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A Low-Latency High-Throughput Soft-Output Signal Detector for Spatial Multiplexing MIMO Systems

Granlund, Stefan; Liu, Liang LU ; Zhang, Chenxin LU and Öwall, Viktor LU (2015) In Microprocessors and Microsystems 39(8). p.901-908
Abstract
This paper presents a low latency, high throughput soft-output signal detector for a 4x4 64-QAM spatial-multiplexing MIMO system. To achieve high data-level parallelism and accurate soft information, the detector adopts a channel-adaptive node perturbation technique to generate a list of candidate vectors around an initial linear estimation. The detection algorithm provides a large range and convenient performance-complexity trade-off by adjusting the node perturbation parameter. A partial-parallel pipelined VLSI architecture is developed to implement the algorithm with high throughput, low processing latency, while offering the flexibility to support run-time performance tuning. Moreover, a fast and hardware-friendly node enumeration... (More)
This paper presents a low latency, high throughput soft-output signal detector for a 4x4 64-QAM spatial-multiplexing MIMO system. To achieve high data-level parallelism and accurate soft information, the detector adopts a channel-adaptive node perturbation technique to generate a list of candidate vectors around an initial linear estimation. The detection algorithm provides a large range and convenient performance-complexity trade-off by adjusting the node perturbation parameter. A partial-parallel pipelined VLSI architecture is developed to implement the algorithm with high throughput, low processing latency, while offering the flexibility to support run-time performance tuning. Moreover, a fast and hardware-friendly node enumeration scheme is developed to further reduce the processing delay by exploiting the geometric property of the quadrature amplitude modulation (QAM) constellation. The detector was synthesized using Synopsys Design Compiler with a 65nm CMOS standard cell library. The core area is 0.58mm2 with 290K gates. The peak throughput is 3Gb/s at 500MHz clock frequency with a latency of 20ns. Compared to other reported soft-output MIMO detectors, this is a latency reduction of 71%. The corresponding energy consumption is 33pJ per bit detection. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
MIMO, Detector, Soft-output, Low-latency
in
Microprocessors and Microsystems
volume
39
issue
8
pages
901 - 908
publisher
Elsevier
external identifiers
  • wos:000366879500029
  • scopus:84922954428
ISSN
0141-9331
DOI
10.1016/j.micpro.2015.01.002
language
English
LU publication?
yes
id
a0048d2e-7819-4981-8a02-70badb7f837a (old id 5051463)
date added to LUP
2015-02-19 14:56:43
date last changed
2017-01-01 03:48:59
@article{a0048d2e-7819-4981-8a02-70badb7f837a,
  abstract     = {This paper presents a low latency, high throughput soft-output signal detector for a 4x4 64-QAM spatial-multiplexing MIMO system. To achieve high data-level parallelism and accurate soft information, the detector adopts a channel-adaptive node perturbation technique to generate a list of candidate vectors around an initial linear estimation. The detection algorithm provides a large range and convenient performance-complexity trade-off by adjusting the node perturbation parameter. A partial-parallel pipelined VLSI architecture is developed to implement the algorithm with high throughput, low processing latency, while offering the flexibility to support run-time performance tuning. Moreover, a fast and hardware-friendly node enumeration scheme is developed to further reduce the processing delay by exploiting the geometric property of the quadrature amplitude modulation (QAM) constellation. The detector was synthesized using Synopsys Design Compiler with a 65nm CMOS standard cell library. The core area is 0.58mm2 with 290K gates. The peak throughput is 3Gb/s at 500MHz clock frequency with a latency of 20ns. Compared to other reported soft-output MIMO detectors, this is a latency reduction of 71%. The corresponding energy consumption is 33pJ per bit detection.},
  author       = {Granlund, Stefan and Liu, Liang and Zhang, Chenxin and Öwall, Viktor},
  issn         = {0141-9331},
  keyword      = {MIMO,Detector,Soft-output,Low-latency},
  language     = {eng},
  number       = {8},
  pages        = {901--908},
  publisher    = {Elsevier},
  series       = {Microprocessors and Microsystems},
  title        = {A Low-Latency High-Throughput Soft-Output Signal Detector for Spatial Multiplexing MIMO Systems},
  url          = {http://dx.doi.org/10.1016/j.micpro.2015.01.002},
  volume       = {39},
  year         = {2015},
}