2012 Australian Communications Theory Workshop (AusCTW)最新文献

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Distributed transmit beamforming: Data funneling in wireless sensor networks 分布式发射波束形成:无线传感器网络中的数据漏斗
2012 Australian Communications Theory Workshop (AusCTW) Pub Date : 2012-03-09 DOI: 10.1109/AusCTW.2012.6164905
W. Tushar, David B. Smith, T. Lamahewa
{"title":"Distributed transmit beamforming: Data funneling in wireless sensor networks","authors":"W. Tushar, David B. Smith, T. Lamahewa","doi":"10.1109/AusCTW.2012.6164905","DOIUrl":"https://doi.org/10.1109/AusCTW.2012.6164905","url":null,"abstract":"In this paper, utilizing data funneling and distributed beamforming, we propose a novel cooperative cross-layer transmission scheme to reduce the transmit energy of sensor nodes while communicating over long distances in a wireless sensor network. We show that the proposed transmission scheme requires less transmit energy, compared to direct beamforming and direct single link transmission, to achieve the same symbol error probability (SEP) at the receiver. Considering battery energy consumption, we show that our proposed transmission scheme is capable of increasing the life time of sensor nodes that need to communicate over long distances. We also show improved performance in terms of a routing metric.","PeriodicalId":320391,"journal":{"name":"2012 Australian Communications Theory Workshop (AusCTW)","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-03-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132786442","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
A successive relaying protocol for a cooperative three-relay network 用于协作三中继网络的一种连续中继协议
2012 Australian Communications Theory Workshop (AusCTW) Pub Date : 2012-03-09 DOI: 10.1109/AusCTW.2012.6164909
Nayeema Sadeque, I. Land, R. Subramanian
{"title":"A successive relaying protocol for a cooperative three-relay network","authors":"Nayeema Sadeque, I. Land, R. Subramanian","doi":"10.1109/AusCTW.2012.6164909","DOIUrl":"https://doi.org/10.1109/AusCTW.2012.6164909","url":null,"abstract":"This paper proposes a relaying protocol for a network with three half-duplex relays. The protocol achieves full diversity of order three and full rate. This performance is achieved by means of cooperative successive-cancellation decoding followed by a sliding-window linear encoding scheme at the relays. The linear mapping at the relay encoder is designed to give an optimal constellation for the signals transmitted by the relays. The proposed scheme is shown to achieve full diversity when the relays are capable of decoding the original source symbols error free. The paper then proposes a selection-relaying approach capable of recovering full diversity even when the relay nodes decode erroneously. Simulation results confirm that the proposed relaying schemes indeed achieve the desired performance.","PeriodicalId":320391,"journal":{"name":"2012 Australian Communications Theory Workshop (AusCTW)","volume":"190 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-03-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132902399","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
Sidelobe suppression with orthogonal projection for OFDM systems 正交投影OFDM系统旁瓣抑制
2012 Australian Communications Theory Workshop (AusCTW) Pub Date : 2012-03-09 DOI: 10.1109/AusCTW.2012.6164903
A. Cantoni, J. Zhang, Xiaojing Huang, Y. Guo
{"title":"Sidelobe suppression with orthogonal projection for OFDM systems","authors":"A. Cantoni, J. Zhang, Xiaojing Huang, Y. Guo","doi":"10.1109/AusCTW.2012.6164903","DOIUrl":"https://doi.org/10.1109/AusCTW.2012.6164903","url":null,"abstract":"Sidelobe suppression, or out-of-band emission reduction, in OFDM systems can be achieved via time-domain windowing but this may result in significantly reduced spectrum efficiency. Alternatively, sidelobe cancellation and signal predistortion techniques have been proposed for spectrum shaping, but schemes achieving a good balance between complexity and performance are yet to be developed. In this paper, an efficient and low-complexity technique referred to as “sidelobe suppression with orthogonal projection” (SSOP) scheme is proposed. An analysis of the SNR performance and robustness characteristics of the proposed technique are also presented. Numerical results show that significant sidelobe suppression can be readily achieved with slight receiver performance degradation.","PeriodicalId":320391,"journal":{"name":"2012 Australian Communications Theory Workshop (AusCTW)","volume":"51 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-03-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124714613","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
Channel identification and its impact on quantum LDPC code performance 信道识别及其对量子LDPC码性能的影响
2012 Australian Communications Theory Workshop (AusCTW) Pub Date : 2012-02-02 DOI: 10.1109/AusCTW.2012.6164921
Yixuan Xie, Jun Yu Li, R. Malaney, Jinhong Yuan
{"title":"Channel identification and its impact on quantum LDPC code performance","authors":"Yixuan Xie, Jun Yu Li, R. Malaney, Jinhong Yuan","doi":"10.1109/AusCTW.2012.6164921","DOIUrl":"https://doi.org/10.1109/AusCTW.2012.6164921","url":null,"abstract":"In this work we probe the impact of channel estimation on the performance of quantum LDPC codes. Our channel estimation is based on an optimal estimate of the relevant decoherence parameter via its quantum Fisher information. Using state-of-the art quantum LDPC codes designed for the quantum depolarization channel, and utilizing various quantum probes with different entanglement properties, we show how the performance of such codes can deteriorate by an order of magnitude when optimal channel identification is fed into a belief propagation decoding algorithm. Our work highlights the importance in quantum communications of a viable channel identification campaign prior to decoding, and highlights the trade-off between entanglement consumption and quantum LDPC code performance.","PeriodicalId":320391,"journal":{"name":"2012 Australian Communications Theory Workshop (AusCTW)","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-02-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121984144","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
Outage minimization in cognitive radio networks with limited feedback 有限反馈认知无线电网络中中断最小化
2012 Australian Communications Theory Workshop (AusCTW) Pub Date : 2011-11-11 DOI: 10.1109/AusCTW.2012.6164911
Y. He, S. Dey
{"title":"Outage minimization in cognitive radio networks with limited feedback","authors":"Y. He, S. Dey","doi":"10.1109/AusCTW.2012.6164911","DOIUrl":"https://doi.org/10.1109/AusCTW.2012.6164911","url":null,"abstract":"We address an optimal transmit power allocation problem that minimizes the outage probability of a secondary user (SU) who is allowed to coexist with a primary user (PU) in a narrowband spectrum sharing cognitive radio network, under a long term average transmit power constraint at the secondary transmitter (SU-TX) and an average interference power constraint at the primary receiver (PU-RX), with quantized channel state information (CSI) (including both the channels from SU-TX to SU-RX, denoted as g1 and the channel from SU-TX to PU-RX, denoted as g0) at the SU-TX. The optimal quantization regions in the vector channel space is shown to have a `stepwise' structure. With this structure, the above outage minimization problem can be explicitly formulated and solved by employing the Karush-Kuhn-Tucker (KKT) necessary optimality conditions to obtain a locally optimal quantized power codebook. A low-complexity near-optimal quantized power allocation algorithm is derived for the case of large number of feedback bits. More interestingly, we show that as the number of partition regions approaches infinity, the length of interval between any two adjacent quantization thresholds on the g0 axis is asymptotically equal when the average interference power constraint is active. Similarly, we show that when the average interference power constraint is inactive, the ratio between any two adjacent quantization thresholds on the g1 axis becomes asymptotically identical. Finally, an explicit expression for the asymptotic SU outage probability at high rate quantization (as the number of feedback bits goes to infinity) is also provided, and is shown to approximate the optimal outage behavior extremely well for large number of bits of feedback via numerical simulations. Numerical results also illustrate that with 6 bits of feedback, the derived algorithms provide SU outage performance very close to that with full CSI at SU-TX.","PeriodicalId":320391,"journal":{"name":"2012 Australian Communications Theory Workshop (AusCTW)","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-11-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123955690","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
Location-aware cooperative spectrum sensing via Gaussian Processes 基于高斯过程的位置感知协同频谱感知
2012 Australian Communications Theory Workshop (AusCTW) Pub Date : 1900-01-01 DOI: 10.1109/AusCTW.2012.6164900
Ido Nevat, G. Peters, I. Collings
{"title":"Location-aware cooperative spectrum sensing via Gaussian Processes","authors":"Ido Nevat, G. Peters, I. Collings","doi":"10.1109/AusCTW.2012.6164900","DOIUrl":"https://doi.org/10.1109/AusCTW.2012.6164900","url":null,"abstract":"We present a new paradigm to perform spatial spectrum sensing in cooperative cognitive radio networks. In these networks, nodes cooperate to infer information on spectral and spatial occupancy. Following the recently proposed interference temperature metric, we formulate the problem via semi-parametric Gaussian Process modelling. This allows for a development of a flexible probabilistic framework to perform inference on a function space. Our methodology enables sensing spatial reusable zones, by means of a collaborative scheme to estimate the distribution of power emitted by the primary user in space. Hence, rather than a conventional binary decision process in space (busy/idle), our scheme provides a probabilistic spectrum access scheme for cognitive radio networks. We develop an algorithm, based on the Iterated Conditioning on the Modes (ICM) estimation to predict spatial spectral holes at any arbitrary spatial location. The ICM approach is computationally efficient, and suitable for real world applications. Numerical results demonstrate the benefits obtained by the proposed algorithm.","PeriodicalId":320391,"journal":{"name":"2012 Australian Communications Theory Workshop (AusCTW)","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123584823","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
Cross-layer design for spectrum sensing with selection diversity for cognitive radio systems 基于选择分集的认知无线电系统频谱感知跨层设计
2012 Australian Communications Theory Workshop (AusCTW) Pub Date : 1900-01-01 DOI: 10.1109/AusCTW.2012.6164919
Chang-Kyung Sung, I. Collings
{"title":"Cross-layer design for spectrum sensing with selection diversity for cognitive radio systems","authors":"Chang-Kyung Sung, I. Collings","doi":"10.1109/AusCTW.2012.6164919","DOIUrl":"https://doi.org/10.1109/AusCTW.2012.6164919","url":null,"abstract":"In this paper, we propose a new sensor node selection technique to improve spectrum sensing capability by jointly designing with a medium access layer protocol. As cognitive radio (CR) systems have no prior knowledge about the operation of the licensed network, cooperation between physical layer and medium access layer (MAC) is employed in this paper to keep track of operations of sensing nodes. To improve sensing performance, additional sensing nodes are deployed. The status of spectrum sensing at each user and each subband are maintained by finite state machine at the MAC layer. According to the state at CR nodes, the proposed scheme selects the dedicated sensing node for the channel with the best sensing performance. Numerical results show that the performance of the proposed scheme is almost the same as the cooperative spectrum sensing while our proposed scheme requires only one sensing node for the spectrum sensing.","PeriodicalId":320391,"journal":{"name":"2012 Australian Communications Theory Workshop (AusCTW)","volume":"62 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131494280","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: 0
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