Blind and semi-blind equalization for generalized space-time block codes

Authors:
A.L. Swindlehurst;G. Leus
Affiliations:
Dept. of Electr. & Comput. Eng., Brigham Young Univ., Provo, UT;-
Venue:
IEEE Transactions on Signal Processing
Year:
2002

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Abstract

This paper presents a general framework for space-time codes (STCs) that encompasses a number of previously proposed STC schemes as special cases. The STCs considered are block codes that employ arbitrary redundant linear precoding of a given data sequence together with embedded training symbols, if any. The redundancy introduced by the linear precoding imposes structure on the received data that under certain conditions can be exploited for blind or semi-blind estimation of the transmitted sequence, a linear receiver that recovers the sequence, or both simultaneously. Algorithms based on this observation are developed for the single-user flat-fading case and then extended to handle multiple users, frequency-selective fading, as well as situations where the channel is rank deficient, or there are fewer receive than transmit antennas.