期刊名称：International Journal of Electronics Communication and Computer Engineering
印刷版ISSN：2249-071X
电子版ISSN：2278-4209
出版年度：2013
卷号：4
期号：5
页码：1527-1531
出版社：IJECCE
摘要：Multiple Input-Multiple Output (MIMO) systems uses multiple antennas at the transmitter and the receiver to achieve high spectral efficiency. Sphere decoder (SD) has been widely used as the decoding algorithm in MIMO systems which achieve near Maximum Likelihood (ML) performance with reduced complexity. The complexity of SD increases considerably with increase in system configuration or modulation order. In this paper an efficient early pruning technique has been proposed which eliminates the nodes that are unlikely to contribute to near ML solution which results in reduced complexity. The simulation shows a reduction of 41 % of complexity at 18 dB SNR. The proposed algorithm for uncoded 4X4 MIMO system with 16-QAM modulation is synthesized using Xilinx Virtex 5 XC5VLX50T FPGA. The FPGA resource utilization and timing summary shows a considerable improvement with the existing one.
关键词：Sphere Decoder; Maximum Likelihood Detector; Multiple-Input Multiple-Output; Schnorr-Euchner Algorithm; Early Termination; Field Programmable Gate Array; Bit Error Rate
