Capacity-approaching rate function for layered multiantenna architectures

Citació

  • Capacity-approaching rate function for layered multiantenna architectures. IEEE Transactions on Wireless Communications. 2003; 2(4): 616-620. DOI 10.1109/TWC.2003.814330

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  • Resum

    The simultaneous use of multiple transmit and receive antennas can unleash very large capacity increases in rich multipath environments. Although such capacities can be approached by layered multi-antenna architectures with per-antenna rate control, the need for short-term feedback arises as a potential impediment, in particular as the number of antennas—and thus the number of rates to be controlled—increases. What we show, however, is that the need for short-term feedback in fact vanishes as the number of antennas and/or the diversity order increases. Specifically, the rate supported by each transmit antenna becomes deterministic and a sole function of the signal-to-noise, the ratio of transmit and receive antennas, and the decoding order, all of which are either fixed or slowly varying. More generally, we illustrate -through this specific derivation— /nthe relevance of some established random CDMA results to the single-user multi-antenna problem.
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