A Generalized Method of Moments Detector for Block Fading SIMO Channels
Author
Summary, in English
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
A coherence interval of about 5 symbol intervals is sufficient to reach these gains
Department/s
Publishing year
2016-07-01
Language
English
Pages
1477-1480
Publication/Series
IEEE Communications Letters
Volume
20
Issue
7
Full text
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Document type
Journal article (letter)
Publisher
IEEE - Institute of Electrical and Electronics Engineers Inc.
Topic
- Telecommunications
Status
Published
ISBN/ISSN/Other
- ISSN: 1089-7798