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Approaching Near-Capacity on a Multi-Antenna Channel using Successive Decoding and Interference Cancellation Receivers  

Sellathurai, Mathini (Communications Research Centre)
Guinand, Paul (Communications Research Centre)
Lodge, John (Communications Research Centre)
Publication Information
Abstract
In this paper, we address the problem of designing multirate codes for a multiple-input and multiple-output (MIMO) system by restricting the receiver to be a successive decoding and interference cancellation type, when each of the antennas is encoded independently. Furthermore, it is assumed that the receiver knows the instantaneous fading channel states but the transmitter does not have access to them. It is well known that, in theory, minimummean- square error (MMSE) based successive decoding of multiple access (in multi-user communications) and MIMO channels achieves the total channel capacity. However, for this scheme to perform optimally, the optimal rates of each antenna (per-antenna rates) must be known at the transmitter. We show that the optimal per-antenna rates at the transmitter can be estimated using only the statistical characteristics of the MIMO channel in time-varying Rayleigh MIMO channel environments. Based on the results, multirate codes are designed using punctured turbo codes for a horizontal codedMIMOsystem. Simulation results show performances within about one to two dBs of MIMO channel capacity.
Keywords
Multiple-input multiple-output (MIMO); turbo codes; successive decoding; interference cancellation; per-antenna rates; multirate coding; minimum-mean-square error (MMSE);
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Times Cited By Web Of Science : 4  (Related Records In Web of Science)
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