Paper Info
Title
Conditional Power and Rate Adaptation for MQAM/OFDM Systems under CFO with Perfect and Imperfect Channel Estimation Errors
Abstract
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. The conventional adaptive scheme is shown to be a special case of the conditionally adaptive scheme technique which enables the resulting non-convex optimization problem, 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 channel state information (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 noise ratio (SNR) values.
Year
DOI
Venue
2015
10.1109/TVT.2014.2377153
Vehicular Technology, IEEE Transactions  
Keywords
Field
DocType
OFDM,Bit error rate,Approximation methods,Channel estimation,Optimization,Adaptive systems,Adaptation models
Quadrature amplitude modulation,Computer science,Adaptive system,Control theory,Carrier frequency offset,Signal-to-noise ratio,Electronic engineering,Spectral efficiency,Amplitude modulation,Orthogonal frequency-division multiplexing,Bit error rate
Journal
Volume
Issue
ISSN
PP
99
0018-9545
Citations 
PageRank 
References 
5
0.42
20
Authors
4
Name
Order
Citations
PageRank
Zhicheng Dong1365.52
Pingzhi Fan23233265.09
Erdal Panayirci347549.51
Xianfu Lei480243.53