Wideband space-time communication with implicit channel feedback
作者： G. Barriac , U. Madhow
DOI: 10.1109/ISSPA.2003.1224681
关键词:
摘要: We consider wideband communication (e.g., using OFDM) over a typical cellular "downlink," in which the base station may have several antenna elements, while mobile has 1or 2 elements. The following are our major findings: (a) Implicit channel feedback regarding covariance matrix for downlink space-time can be obtained, without any power or bandwidth overhead, by suitably averaging uplink measurements across frequency. This approach applies to both time division duplex (TDD) and frequency (FDD) systems. used obtain better performance on downlink, at lower encoding decoding complexity, compared standard coding. (b) conventional design is space transmit antennas far enough apart so as ensure uncorrelated responses. However, when implicit available, much obtained significantly smaller spacing, optimized such that number of dominant eigenmodes matches (small) receive
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