Oliveira, R. Dinis, Luís Bernardo","doi":"10.1109/ISWCS.2012.6328330","DOIUrl":"https://doi.org/10.1109/ISWCS.2012.6328330","url":null,"abstract":"Energy-based sensing (EBS) has been a topic of strong research in the last years due to its importance to Cognitive Radios (CRs). While EBS has been used in several works, different parameterizations have been adopted. In this work we compare different parameterization criteria to determine the decision threshold to the energy detector. We compare their performance through simulations by characterizing the interference caused to primary users and the throughput achieved by the secondary users. We also assess their relative performance.","PeriodicalId":167119,"journal":{"name":"2012 International Symposium on Wireless Communication Systems (ISWCS)","volume":"57 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-10-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115304499","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: 8
20-MHz bandwidth continuous-time delta-sigma modulator for EPWM transmitter 用于EPWM发射机的20 mhz带宽连续时间δ - σ调制器
2012 International Symposium on Wireless Communication Systems (ISWCS) Pub Date : 2012-10-25 DOI: 10.1109/ISWCS.2012.6328495
Young‐Kyun Cho, Sung Jun Lee, Seunghyun Jang, B. Park, J. Jung, Kwangchun Lee
{"title":"20-MHz bandwidth continuous-time delta-sigma modulator for EPWM transmitter","authors":"Young‐Kyun Cho, Sung Jun Lee, Seunghyun Jang, B. Park, J. Jung, Kwangchun Lee","doi":"10.1109/ISWCS.2012.6328495","DOIUrl":"https://doi.org/10.1109/ISWCS.2012.6328495","url":null,"abstract":"A 1.5-bit 20-MHz bandwidth continuous-time delta-sigma modulator (CT-DSM), which is suitable for envelope pulse-width modulation (EPWM) transmitters, is presented. To compensate the process-voltage-temperature variation, a resistor calibration method is proposed. The proposed calibration scheme improves a signal-to-quantization-noise-ratio (SQNR) by 18%. The switched capacitor digital-to-analog converter (DAC) and tri-level output DAC are adopted to improve non-ideal effects and implement multi-level encoding, respectively. Over 44 dB SQNR has been achieved for all corner simulation condition with an oversampling ratio of 13.056 and 20-MHz of bandwidth. The power consumption of the modulator is 11.6 mW from the 1.08 V supply. 1.74% of error vector magnitude can be obtained for a 20 MHz LTE signal with a 9.7 dB peak-to-average power ratio.","PeriodicalId":167119,"journal":{"name":"2012 International Symposium on Wireless Communication Systems (ISWCS)","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-10-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128980517","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: 6
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