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Receivers for Spatially Multiplexed Space-Time Block Coded Systems : Reduced Complexity  

Hwang Hyeon Chyeol (인하대학교 전자공학과 통신공학연구실)
Shin Seung Hoon (인하대학교 UWB-ITRC)
Lee Cheol Jin (인하대학교 정보통신공학과 통신공학연구실)
Kwak Kyung Sup (인하대학교 정보통신학원)
Publication Information
The Journal of Korean Institute of Communications and Information Sciences / v.29, no.11A, 2004 , pp. 1244-1252 More about this Journal
Abstract
In this paper, we derive some properties of linear detectors (zero forcing or minimum mean square error) at spatial multiplexing systems with alamouti's space-time block code. Based on the derived properies, this paper proposes low-complexity receivers. Implementing MMSE detector adaptively, the number of weight vectors to be calculated and updated is greatly reduced with the derived properties compared to the conventional methods. In the case of recursive least square algorithm, with the proposed approach computational complexity is reduced to less than the half. We also identify that sorted QR decomposition detector, which reduces the complexity of V-Blast detector, has the same properties for unitary matrix Q and upper triangular matrix R. A complexity reduction of about 50%, for sorted QR decomposition detector, can be achieved by using those properties without the loss of performance.
Keywords
spatial multiplexing; space-time block coding; adaptive receiver; QR decomposition.;
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