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A Generalized Method of Moments Detector for Block Fading SIMO Channels

Vieira, Joao LU ; Rusek, Fredrik LU and Tufvesson, Fredrik LU (2016) In IEEE Communications Letters 20(7). p.1477-1480
Abstract
In this letter we apply the Generalized Method of Moments (GMM), widely used in econometrics, to receivers operating with imperfect channel state information (CSI) of singleinput-multiple-output (SIMO) block-fading channels where a single pilot symbol is used. The GMM results in the standard maximum ratio combining (MRC) receiver, but with an improved channel estimate. Although not our goal at the outset, this result reveals an inherent capability of the GMM to improve any channel estimate through filtering of the initial channel estimate with a matrix that is constructed from the received signals. The filtering involves a matrix inverse of size min {T, M}, where M is the number of receive antennas, and T + 1 is the coherence interval of... (More)
In this letter we apply the Generalized Method of Moments (GMM), widely used in econometrics, to receivers operating with imperfect channel state information (CSI) of singleinput-multiple-output (SIMO) block-fading channels where a single pilot symbol is used. The GMM results in the standard maximum ratio combining (MRC) receiver, but with an improved channel estimate. Although not our goal at the outset, this result reveals an inherent capability of the GMM to improve any channel estimate through filtering of the initial channel estimate with a matrix that is constructed from the received signals. The filtering involves a matrix inverse of size min {T, M}, where M is the number of receive antennas, and T + 1 is the coherence interval of the channel. The gain over an MRC receiver, using a scaled version of the pilot observation as channel estimate, lies in the range 0.1-3 dB depending on the system configuration.
A coherence interval of about 5 symbol intervals is sufficient to reach these gains (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
IEEE Communications Letters
volume
20
issue
7
pages
4 pages
publisher
IEEE--Institute of Electrical and Electronics Engineers Inc.
external identifiers
  • scopus:84978664172
  • wos:000384642500052
ISSN
1089-7798
DOI
10.1109/LCOMM.2016.2561919
language
English
LU publication?
yes
id
232852ad-58c1-4cd6-8f71-baaf401eacd7
date added to LUP
2016-06-13 09:32:04
date last changed
2017-09-18 11:29:27
@article{232852ad-58c1-4cd6-8f71-baaf401eacd7,
  abstract     = {In this letter we apply the Generalized Method of Moments (GMM), widely used in econometrics, to receivers operating with imperfect channel state information (CSI) of singleinput-multiple-output (SIMO) block-fading channels where a single pilot symbol is used. The GMM results in the standard maximum ratio combining (MRC) receiver, but with an improved channel estimate. Although not our goal at the outset, this result reveals an inherent capability of the GMM to improve any channel estimate through filtering of the initial channel estimate with a matrix that is constructed from the received signals. The filtering involves a matrix inverse of size min {T, M}, where M is the number of receive antennas, and T + 1 is the coherence interval of the channel. The gain over an MRC receiver, using a scaled version of the pilot observation as channel estimate, lies in the range 0.1-3 dB depending on the system configuration.<br/>A coherence interval of about 5 symbol intervals is sufficient to reach these gains},
  articleno    = {7464260},
  author       = {Vieira, Joao and Rusek, Fredrik and Tufvesson, Fredrik},
  issn         = {1089-7798},
  language     = {eng},
  month        = {07},
  number       = {7},
  pages        = {1477--1480},
  publisher    = {IEEE--Institute of Electrical and Electronics Engineers Inc.},
  series       = {IEEE Communications Letters},
  title        = {A Generalized Method of Moments Detector for Block Fading SIMO Channels},
  url          = {http://dx.doi.org/10.1109/LCOMM.2016.2561919},
  volume       = {20},
  year         = {2016},
}