Solving IQ Mismatch Problem for Two-Path Successive Relaying OFDMA Uplink Systems With Direct Conversion Transceivers

In this letter, the properties of two-path successive relaying systems are exploited to develop an iterative decision directed algorithm to estimate in-phase/quadrature-phase mismatch parameters occurring at the transmitters, relays, and destination for the uplink orthogonal frequency-division multi...

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Bibliographic Details
Published inIEEE wireless communications letters Vol. 8; no. 1; pp. 33 - 36
Main Author Marey, M.
Format Journal Article
LanguageEnglish
Published Piscataway IEEE 01.02.2019
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subjects
Algorithms
Channel estimation
Computer simulation
Cooperative systems
Detectors
Direct conversion
Estimation
Frequency division multiple access
IQ mismatch
Iterative methods
Maximum likelihood estimates
OFDM
OFDMA
Orthogonal Frequency Division Multiplexing
Parameter estimation
Relaying
Relays
Time-domain analysis
Transceivers
Transmitters
Uplink
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Summary:In this letter, the properties of two-path successive relaying systems are exploited to develop an iterative decision directed algorithm to estimate in-phase/quadrature-phase mismatch parameters occurring at the transmitters, relays, and destination for the uplink orthogonal frequency-division multiple access transmission. These parameters along with the actual channel taps of different links are treated as a single unknown parameter to be estimated. A space-alternating generalized expectation-maximization tool is employed to compute the maximum-likelihood estimate. The proposed algorithm iterates between data detector and estimator in order to refine the estimation process. Simulation results confirm the effectiveness of the proposed estimator.
ISSN:2162-2337
2162-2345
DOI:10.1109/LWC.2018.2849373