Fixed-complexity Sphere Encoder for Multi-user MIMO Systems

Autor:	Mohaisen, Manar, Chang, KyungHi
Rok vydání:	2011
Předmět:	Computer Science - Information Theory
Druh dokumentu:	Working Paper
Popis:	In this paper, we propose a fixed-complexity sphere encoder (FSE) for multi-user MIMO (MU-MIMO) systems. The proposed FSE accomplishes a scalable tradeoff between performance and complexity. Also, because it has a parallel tree-search structure, the proposed encoder can be easily pipelined, leading to a tremendous reduction in the precoding latency. The complexity of the proposed encoder is also analyzed, and we propose two techniques that reduce it. Simulation and analytical results demonstrate that in a 4 by 4 MU-MIMO system, the proposed FSE requires only 11.5% of the computational complexity needed by the conventional QRD-M encoder (QRDM-E). Also, the encoding throughput of the proposed encoder is 7.5 times that of the QRDM-E with tolerable degradation in the BER performance, while achieving the optimum diversity order. Comment: 7 pages, 7 figures. Accepted by Journal of Communications and Networks
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/1101.2249 Zobrazit plný text záznamu View this record from Arxiv