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2009 First UK-India International Workshop on Cognitive Wireless Systems (UKIWCWS)最新文献

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Cooperative compressive spectrum sensing by sub-Nyquist sampling 基于亚奈奎斯特采样的协同压缩频谱感知
2009 First UK-India International Workshop on Cognitive Wireless Systems (UKIWCWS) Pub Date : 2009-12-01 DOI: 10.1109/UKIWCWS.2009.5749398
Hongjian Sun, D. Laurenson, J. Thompson
{"title":"Cooperative compressive spectrum sensing by sub-Nyquist sampling","authors":"Hongjian Sun, D. Laurenson, J. Thompson","doi":"10.1109/UKIWCWS.2009.5749398","DOIUrl":"https://doi.org/10.1109/UKIWCWS.2009.5749398","url":null,"abstract":"Compressive Sensing (CS) is a novel framework shows that a Qb-point discrete time signal that is k-sparse, can be exactly recovered by using small amounts of linear projections. In this paper, we propose an aliasing-based distributed compressive spectrum sensing technique for Cognitive Radio (CR) networks. We firstly model the spectrum aliasing phenomenon as a linear projection from the ideal sampled spectrum to the sub-sampled spectrum. Then the necessary conditions for jointly reconstructing the spectrum without aliasing are provided. Rather than using separate compression device, the Analog-to-Digital Converters (ADCs) in our proposed method perform data compression as well as sampling. More important, with multiple receivers operating at sub-Nyquist sampling rates, the fusion centre can effectively recover the spectrum without aliasing.","PeriodicalId":198556,"journal":{"name":"2009 First UK-India International Workshop on Cognitive Wireless Systems (UKIWCWS)","volume":"257 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122712374","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
Sequential detection based cooperative spectrum sensing algorithms in cognitive radio 认知无线电中基于顺序检测的协同频谱感知算法
2009 First UK-India International Workshop on Cognitive Wireless Systems (UKIWCWS) Pub Date : 2009-12-01 DOI: 10.1109/UKIWCWS.2009.5749426
A. Jayaprakasam, V. Sharma
{"title":"Sequential detection based cooperative spectrum sensing algorithms in cognitive radio","authors":"A. Jayaprakasam, V. Sharma","doi":"10.1109/UKIWCWS.2009.5749426","DOIUrl":"https://doi.org/10.1109/UKIWCWS.2009.5749426","url":null,"abstract":"This paper considers the problem of Spectrum Sensing in Cognitive Radio Networks. For this we use a recently developed distributed cooperative algorithm DualCUSUM. The algorithm is based on sequential change detection techniques which optimally use the past observations. But DualCUSUM requires the knowledge of the channel gains for each of the secondary users. In this work we modify DualCUSUM to develop GLR-CUSUM which can work with imprecise estimates of the channel gains. Next we extend the algorithm to the case where the receiver noise power is also not known exactly. We show that the SNR wall problem encountered in this scenario is not experienced by our algorithm.","PeriodicalId":198556,"journal":{"name":"2009 First UK-India International Workshop on Cognitive Wireless Systems (UKIWCWS)","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129200048","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: 24
A novel multiple access scheme using MSE-OFDM for uplink 采用MSE-OFDM作为上行链路的一种新型多址方案
2009 First UK-India International Workshop on Cognitive Wireless Systems (UKIWCWS) Pub Date : 2009-12-01 DOI: 10.1109/UKIWCWS.2009.5749386
Poonam Singh, S. Chakrabarti, R. Rajakumar
{"title":"A novel multiple access scheme using MSE-OFDM for uplink","authors":"Poonam Singh, S. Chakrabarti, R. Rajakumar","doi":"10.1109/UKIWCWS.2009.5749386","DOIUrl":"https://doi.org/10.1109/UKIWCWS.2009.5749386","url":null,"abstract":"This paper presents a novel multiple access scheme for uplink of future mobile communications using MultiSymbol Encapsulated Orthogonal Frequency Division Multiplexing (MSE-OFDM). MSE-OFDM is a bandwidth efficient OFDM scheme, where a number of OFDM symbols are grouped together as a frame and protected by one single cyclic prefix (CP). This reduces the extent of redundancy caused by the CP and increases the bandwidth efficiency of the system. In the proposed scheme, a number of OFDM symbols from one user are grouped and one cyclic prefix is used for a group of symbols. Thus, we can get better spectral efficiency as compared to conventional OFDMA. The FFT size is also reduced, which improves the robustness to synchronization errors and reduces the PAPR.","PeriodicalId":198556,"journal":{"name":"2009 First UK-India International Workshop on Cognitive Wireless Systems (UKIWCWS)","volume":"99 12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128006732","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
Outage performance of two-way DF relaying with Alamouti transmissions and network coding 具有Alamouti传输和网络编码的双向DF中继的中断性能
2009 First UK-India International Workshop on Cognitive Wireless Systems (UKIWCWS) Pub Date : 2009-12-01 DOI: 10.1109/UKIWCWS.2009.5749417
P. K. Upadhyay, S. Prakriya
{"title":"Outage performance of two-way DF relaying with Alamouti transmissions and network coding","authors":"P. K. Upadhyay, S. Prakriya","doi":"10.1109/UKIWCWS.2009.5749417","DOIUrl":"https://doi.org/10.1109/UKIWCWS.2009.5749417","url":null,"abstract":"We investigate the outage performance of a two-phase two-way decode-and-forward (DF) relay channel in which each transceiver is equipped with two antennas, and uses the Alamouti orthogonal space-time block code (OSTBC) for transmission. The focus is on attaining good outage performance as enabled by the use of OSTBC transmissions in both phases, along with a low complexity near-optimum receiver in the first phase, and physical layer network coding (PNC) in the second phase. Assuming perfect channel state information at the receiver(s) in both phases, we derive expressions for the probability distribution functions of the signal-to-noise ratio (SNR) for all links in a Rayleigh flat-fading scenario. More precisely, we derive an exact expression of the outage probability for the end-to-end transmissions. The accuracy of the derived outage expression is verified by simulation results. We also demonstrate the impacts of channel asymmetry on the outage behavior. Numerical results show that the proposed scheme provides good performance under symmetric channel conditions.","PeriodicalId":198556,"journal":{"name":"2009 First UK-India International Workshop on Cognitive Wireless Systems (UKIWCWS)","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130813547","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
On hybrid power allocation scheme for OFDM based cognitive radio 基于OFDM的认知无线电混合功率分配方案研究
2009 First UK-India International Workshop on Cognitive Wireless Systems (UKIWCWS) Pub Date : 2009-12-01 DOI: 10.1109/UKIWCWS.2009.5749410
S. Malik, Adrish Banerjee
{"title":"On hybrid power allocation scheme for OFDM based cognitive radio","authors":"S. Malik, Adrish Banerjee","doi":"10.1109/UKIWCWS.2009.5749410","DOIUrl":"https://doi.org/10.1109/UKIWCWS.2009.5749410","url":null,"abstract":"In this paper we have considered a hybrid power allocation algorithm for OFDM based cognitive radio. In a centralized power allocation scheme there is a centralized controller that has information about available spectrum holes and each cognitive user's channel state information. However, the overhead involved is very high. In an de-centralized power allocation scheme each cognitive user allocates power to different subcarriers based on local information, however maximum achievable throughput is less compared to the centralized approach. In this paper we present a hybrid approach based on a centralized controller that does not require information about instantaneous channel gains of cognitive radio and distributed controllers. We show that maximum achievable transmission rate of our hybrid approach is very close to the case of centralized power allocation with full knowledge of instantaneous channel gains but at a substantially reduced overhead cost.","PeriodicalId":198556,"journal":{"name":"2009 First UK-India International Workshop on Cognitive Wireless Systems (UKIWCWS)","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131075368","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 mutual information of cognitive relay assisted Rayleigh fading MIMO channel 认知中继辅助瑞利衰落MIMO信道互信息研究
2009 First UK-India International Workshop on Cognitive Wireless Systems (UKIWCWS) Pub Date : 2009-12-01 DOI: 10.1109/UKIWCWS.2009.5749412
Md. Zahurul I. Sarkar, T. Ratnarajah, M. Sellathurai
{"title":"On the mutual information of cognitive relay assisted Rayleigh fading MIMO channel","authors":"Md. Zahurul I. Sarkar, T. Ratnarajah, M. Sellathurai","doi":"10.1109/UKIWCWS.2009.5749412","DOIUrl":"https://doi.org/10.1109/UKIWCWS.2009.5749412","url":null,"abstract":"In this paper, we study a Multiple-Input Multiple-Output (MIMO) communication scenario through Rayleigh fading cognitive radio channel in which two users, called the primary and the secondary users wish to communicate with two different receivers, in the presence of a cognitive relay. We assume that the secondary user transmits simultaneously with the primary user over the same channel instead of waiting for an idle channel which is traditional for a cognitive radio. The cognitive relay has access to the messages transmitted by both the users and assists them in communicating the messages successfully to their respective destinations. We address the problem of analyzing fading MIMO cognitive relay channels and derive the expressions for mutual information received at the primary and secondary receivers in both the cases when cognitive relay is present or not. We focus on the investigation of outage behavior of proposed model. Our results show that in the presence of cognitive relay, not only both the primary and secondary users are able to communicate with corresponding receivers compensating interferences created at their receivers, but also the outage performance of primary and secondary users are improved due to the additional diversity obtained via relaying.","PeriodicalId":198556,"journal":{"name":"2009 First UK-India International Workshop on Cognitive Wireless Systems (UKIWCWS)","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128456813","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
Power allocation under service-outage constraints for spectrum-sharing cognitive radio networks 频谱共享认知无线网络在服务中断约束下的功率分配
2009 First UK-India International Workshop on Cognitive Wireless Systems (UKIWCWS) Pub Date : 2009-12-01 DOI: 10.1109/UKIWCWS.2009.5749421
Leila Musavian, S. Lambotharan
{"title":"Power allocation under service-outage constraints for spectrum-sharing cognitive radio networks","authors":"Leila Musavian, S. Lambotharan","doi":"10.1109/UKIWCWS.2009.5749421","DOIUrl":"https://doi.org/10.1109/UKIWCWS.2009.5749421","url":null,"abstract":"A power allocation strategy is proposed for spectrum-sharing channels, in which two users share the spectrum band with one of them having a primary access to the band. The secondary user can utilize the spectrum as long as it complies with the service requirements of the primary user. Specifically, the latter allows the former to utilize the channel as long as its rate degradation as a results of the secondary user transmission is limited to a certain threshold with a predefined probability. The secondary and primary users employ truncated channel inversion with fixed rate (TIFR) transmission policy. We obtain the power allocation and capacity of the secondary user's link under joint secondary transmit power constraint and service-outage constraint imposed by the primary user. Numerical simulations are conducted to corroborate our theoretical results.","PeriodicalId":198556,"journal":{"name":"2009 First UK-India International Workshop on Cognitive Wireless Systems (UKIWCWS)","volume":"104 15","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120819033","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
SNDT: A genetic algorithm-based protocol selection tool for wireless network design SNDT:一种基于遗传算法的无线网络协议选择工具
2009 First UK-India International Workshop on Cognitive Wireless Systems (UKIWCWS) Pub Date : 2009-12-01 DOI: 10.1109/UKIWCWS.2009.5749424
Jin Fan, D. Parish
{"title":"SNDT: A genetic algorithm-based protocol selection tool for wireless network design","authors":"Jin Fan, D. Parish","doi":"10.1109/UKIWCWS.2009.5749424","DOIUrl":"https://doi.org/10.1109/UKIWCWS.2009.5749424","url":null,"abstract":"There is a growing need for tools that could help Wireless Network system designers in selection of different protocols before a practical network deployment. A Genetic Algorithm(GA)-based Sensor Network Design Tool(SNDT) is proposed in this work for wireless sensor network design in terms of performance, considering application-specific requirements, deployment constrains and energy characteristics. SNDT relies on offline simulation analysis to help resolve design decisions and could be applied to other types of wireless network. A GA is used as the optimization tool of the proposed system and an appropriate fitness function is derived to incorporate many aspects of network performance. The configuration attributes optimized by SNDT comprise the communication protocol selection and the number of nodes deployed in a fixed area.","PeriodicalId":198556,"journal":{"name":"2009 First UK-India International Workshop on Cognitive Wireless Systems (UKIWCWS)","volume":"167 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115977754","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
Spectrum sharing in multi-service cognitive network using reinforcement learning 基于强化学习的多服务认知网络频谱共享
2009 First UK-India International Workshop on Cognitive Wireless Systems (UKIWCWS) Pub Date : 2009-12-01 DOI: 10.1109/UKIWCWS.2009.5749427
A. Alsarhan, A. Agarwal
{"title":"Spectrum sharing in multi-service cognitive network using reinforcement learning","authors":"A. Alsarhan, A. Agarwal","doi":"10.1109/UKIWCWS.2009.5749427","DOIUrl":"https://doi.org/10.1109/UKIWCWS.2009.5749427","url":null,"abstract":"In this paper the issue of spectrum sharing in multi-service cognitive wireless network is addressed. The problem is formulated as a revenue maximization problem and a framework is presented that is capable of adequately solving a class of problem where resources are shared in radio environment. Primary users (PUs) exchange channels dynamically and based on the availability of idle channels at neighbors. Secondary users (SUs) of different classes form a mesh network and rent a spectrum from primary users. For such cognitive wireless mesh networks, the main challenge facing a PU is to satisfy the following conflicting objectives: maximizing its total revenue, maintaining its quality of service (QoS) (that degrades due to renting its spectrum to SUs) and reducing secondary user delay times. In this work machine learning paradigm is presented as a means for extracting the optimal control policy for spectrum sharing. To obtain different requirements, the objective function is defined to maximize the total revenue gained by primary users. Value iteration algorithm is applied to find an optimal control policy that maximizes the difference between reward and cost (revenue). Performance evaluation of the proposed spectrum sharing approach shows that the scheme is able to find an efficient trade-off between PUs revenue and SUs delay.","PeriodicalId":198556,"journal":{"name":"2009 First UK-India International Workshop on Cognitive Wireless Systems (UKIWCWS)","volume":"49 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116002816","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: 12
Network coding-based retransmission schemes for 4G multicast/broadcast networks with shared feedback channel 基于网络编码的4G多播/广播网络共享反馈信道重传方案
2009 First UK-India International Workshop on Cognitive Wireless Systems (UKIWCWS) Pub Date : 2009-12-01 DOI: 10.1109/UKIWCWS.2009.5749409
M. S. Zaman, N. Arulselvan
{"title":"Network coding-based retransmission schemes for 4G multicast/broadcast networks with shared feedback channel","authors":"M. S. Zaman, N. Arulselvan","doi":"10.1109/UKIWCWS.2009.5749409","DOIUrl":"https://doi.org/10.1109/UKIWCWS.2009.5749409","url":null,"abstract":"In this work we design retransmission schemes for broadcast networks which use simple network coding techniques. In particular we consider a wireless system with a shared feedback channel, wherein the number of transmission errors can be estimated by polling or voice-vote mechanisms. As a result, the feedback bandwidth is independent of the users in the system. We then develop analytical models to characterize error correction and employ these results to design efficient retransmission algorithms. We compare their performance with two baseline schemes.","PeriodicalId":198556,"journal":{"name":"2009 First UK-India International Workshop on Cognitive Wireless Systems (UKIWCWS)","volume":"48 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128162443","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
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