Efficient Implementation of QR Decomposition for Gigabit MIMO-OFDM Systems

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题名:	Efficient Implementation of QR Decomposition for Gigabit MIMO-OFDM Systems
作者:	Huang,ZY;Tsai,PY
贡献者:	電機工程學系
关键词:	ALGORITHM;ARCHITECTURE
日期:	2011
上传时间:	2012-03-28 10:14:26 (UTC+8)
出版者:	國立中央大學
摘要:	This paper presents a VLSI architecture of QR decomposition for 4x4 MIMO-OFDMsystems. A real-value decomposed MIMO system model is handled and thus the channel matrix to be processed is extended to the size of 8x8. Instead of direct factorization, a QR decomposition scheme by cascading one complex-value and one real-value Givens rotation stages is proposed, which can save 44% hardware complexity. Besides, the requirement of skewed inputs in the conventional QR-decomposition systolic array is eliminated and 36% of delay elements are removed. The real-value Givens rotation stage is also constructed in a form of a stacked triangular systolic array to match with the throughput of the complex-value one. Hardware sharing is considered to enhance the utilization. The proposed design is implemented in 0.18-mu m CMOS technology with 152K gates. From measurement, the maximum operating frequency is 100 MHz. It generates QR decomposition results every four clock cycles and accomplishes continuous projection every clock cycle to support MIMO detection up to 2.4 Gb/s. The measured power consumption is 318.6 mW and 219.6 mW for QR decomposition and projection, respectively, at the highest operating frequency. From the comparison, our proposed design achieves the highest throughput with high efficiency.
關聯:	IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS I-REGULAR PAPERS
显示于类别:	[電機工程學系] 期刊論文

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