Effect of Word-length Precision on the Performance of MIMO Systems

Abstract—In this paper, we investigate the effect of quantization noise and roundoff errors involved in finite-precision (FP) signal processing on the performance of multiple-input multipleoutput (MIMO) receivers under flat-fading channel conditions. We simulated the performance degradation with FP for six transmission schemes, namely the Alamouti transmit diversity scheme, Spatial Multiplexing (SM) under maximum-likelihood (ML) detection, SM under Ordered Successive Interference Cancellation (OSIC) for (¢¤£¥¢ ) MIMO, Orthogonal Space-Time Block Code (STBC), Quasi-Orthogonal STBC for (¦§£¨¢ ) MIMO and interference cancellation with two (¢¤£©¢ ) Alamouti scheme. We also provide a procedure to analyze roundoff errors in FP MIMO receivers and quantify the effective decision-point SNR. The quantified variance of accumulated quantization noise and decision-point SNR for FP Alamouti Scheme corroborates the simulation result. Finally, we provide the minimum word-length pre...

• Type: Conference
• Year: 2007
• Where: ISCAS
• Authors: Chitranjan K. Singh, Naofal Al-Dhahir, Poras T. Balsara
• Keywords: FP MIMO Receivers, Interference Cancellation, ISCAS 2007, Quantization Noise