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Capacity analysis of transmit beamforming with variable feedback delay
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作者 Lei Zhu Yong Xiong Xiumei Yang 《Journal of Systems Engineering and Electronics》 SCIE EI CSCD 2012年第1期24-31,共8页
The feedback delay can severely affect the quality of the channel state information at the transmitter (CSIT) which is fed back from the receiver. The outdated CSIT will cause large performance loss in the transmit ... The feedback delay can severely affect the quality of the channel state information at the transmitter (CSIT) which is fed back from the receiver. The outdated CSIT will cause large performance loss in the transmit beamforming systems. The effect of variable feedback delay on the capacity of transmit beamforming systems over Rayleigh fading channels is studied. First, the case of fixed feedback delay is considered and a closed-form expression of system capacity is derived. Based on the results of fixed delay, the delay following certain distributions in variable delay case is assumed and the closed-form expressions of capacities are derived. The closed-form expressions show that the capacity is significantly affected by the statistical characteristics of the feedback delay. The obtained results provide an analytical insight into the effects caused by variable delay on the system capacity. 展开更多
关键词 multiple input single output capacity feedback delay transmit beamforming (TB).
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Hierarchical space–time block codes signals classification using higher order cumulants 被引量:10
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作者 Ling Qing Zhang Limin +1 位作者 Yan Wenjun Kong Dongming 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2016年第3期754-762,共9页
An efficient method for blind classification of space time block codes (STBCs) based on fourth-order cumulants is proposed for a single receiver antenna. This paper presents a model of received STBCs signals in mult... An efficient method for blind classification of space time block codes (STBCs) based on fourth-order cumulants is proposed for a single receiver antenna. This paper presents a model of received STBCs signals in multiple input single output (MISO) communication systems and applies the characteristics of coding matrices to derive analytical expressions for the fourth-order cumu- lants to be used as the basis of an algorithm. The fourth-order cumulants at various delay vectors present non-null values that depend on the transmitted STBCs. Tests of nullity are accomplished by hypothesis testing. The proposed algorithm avoids the need for a priori information of modulation scheme, channel coefficients, and noise power. Consequently, it is well suited for non-cooperative scenarios. Simulations show that this method performs well even at low signal-to-noise ratios (SNRs). 展开更多
关键词 Blind classification Fourth-order cumulants multiple input single output Non-cooperative context STBCs
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