DocumentCode :
2788636
Title :
Low complexity frequency domain equalization of MIMO channels with applications to MIMO-CDMA systems
Author :
Burg, A. ; Rupp, M. ; Haene, S. ; Perels, D. ; Felber, N. ; Fichtner, W.
Author_Institution :
IIS, ETH-Zurich, Zurich, Switzerland
Volume :
1
fYear :
2003
fDate :
6-9 Oct. 2003
Firstpage :
468
Abstract :
CDMA and MIMO-CDMA systems using RAKE receivers are heavily limited by self- and multiple-access-interference. Linear equalization is a means to remove this interference; however, it is often not practical due to the enormous complexity, especially in the MIMO case. The paper presents an approach to reduce greatly the complexity of linear MIMO equalizers. It discusses the complexity reduction of the equalizer itself and describes a suboptimal low-complexity method to compute its coefficients. The application of frequency domain equalization, using the overlap/add FFT method, to MIMO systems is suggested. The coefficients of the joint equalizer/MIMO detector are also derived in the frequency domain, based on an approximation of an MMSE criterion. Performance results in terms of BER are quantified through simulations of a MIMO-extended UMTS-FDD downlink.
Keywords :
3G mobile communication; MIMO systems; code division multiple access; computational complexity; equalisers; error statistics; fast Fourier transforms; frequency division multiplexing; frequency-domain analysis; least mean squares methods; radio receivers; radiofrequency interference; signal detection; BER; FFT; MIMO channels; MIMO detector; MIMO-CDMA systems; MMSE criterion; RAKE receivers; UMTS-FDD downlink; complexity reduction; frequency domain equalization; linear equalization; multiple-access-interference; overlap/add method; self-interference; Bit error rate; Detectors; Downlink; Equalizers; Fading; Frequency domain analysis; Interference; MIMO; Multiaccess communication; Multipath channels;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Vehicular Technology Conference, 2003. VTC 2003-Fall. 2003 IEEE 58th
ISSN :
1090-3038
Print_ISBN :
0-7803-7954-3
Type :
conf
DOI :
10.1109/VETECF.2003.1285061
Filename :
1285061
Link To Document :
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