Distributed Transmit Beamforming: Performance Improvement Using A Two-Bit Feedback Scheme

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Tushar, Wayes; Smith, David; Saad, Walid; Poor, H. Vincent


2012-10-02


Conference Material


International Symposium on Communications and Information Technologies


Gold Coast, Australia


5


In this paper a distributed transmit beamforming technique is proposed for time-varying wireless communication channels that improves the signal gain at the receiving terminal, and thus yielding an enhanced signal-to-interferenceplus-noise ratio. In this regard, a two-bit feedback algorithm, with considerable gains in terms of received signal strength (RSS), is proposed for optimizing the phase synchronization of signals beamformed from distributed transmitters towards a moving receiver. It is shown that the proposed scheme can successfully capture the impact of time-varying wireless channels on the transmitted signals with reasonable accuracy such that an improved RSS is achieved at the receiver. Numerical experiments show that the proposed two-bit feedback scheme achieves an improved average RSS of about 37:9% and 29:7%, relative to the existing one-bit scheme and the improved one-bit feedback scheme respectively. Results also show that the proposed scheme requires a significantly reduced number of antennas to achieve an RSS equivalent to that of the one-bit feedback schemes.


http://www.iscit2012.org/


nicta:6153


Tushar, Wayes; Smith, David; Saad, Walid; Poor, H. Vincent. Distributed Transmit Beamforming: Performance Improvement Using A Two-Bit Feedback Scheme.[Conference Material]. 2012-10-02. <a href="http://hdl.handle.net/102.100.100/99272?index=1" target="_blank">http://hdl.handle.net/102.100.100/99272?index=1</a>



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