Title :
Adaptive Multiuser Turbo Asynchronous Receiver for Oversaturated MIMO Communication System
Author :
Balasubramanyam, Ramkumar ; Rapajic, Predrag B.
Author_Institution :
Univ. of Greenwich at Medway, Chatham
Abstract :
In this paper we show that an adaptive multiuser Turbo (iterative) asynchronous compared to a synchronous receiver converges to the same bit error rate (BER) performance result of less than 10 3 at signal to interference noise ratio (SINR) greater than 4 dB . The (Turbo) iterative multiuser receiver system considered here consists of a bank of adaptive linear minimum mean square error (MMSE) channel estimator followed by non-linear MMSE detectors and a bank of dedicated log maximum a-posteriori (MAP) decoders. The log-MAP decoders and adaptive non-linear detectors which are separated by de-interleaver and interleaver, exchange imperfect decision information in every Turbo iteration. Asynchronous behavior of a wireless communication multicellular multiuser system (multiple input multiple output, MIMO) system is shown with different spreading gains but, fixed receiver filter tap size.
Keywords :
MIMO communication; adaptive codes; channel estimation; error statistics; iterative methods; least mean squares methods; maximum likelihood detection; mobile communication; multiuser channels; radio receivers; radiofrequency interference; turbo codes; BER performance; MAP decoders; adaptive linear estimator; adaptive multiuser turbo asynchronous receiver; bit error rate performance; imperfect decision information; maximum a-posteriori decoders; minimum mean square error channel estimator; multiple input multiple output system; non-linear MMSE detectors; oversaturated MIMO communication system; signal to interference noise ratio; wireless communication multicellular multiuser system; Bit error rate; Detectors; Filters; Interference; Iterative decoding; MIMO; Maximum a posteriori estimation; Mean square error methods; Signal to noise ratio; Wireless communication;
Conference_Titel :
Vehicular Technology Conference, 2006. VTC-2006 Fall. 2006 IEEE 64th
Conference_Location :
Montreal, Que.
Print_ISBN :
1-4244-0062-7
Electronic_ISBN :
1-4244-0063-5
DOI :
10.1109/VTCF.2006.306
