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Bandwidth Efficient Variable Rate HARQ Under Orthogonal Space-Time Block Codes | IEEE Journals & Magazine | IEEE Xplore

Bandwidth Efficient Variable Rate HARQ Under Orthogonal Space-Time Block Codes


Abstract:

We propose a bandwidth and power efficient hybrid Automatic Repeat reQuest (HARQ) transceiver system that preserves full retransmission diversity under orthogonal space-t...Show More

Abstract:

We propose a bandwidth and power efficient hybrid Automatic Repeat reQuest (HARQ) transceiver system that preserves full retransmission diversity under orthogonal space-time block codes (OSTBC) with low decoding complexity. This new HARQ scheme is built upon traditional OSTBC transmission to achieve full space-time diversity. During retransmissions upon packet losses, space-time encoding can be compressed in time to reduce bandwidth utility and achieve joint detection of multiple transmissions without training. By formulating the joint detection model at the receiver into a Quasi-Orthogonal Space-Time transmission, we can achieve the dual objectives of bandwidth reduction and full transmission diversity. Unlike traditional full ARQ retransmission, our proposed receiver can also apply joint semi-blind channel estimation by omitting training during retransmission to further improve bandwidth efficiency.
Published in: IEEE Transactions on Signal Processing ( Volume: 62, Issue: 13, July 2014)
Page(s): 3360 - 3370
Date of Publication: 30 May 2014

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