A Study on Spatial MMSE Despreading for OSTSTD in a Fast Fading Channel

Shinsuke TAKAOKA  Fumiyuki ADACHI  

IEICE TRANSACTIONS on Communications   Vol.E89-B   No.8   pp.2266-2270
Publication Date: 2006/08/01
Online ISSN: 1745-1345
DOI: 10.1093/ietcom/e89-b.8.2266
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Terrestrial Radio Communications
OSTSTD,  spatial MMSE despreading,  fast fading,  

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Spatial despreading weight based on minimum mean square error (MMSE) criterion is derived for orthogonal space-time spreading transmit diversity (OSTSTD) in a fast fading channel, taking into account the inter-antenna interference (IAI) and the inter-code interference (ICI) caused by orthogonality distortion of time-domain spreading codes. Average bit error rate (BER) performance is theoretically analyzed and confirmed by computer simulation to show that the diversity gain can be obtained even in a fast fading.