Sign-select lookahead CORDIC based high-speed QR decomposition architecture for MIMO receiver applications

Min Woo Lee, Jongsun Park

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)


This paper presents a high-speed QR decomposition architecture for the multi-input-multioutput (MIMO) receiver based on Givens rotation. Under fast-varying channel, since the inverse matrix calculation has to be performed frequently in MIMO receiver, a high performance and low latency QR decomposition module is highly required. The proposed QR decomposition architecture is composed of Sign-Select Lookahead (SSL) coordinate rotation digital computer (CORDIC). In the SSL-CORDIC, the sign bits, which are computed ahead to select which direction to rotate, are used to select one of the last iteration results, therefore, the data dependencies on the previous iterations are efficiently removed. Our proposed QR decomposition module is implemented using TSMC 0.25 μm CMOS process. Experimental results show that the proposed QR architecture achieves 34.83% speed-up over the Compact CORDIC based architecture for the 4 × 4 matrix decomposition.

Original languageEnglish
Pages (from-to)6-14
Number of pages9
JournalJournal of Semiconductor Technology and Science
Issue number1
Publication statusPublished - 2011 Mar


  • Givens rotation
  • High-performance CORDIC
  • Lookahead
  • QR decomposition
  • Sign prediction
  • Vectoring mode

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Electrical and Electronic Engineering


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