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This paper introduces an efficient multiple-decision-feedback (MDF) detection for space time block code (STBC) over time-selective fading channels. The MDF detection performs several decision-feedback (DF) detections for the most probable points obtained by a log-likelihood ratio (LLR) based bit flipping scheme. Simulation results show that, with reasonable complexity, the MDF detection provides near...
In 1974, BCJR algorithm[l] was invented for maximum a posteriori (MAP) decoding of error correcting codes defined on trellises. In this paper, we apply BCJR algorithm to the detector for coded multiple-input multiple-output (MIMO) system to achieve high detection performance. With known channel information, coded MIMO detector can compute log- likelihood ratio (LLR) on the channel trellis by BCJR...
Near maximum-likelihood(ML) detections with reduced complexity are promising techniques for coded multiple- input multiple-output (MIMO) systems. Particularly, the QRM- MLD algorithm is often considered in practical applications since it can easily control receiver's complexity. However, it provides inaccurate log likelihood ratio (LLR) values due to the limited number of candidate symbol vectors...
This paper presents a new double space-time transmit diversity (DSTTD) transceiver exploiting the special structure of the channel matrix. This accounts for accomplishing very low complexity maximum-likelihood (ML) detector. First, the proposed ML detector requires significantly fewer computations than that of the Schnorr-Euchner sphere decoding (SE-SD) algorithm in respective of both the worst-case...
This paper presents a reduced-complexity QRD- M algorithm using partial decision feedback (DF) detection. Adaptive QRD-M algorithm obtains the threshold value through the simulation to prune off paths at each stage. However, the proposed algorithm efficiently acquires the threshold value using partial DF detection at each stage. In 4 times 4 V-BLAST system with 16-QAM, the complexity of the proposed...
We investigate closed-form bit error rate (BER) expressions for the double space-time transmit diversity (DSTTD) system with a zero-forcing decision-feedback (ZF-DF) detector. We show that the lower Alamouti's STTD unit can obtain the second order diversity gain. However, the upper one cannot guarantee the fourth order diversity due to the effect of error propagation. For example, it simply gives...
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