Transceiver Design for Spatial Multiplexing Based on Prewhitening Detector

• Published in: IEEE transactions on vehicular technology 2009-03, Vol.58 (3), p.1345-1354
• Main Authors: Lingyang Song, Hjorungnes, A., Yahampath, P., Bhatnagar, M.R.
• Format: Article
• Language: English
• Subjects: Applied sciences; Circuit properties; Complexity; Decision feedback equalizers; Design engineering; Detection, estimation, filtering, equalization, prediction; Detectors; Downlink; Electric, optical and optoelectronic circuits; Electronic circuits; Electronics; Error analysis; Exact sciences and technology; Feedback; Frequency filters; Gaussian approximation; Information, signal and communications theory; Matched filters; Mathematical analysis; maximum likelihood (ML); MIMO; minimum mean square error decision feedback equalizer (MMSE-DFE); multiple-input multiple-output (MIMO); Multiplexing; precoder; preequalizer; Prewhitening; Radiocommunications; Signal and communications theory; Signal to noise ratio; Signal, noise; spatial multiplexing; Symbols; Telecommunications; Telecommunications and information theory; Transceivers; Transmitters; Transmitters. Receivers
• ISSN: 0018-9545; 1939-9359
• DOI: 10.1109/TVT.2008.924991

In this paper, we propose a joint-transmitter-and-receiver design for spatial multiplexing based on a novel prewhitening detector (PWD). By using decision feedback equalization (DFE), Gaussian approximation, a prewhitening filter, and a matched filter, the proposed PWD transforms the multiple-input-multiple-output (MIMO) system into several parallel single-input-single-output (SISO) schemes and facilitates single-symbol detection. The proposed scheme achieves near-optimal symbol recovery with a complexity similar to that of a minimum-mean-square-error decision feedback equalizer (MMSE-DFE). The closed-form symbol error rate (SER) of the PWD is derived, which can be used to closely predict the ML performance for uncoded V-BLAST schemes. By assuming full channel knowledge at the transmitter side, we use a preequalizer and a precoder in a downlink scenario. The preequalizer can transfer the feedback part of the DFE to the transmitter side and thus provide better performance in a low signal-to-noise ratio (SNR) with reduced receiver complexity. The precoder designed to minimize the SER of this system can further improve performance without affecting the complexity at the receiver side.