A novel IQ imbalance and channel estimation algorithm for Alamouti OFDM systems

This paper shows that the unwanted In-phase/quadrature (IQ) imbalance can be exploited to achieve a diversity gain for Alamouti space-time coding orthogonal frequency division multiplexing (AL-OFDM) systems. In addition, we propose a novel iterative algorithm to jointly estimate the channel impulse...

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Bibliographic Details
Published in:2013 IEEE International Conference on Communications (ICC) pp. 3220 - 3224
Main Authors: Marey, Mohamed, Samir, Moataz Shoukry, Ahmed, Mohamed Hossam, El-Shenawy, Hamed, Elhennawy, Adel
Format: Conference Proceeding
Language:English
Published: IEEE 01.06.2013
Subjects:
Alamouti-code
Bit error rate
Channel estimation
Detectors
Estimation
IQ imbalance
ML and EM algorithms
OFDM
Receivers
Transmitting antennas
ISSN:1550-3607
Online Access:Get full text
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Summary:This paper shows that the unwanted In-phase/quadrature (IQ) imbalance can be exploited to achieve a diversity gain for Alamouti space-time coding orthogonal frequency division multiplexing (AL-OFDM) systems. In addition, we propose a novel iterative algorithm to jointly estimate the channel impulse response (CIR) and IQ imbalance occurring at both the transmitter and receiver. A pilot sequence is employed for initial estimation and detection. Then, soft information is exchanged between the detector and the estimator iteratively in order to enhance the system performance. Simulation results confirm the effectiveness of the proposed algorithms.
ISSN:1550-3607
DOI:10.1109/ICC.2013.6655040