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This paper presents a new space-time two-stage receiver with the assistance of soft information for the Alamouti space-time block code (STBC) and spatially multiplexing (SM) combined systems. The first stage of the receiver consists of a set of soft generalized sidelobe canceller (GSC)-based detectors, each for every STBC group and is intended to yield a more precise initial estimate of the transmitted...
The Golden code has been proposed as an optimal space-time code for multiple-input multiple-output (MIMO) communication systems. This paper considers a ??blind?? MIMO system where the channel is assumed to be unknown. The Golden code is unidentifiable under this condition and can not be used directly. A block code modification is described which makes the Golden code usable in the context of blind...
We present a new iterative symbol detection and decoding scheme for coded V-BLAST architectures (ISDD-BLAST). In this scheme, V-BLAST blocks are spatially encoded using a short block code. Using a Tanner graph representation of the code's parity-check matrix, as each symbol is detected, the detector is able to determine when an error has occurred. The detector then uses a modified bit-flipping algorithm...
We present a new approach to blind equalization for generalized orthogonal space-time block codes. Our method takes the form of linear programming (LP) and is globally convergent. We exploit the implicit structure of orthogonal space-time block codes to cast the problem as linear programming that can be solved efficiently. Unlike several known methods, the proposed technique is applicable to many...
Joint channel-symbol estimation has been recently applied to a differential unitary space-time coded Multiple Input Multiple Output (MIMO) system in order to reduce the SNR penalty of differential encoding relative to coherent communications. Using unitary codes restricts the data rate to one symbol per channel use. A block differential MIMO technique was presented in which allows the use of non-orthogonal...
Recently, we reported a low-complexity likelihood ascent search (LAS) detection algorithm for large MIMO systems with several tens of antennas that can achieve high spectral efficiencies of the order of tens to hundreds of bps/Hz. Through simulations, we showed that this algorithm achieves increasingly near SISO AWGN performance for increasing number of antennas in i.i.d. Rayleigh fading. However,...
In this paper, we propose a robust STBC transmission scheme to combat the timing synchronization errors over frequency-selective multiple-access channels. First, the equivalent channel model in the presence of timing synchronization errors is derived and we find that the synchronization errors result in an equivalent channel model with larger number of correlated channel taps. Based on this correlated...
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