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

In English

Författare

Summary, in English

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.

Publiceringsår

2015

Språk

Engelska

Sidor

901-908

Publikation/Tidskrift/Serie

Microprocessors and Microsystems

Volym

39

Issue

8

Dokumenttyp

Artikel i tidskrift

Förlag

Elsevier

Ämne

  • Electrical Engineering, Electronic Engineering, Information Engineering

Nyckelord

  • MIMO
  • Detector
  • Soft-output
  • Low-latency

Status

Published

Forskningsgrupp

  • Digital ASIC

ISBN/ISSN/Övrigt

  • ISSN: 0141-9331