Conditional Power and Rate Adaptation for MQAM/OFDM Systems Under CFO With Perfect and Imperfect Channel Estimation Errors

In this paper, a new conditional power and rate adaptation scheme for orthogonal frequency-division multiplexing (OFDM) systems is proposed in the presence of carrier frequency offset (CFO), with perfect and imperfect channel state information (CSI). The conventional adaptive scheme is shown to be a...

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Bibliographic Details
Published in:IEEE transactions on vehicular technology 2015-11, Vol.64 (11), p.5042-5055
Main Authors: Zhicheng Dong, Pingzhi Fan, Panayirci, Erdal, Xianfu Lei
Format: Article
Language:English
Subjects:
Adaptation
Adaptation models
Adaptive systems
Approximation methods
Average Spectral Efficiency (ASE)
Bit error rate
Carrier Frequency Offset (CFO)
Channel estimation
Codes
Communication channels
Conditional Power and Rate Adaptation
Intercarrier Interference (ICI)
OFDM
Optimization
Orthogonal Frequency Division Multiplexing (OFDM)
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Summary:In this paper, a new conditional power and rate adaptation scheme for orthogonal frequency-division multiplexing (OFDM) systems is proposed in the presence of carrier frequency offset (CFO), with perfect and imperfect channel state information (CSI). The conventional adaptive scheme is shown to be a special case of the conditionally adaptive scheme technique that enables the resulting nonconvex optimization problem, which is solved in a feasible way. It leads to a solution for optimal power adaptation that maximizes the spectral efficiency of an OFDM system using M-ary quadrature amplitude modulation (MQAM) under average power and instantaneous bit error rate (BER) constraints. Closed-form expressions for the average spectral efficiency (ASE) of adaptive OFDM systems are derived for perfect and imperfect CSI cases. The theoretical results and computer simulations show that range of the conditional adaptation becomes narrow and the performance of constant power and continuous rate is very close to that of the conditionally adaptive power and continuous rate for higher CFO or high signal-to-noise ratio (SNR) values.
ISSN:0018-9545
1939-9359
DOI:10.1109/TVT.2014.2377153