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Bit-Error Rate Evaluation of V-BLAST Receivers Using Limited-Precision QR Decomposition

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3 Author(s)
Bazdresch, M. ; Dept. of Electron., Syst. & Comput. Sci., ITESO, Jalisco ; Cortez, J. ; Torres, D.

This paper describes the behavior of two popular thin-QR decomposition algorithms when implemented using fixed-point arithmetic. This behavior is studied in the context of a V-BLAST receiver, and the effects of the limited precision are evaluated in terms of their impact on the receiver's bit error rate. Our analysis of V-BLAST under these conditions shows a strong dependence on the numerical precision, for both the integer and fractional parts. We have also identified an "error floor" effect, where the bit error rate reaches a limit and stops improving even if the precision is increased. In addition, we have determined the minimum fixed-point word size required not to adversely impact performance for a variety of antenna array sizes

Published in:

Electrical and Electronics Engineering, 2006 3rd International Conference on

Date of Conference:

6-8 Sept. 2006