Energy Efficient Group-Sort QRD Processor with On-line Update for MIMO Channel Pre-processing

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Abstract

This paper presents a Sorted QR-Decomposition (SQRD) processor for 3GPP LTE-A system. It achieves energy efficiency by co-optimizing techniques, such as heterogeneous processing, reconfigurable architecture, and dual-supply voltage operation. At algorithm level, a low-complexity hybrid decomposition scheme is adopted, which switches, depending on the energy distribution of spatial channels, between the traditional brute-force SQRD and a proposed group-sort QR update strategy. A reconfigurable vector processor is accordingly developed to support the adaptive processing with high hardware efficiency. Furthermore, on-chip power management technique is also integrated to obtain real-time power-saving by adapting the voltage supply based on the instantaneous workload. As a proof-of-concept, we implemented the processor using a 65nm CMOS technology and conducted post-layout simulation. The proposed SQRD processor occupies 0.71mm2 core area and has a throughput of up to 69MQRD/s. Compared to the brute-force approach, an energy reduction of 10~61.8% is achieved.

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Subject classification (UKÄ) – MANDATORY

  • Electrical Engineering, Electronic Engineering, Information Engineering

Keywords

  • QR decomposition, sorting, channel preprocessing, MIMO, reconfigurable processor
Original languageEnglish
Pages (from-to)1220-1229
JournalIEEE Transactions on Circuits and Systems Part 1: Regular Papers
Volume62
Issue number5
Publication statusPublished - 2015
Publication categoryResearch
Peer-reviewedYes

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