Soft-input soft-output single tree-search sphere decoding


Christoph Studer and Helmut Bölcskei


IEEE Transactions on Information Theory, Vol. 56, No. 10, pp. 4827-4842, Oct. 2010.

DOI: 10.1109/TIT.2010.2059730

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Soft-input soft-output (SISO) detection algorithms form the basis for iterative decoding. The computational complexity of SISO detection often poses significant challenges for practical receiver implementations, in particular in the context of multiple-input multiple-output (MIMO) wireless communication systems. In this paper, we present a low-complexity SISO sphere-decoding algorithm, based on the single tree-search paradigm proposed originally for soft-output MIMO detection in Studer, et al., IEEE J-SAC, 2008. The new algorithm incorporates clipping of the extrinsic log-likelihood ratios (LLRs) into the tree-search, which results in significant complexity savings and allows to cover a large performance/complexity tradeoff region by adjusting a single parameter. Furthermore, we propose a new method for correcting approximate LLRs---resulting from sub-optimal detectors---which (often significantly) improves detection performance at low additional computational complexity.


Multiple-input multiple-output (MIMO) communication, soft-input soft-output detection, sphere decoding, iterative MIMO decoding


A software package containing the code of the SISO STS-SD algorithm as well as a complete Monte-Carlo MIMO-OFDM simulation environment can be downloaded here.

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