Frequency-Asynchronous Multiuser Joint Channel-Parameter Estimation, CFO Compensation and Channel Decoding
Taotao Wang, Soung Chang Liew

TL;DR
This paper presents a joint multiuser channel-parameter estimation, CFO compensation, and channel decoding framework for OFDM-IDMA systems, addressing frequency asynchrony and intertwined channel estimation errors with iterative algorithms.
Contribution
It introduces a novel iterative framework combining SAGE and ECM algorithms to jointly solve multiuser channel estimation, CFO compensation, and decoding, improving performance over existing methods.
Findings
Significant performance gains demonstrated through simulations.
Framework effectively handles multiple CFOs and intertwined channel errors.
Validated with real experiments on software-defined radio.
Abstract
This paper investigates a channel-coded multiuser system operated with orthogonal frequency-division multiplexing (OFDM) and interleaved division multiple-access (IDMA). To realize the potential advantage of OFDM-IDMA, two challenges must be addressed. The first challenge is the estimation of multiple channel parameters. An issue is how to contain the estimation errors of the channel parameters of the multiple users, considering that the overall estimation errors may increase with the number of users because the estimations of their channel parameters are intertwined with each other. The second challenge is that the transmitters of the multiple users may be driven by different RF oscillators. The associated frequency asynchrony may cause multiple CFOs at the receiver. Compared with a single-user receiver where the single CFO can be compensated away, a particular difficulty for a…
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