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Layered Receivers for System Combined Layered Space-Time Processing and Space-Time Trellis Codes  

임은정 (연세대학교 전기전자공학과)
김동구 (연세대학교 전기전자공학과)
Publication Information
Journal of the Institute of Electronics Engineers of Korea TC / v.41, no.3, 2004 , pp. 9-14 More about this Journal
Abstract
The system combined layered space-time processing and space-time trellis codes (STTC) provide high transmission rate as well as diversity and coding gain without bandwidth expansion. In this paper, two layered receiver structures are proposed. One is the LSTT-MMSE in which received bit streams are decoupled by interference nulling and then decoded by separate STTC decoders. The decoded outputs are cancelled from the received signal before advancing to the next layer detection. The other is LSTT-Whitening employing whitening rather than nulling. The receiver employing whitening process shows several advantages on diversity gain and the required number of receive antennas compare to the convolutional coded space-time processing. The proposed receivers use different decoding order scheme according to each interference suwression. The (4, 3) LSTT-Whitening receiver still achieves 1㏈ gain over the (4, 4) LSTT-MMSE and the (4, 4) coded layered space-time processing.
Keywords
MIMO; space-time trellis code; MMSE, whitening process; decoding order;
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