A Generalized Method of Moments Detector for Block Fading SIMO Channels

Joao Vieira; Fredrik Rusek; Fredrik Tufvesson

doi:10.1109/LCOMM.2016.2561919

A Generalized Method of Moments Detector for Block Fading SIMO Channels

Joao Vieira, Fredrik Rusek, Fredrik Tufvesson

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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.
A coherence interval of about 5 symbol intervals is sufficient to reach these gains

Original language	English
Article number	7464260
Pages (from-to)	1477-1480
Number of pages	4
Journal	IEEE Communications Letters
Volume	20
Issue number	7
DOIs	https://doi.org/10.1109/LCOMM.2016.2561919
Publication status	Published - 2016 Jul 1

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Telecommunications

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10.1109/LCOMM.2016.2561919

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title = "A Generalized Method of Moments Detector for Block Fading SIMO Channels",

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.A coherence interval of about 5 symbol intervals is sufficient to reach these gains",

author = "Joao Vieira and Fredrik Rusek and Fredrik Tufvesson",

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T1 - A Generalized Method of Moments Detector for Block Fading SIMO Channels

AU - Vieira, Joao

AU - Rusek, Fredrik

AU - Tufvesson, Fredrik

PY - 2016/7/1

Y1 - 2016/7/1

N2 - 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

AB - 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

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DO - 10.1109/LCOMM.2016.2561919

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JO - IEEE Communications Letters

JF - IEEE Communications Letters

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A Generalized Method of Moments Detector for Block Fading SIMO Channels

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Algorithms and Proofs of Concept for Massive MIMO Systems

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