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

Zhang, Chenxin LU ; Prabhu, Hemanth LU ; Liu, Yangxurui LU ; Liu, Liang LU ; Edfors, Ove LU and Öwall, Viktor LU (2015) In IEEE Transactions on Circuits and Systems Part 1: Regular Papers 62(5). p.1220-1229
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... (More)
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. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
QR decomposition, sorting, channel preprocessing, MIMO, reconfigurable processor
in
IEEE Transactions on Circuits and Systems Part 1: Regular Papers
volume
62
issue
5
pages
1220 - 1229
publisher
IEEE--Institute of Electrical and Electronics Engineers Inc.
external identifiers
  • wos:000353887300002
  • scopus:85027939515
ISSN
1549-8328
DOI
10.1109/TCSI.2015.2402936
project
EIT_SOS VINNOVA Industrial Excellence Center - System Design on Silicon
language
English
LU publication?
yes
id
369f2da4-a364-4a80-a65d-170e1db3816d (old id 5050000)
date added to LUP
2015-02-16 13:53:56
date last changed
2017-11-12 03:07:21
@article{369f2da4-a364-4a80-a65d-170e1db3816d,
  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.},
  author       = {Zhang, Chenxin and Prabhu, Hemanth and Liu, Yangxurui and Liu, Liang and Edfors, Ove and Öwall, Viktor},
  issn         = {1549-8328},
  keyword      = {QR decomposition,sorting,channel preprocessing,MIMO,reconfigurable processor},
  language     = {eng},
  number       = {5},
  pages        = {1220--1229},
  publisher    = {IEEE--Institute of Electrical and Electronics Engineers Inc.},
  series       = {IEEE Transactions on Circuits and Systems Part 1: Regular Papers},
  title        = {Energy Efficient Group-Sort QRD Processor with On-line Update for MIMO Channel Pre-processing},
  url          = {http://dx.doi.org/10.1109/TCSI.2015.2402936},
  volume       = {62},
  year         = {2015},
}