2011 International ITG Workshop on Smart Antennas最新文献

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On a rate region approximation of MIMO channels under partial CSI 部分CSI下MIMO信道的速率域近似
2011 International ITG Workshop on Smart Antennas Pub Date : 2011-04-05 DOI: 10.1109/WSA.2011.5741953
A. Pastore, M. Joham, J. Fonollosa
{"title":"On a rate region approximation of MIMO channels under partial CSI","authors":"A. Pastore, M. Joham, J. Fonollosa","doi":"10.1109/WSA.2011.5741953","DOIUrl":"https://doi.org/10.1109/WSA.2011.5741953","url":null,"abstract":"When the receiver of a multiple-input multiple-output (MIMO) channel does not know the channel state, but only a linear estimate thereof, the rates achieved with (suboptimal) Gaussian codebooks become difficult to compute. However, one can resort to upper and lower bounds known from literature. Extending the ideas of earlier works on the resource allocation (time and energy) between pilot and data symbols, we first show that, at high SNR, the optimal training length is min(M,N) (where M and N are the number of receive and transmit antennas), and that in no case more than half the coherence time should be used for training. By simple arguments, we show that the basic training scheme—which allocates separate time slots for training and data transmission—achieves the diversity-multiplexing tradeoff of block-fading channels. In a second part, we propose a generalization of the mutual information bounds to inner and outer rate region bounds of the multiple-access channel.","PeriodicalId":307097,"journal":{"name":"2011 International ITG Workshop on Smart Antennas","volume":"119 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125240716","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
Optimized capacity bounds for the half-duplex Gaussian MIMO relay channel 半双工高斯MIMO中继信道的优化容量边界
2011 International ITG Workshop on Smart Antennas Pub Date : 2011-04-05 DOI: 10.1109/WSA.2011.5741927
Lennart Gerdes, W. Utschick
{"title":"Optimized capacity bounds for the half-duplex Gaussian MIMO relay channel","authors":"Lennart Gerdes, W. Utschick","doi":"10.1109/WSA.2011.5741927","DOIUrl":"https://doi.org/10.1109/WSA.2011.5741927","url":null,"abstract":"In this paper, the optimization of the cut-set bound (CSB) and the achievable decode-and-forward (DF) rate for the half-duplex Gaussian multiple-input multiple-output (MIMO) relay channel is considered. In particular, it is shown that evaluating the cut-set bound and the maximal achievable DF rate is equivalent to solving convex optimization problems if perfect channel state information (CSI) is available at all nodes. Our work therefore extends results for the full-duplex relay channel, which we also revisit here, and it demonstrates that it is possible to efficiently determine (generally loose) bounds on the capacity of the half-duplex MIMO relay channel.","PeriodicalId":307097,"journal":{"name":"2011 International ITG Workshop on Smart Antennas","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123676882","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
Closed-form blind channel estimation for orthogonally coded MIMO-OFDM systems: An algorithm and uniqueness study 正交编码MIMO-OFDM系统的闭式盲信道估计:一种算法及唯一性研究
2011 International ITG Workshop on Smart Antennas Pub Date : 2011-04-05 DOI: 10.1109/WSA.2011.5741941
Nima Sarmadi, M. Pesavento, A. Gershman
{"title":"Closed-form blind channel estimation for orthogonally coded MIMO-OFDM systems: An algorithm and uniqueness study","authors":"Nima Sarmadi, M. Pesavento, A. Gershman","doi":"10.1109/WSA.2011.5741941","DOIUrl":"https://doi.org/10.1109/WSA.2011.5741941","url":null,"abstract":"In this paper, a new blind channel estimator for multiple-input multiple-output orthogonal frequency-division multiplexing (MIMO-OFDM) systems is proposed. Based on the properties of the underlying orthogonal space-time block code (OSTBC), a novel subspace model is devised. The proposed technique consists in a closed-form approach in which the channels are estimated from the principal eigenvector of an extended sample covariance matrix of the received data. It is capable to take advantage of the finite delay spread assumption of the channel to estimate a lower number of channel parameters in the time rather than in the frequency domain. The coherent processing across all the subcarriers not only yields a considerable noise reduction and improved estimation accuracy, but also guarantees uniqueness of the channel estimates under certain conditions and offers a substantially reduced computational complexity.","PeriodicalId":307097,"journal":{"name":"2011 International ITG Workshop on Smart Antennas","volume":"43 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124751376","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
Cooperative beamforming for multiple multicast groups over multiple resource blocks 多资源块上多组播组的协同波束形成
2011 International ITG Workshop on Smart Antennas Pub Date : 2011-04-05 DOI: 10.1109/WSA.2011.5741952
J. Huschke, S. Kisseleff
{"title":"Cooperative beamforming for multiple multicast groups over multiple resource blocks","authors":"J. Huschke, S. Kisseleff","doi":"10.1109/WSA.2011.5741952","DOIUrl":"https://doi.org/10.1109/WSA.2011.5741952","url":null,"abstract":"We consider beamforming for multicasting the same data from a single or cooperatively from multiple base stations (BS) to several user equipments (UE). BSs have uncorrelated antennas. Beamforming can be applied separately for each physical layer resource block (PRB) of 180kHz bandwidth. The channel is almost flat within a PRB but frequency selective across the PRBs within the system bandwidth. FEC extends over the entire system bandwidth. For each UE a metric of aggregate per-PRB SINR is calculated. The beamforming goal is to maximize the minimum metric of all UEs. Two algorithms for determining the beamforming weights are considered, one iterative algorithm based on signal and interference gradients and an algorithm based on semidefinite relaxation (SDR). Performance evaluation employs a 3GPP network deployment and channel models. Results show that the gradient based algorithm outperforms SDR in the single BS scenario. In the cooperative multi-BS scenario the SDR algorithm performs better.","PeriodicalId":307097,"journal":{"name":"2011 International ITG Workshop on Smart Antennas","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131535242","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
A wideband beamformer with interference and noise suppression capabilities employing only spatial signal processing 仅采用空间信号处理的具有干扰和噪声抑制能力的宽带波束形成器
2011 International ITG Workshop on Smart Antennas Pub Date : 2011-04-05 DOI: 10.1109/WSA.2011.5741920
Mariel Rivas, Shuguo Xie, D. Su
{"title":"A wideband beamformer with interference and noise suppression capabilities employing only spatial signal processing","authors":"Mariel Rivas, Shuguo Xie, D. Su","doi":"10.1109/WSA.2011.5741920","DOIUrl":"https://doi.org/10.1109/WSA.2011.5741920","url":null,"abstract":"This paper presents an adaptive beamformer for smart antennas, which is able to steer its main beam and nulls in azimuth over a wide frequency band, without tape delay lines or frequency filters. This is achieved based on fully spatial signal processing techniques wherein a two-dimensional antenna array operates as a spatial filter, processing the received signals with only weighting schemes. Previous weighting schemes algorithms are not capable of working properly in a noisy environment. However, in this paper, a second order Kalman filter is employed to efficiently synthesize the radiation patterns in a noisy environment.","PeriodicalId":307097,"journal":{"name":"2011 International ITG Workshop on Smart Antennas","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114625426","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
Spatial shaping in cognitive system with coded legacy transmission 具有编码遗传传递的认知系统的空间塑造
2011 International ITG Workshop on Smart Antennas Pub Date : 2011-04-05 DOI: 10.1109/WSA.2011.5741949
Jing Lv, Eduard Axel Jorswieck
{"title":"Spatial shaping in cognitive system with coded legacy transmission","authors":"Jing Lv, Eduard Axel Jorswieck","doi":"10.1109/WSA.2011.5741949","DOIUrl":"https://doi.org/10.1109/WSA.2011.5741949","url":null,"abstract":"We consider the coexistence of a secondary user with a single-antenna primary link which is not fully loaded. The secondary user has multiple antennas and performs spatial shaping. First we consider the case when single-user decoding is deployed at the cognitive receiver. By spatial shaping, the secondary user can optimize its achievable rate under the rate constraint of the primary user, and a closed-form solution is derived. Then we study the case when successive decoding is viable at the cognitive receiver and rate splitting is applied at the cognitive transmitter. In both cases the cognitive transmitter can operate at its full power. Both theoretical analysis and simulation results show that spatial shaping with single-user decoding converges to maximum ratio transmission (MRT) as the primary link approaches null load, and converges to zero forcing (ZF) as the primary link approaches full load. When successive decoding is viable, rate splitting increases the cognitive rate compared to single-user decoding. Finally, we discuss the control signaling needed to perform spatial shaping in cognitive system with legacy transmission.","PeriodicalId":307097,"journal":{"name":"2011 International ITG Workshop on Smart Antennas","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130300470","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
On multistreaming with compact antenna arrays 紧凑型天线阵列的多流技术
2011 International ITG Workshop on Smart Antennas Pub Date : 2011-04-05 DOI: 10.1109/WSA.2011.5741932
M. Ivrlac, J. Nossek
{"title":"On multistreaming with compact antenna arrays","authors":"M. Ivrlac, J. Nossek","doi":"10.1109/WSA.2011.5741932","DOIUrl":"https://doi.org/10.1109/WSA.2011.5741932","url":null,"abstract":"We investigate the capability of compact antenna arrays to support the simultaneous transfer of several independent data streams over the same band of frequencies. It is shown that the near-field interaction of the closely spaced antennas inside the arrays accounts for a surprisingly good multistreaming capability, even for extremely compact arrays. This result is demonstrated for the case of a 2 × 2 system of thin half-wavelength dipoles in a multipath environment provided by two perfectly conducting reflector plates, and isotropic background noise. Decoupling/power-matching and decoupling/noise-matching networks are applied at the transmit side and the receive side arrays, respectively. The analysis is based on a circuit theoretic multiport model of the system which captures all relevant physics of antenna mutual coupling, the influence of the matching networks, and noise. It is shown that in the absence of heat loss in the matching networks and antenna wires, the simultaneous transfer of two data streams can work perfectly well even as the separation between the antennas inside the arrays approaches zero.","PeriodicalId":307097,"journal":{"name":"2011 International ITG Workshop on Smart Antennas","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128957116","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
Iterative interference alignment for cellular systems 蜂窝系统的迭代干扰对准
2011 International ITG Workshop on Smart Antennas Pub Date : 2011-04-05 DOI: 10.1109/WSA.2011.5741950
J. Schreck, G. Wunder
{"title":"Iterative interference alignment for cellular systems","authors":"J. Schreck, G. Wunder","doi":"10.1109/WSA.2011.5741950","DOIUrl":"https://doi.org/10.1109/WSA.2011.5741950","url":null,"abstract":"The degrees of freedom of a cellular system in a fading environment are determined. An arbitrary number of base stations with multiple antennas and an arbitrary, but similar per cell, number of users with multiple antennas is considered. Two distributed algorithms which possibly achieve interference alignment are presented. Simulations show that the proposed algorithms achieve the optimal degrees of freedom.","PeriodicalId":307097,"journal":{"name":"2011 International ITG Workshop on Smart Antennas","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130854613","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: 27
Modeling and minimization of transceiver power consumption in wireless networks 无线网络中收发器功耗的建模与最小化
2011 International ITG Workshop on Smart Antennas Pub Date : 2011-04-05 DOI: 10.1109/WSA.2011.5741951
A. Mezghani, J. Nossek
{"title":"Modeling and minimization of transceiver power consumption in wireless networks","authors":"A. Mezghani, J. Nossek","doi":"10.1109/WSA.2011.5741951","DOIUrl":"https://doi.org/10.1109/WSA.2011.5741951","url":null,"abstract":"The minimization of the overall power consumption of wireless networks while satisfying a certain throughput and error rate constraint is investigated. The total power dissipation includes the radiated power as well as the circuit power consumption. In the context of battery operated short range communication, where low power, low cost and small size are key requirements (e.g. standard IEEE 802.15.4), this circuit aware system optimization is crucial given the growing importance of “Green Communication”. In fact, the power dissipation of certain analog and digital components along the signal path reaches values in the order of or is even higher than the transmit power in such applications. Using an appropriate information-theoretic framework and a simplified wireless network model, we derive the optimal frequency reuse distance, the optimal bit-resolution of the analog-to-digital converter (ADC), the optimal choice of the noise figure for the low noise amplifier (LNA), the optimal operating input back-off (IBO) of the power amplifier (PA), as well as the optimum decoding (DEC) strategy as a function of the path-loss (i.e. the communication distance), that guarantee a certain area spectral efficiency ρ under a certain error probability Pe. This work is an extension to the work [1], [2], [3], where a noisy single user channel was assumed.","PeriodicalId":307097,"journal":{"name":"2011 International ITG Workshop on Smart Antennas","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126255476","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: 40
Spatial diversity impact on the local delay of homogeneous and clustered wireless networks 空间分集对同质和集群无线网络局部时延的影响
2011 International ITG Workshop on Smart Antennas Pub Date : 2011-04-05 DOI: 10.1109/WSA.2011.5741937
G. Alfano, R. Tresch, M. Guillaud
{"title":"Spatial diversity impact on the local delay of homogeneous and clustered wireless networks","authors":"G. Alfano, R. Tresch, M. Guillaud","doi":"10.1109/WSA.2011.5741937","DOIUrl":"https://doi.org/10.1109/WSA.2011.5741937","url":null,"abstract":"The law of the time to transmit a packet from a node to its intended receiver, in a wireless network with randomly deployed, multiple-antennas equipped nodes, whose communication is impaired by fading and interference, is investigated. SINR-based coverage at the physical layer is assumed, and the useful signal strength is shaped through either cooperative or non-cooperative beamforming. In particular, two rate-optimizing strategies are exploited, i.e. dominant eigenmode transmission (DET) and interference alignment (IA). The MAC is governed by spatial ALOHA with prescribed medium access probability. The rationale of the work stems from the fact that even in the case of observed individual (per-node) finite-mean random geometric delay (which implies a non-vanishing next-hop throughput) the large population average of such delay may be unbounded in several cases of practical interest. Both the case of homogeneous Poisson point process as well as of clustered Poisson are analyzed, providing monotonicity results on the average local delay achievable under a set of common assumptions on the communication scenario, and varying the number of spatial degrees of freedom available for transmit beamforming and/or interference suppression.","PeriodicalId":307097,"journal":{"name":"2011 International ITG Workshop on Smart Antennas","volume":"53 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124935624","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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