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...n these schemes, they perform poorly if the phase noise varies fast in comparison to the OFDM symbol rate. To overcome this difficulty, some ICI compensation schemes have been proposed. The method in =-=[11]-=- utilizes the pilot tones, which are sufficiently separated away from the data tones, to transmit pilot symbols for phase noise estimation. In the self-cancellation method presented in [12] and [13], ...

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...der modulations need to be employed or if the spacing between the carriers is to be reduced. To compensate for phase noise several methods have been proposed. These can be divided into time domain [1]=-=[2]-=- and frequency domain approaches [3][4][5]. In this paper we propose an algorithm for tracking the average phase noise offset also known as the common phase error (CPE)[6] in the frequency domain usin...

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... systems operate on discrete signals, the Fourier series analysis above is less according the nature of the case than the Discrete Fourier Transform (DFT) analysis presented in this section (see also =-=[14]). In t-=-he digital case the complex envelope of the transmitted signal and the received symbol for the r-th carrier ˜ Br are given by (compare with (13) and (15)) 3 : N−1 � 2π j Ck . e N ki , ˜ Br = 1 ...

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...s of CFO and PHN have been well documented [1], successful alleviation of these combined problems based on a statistically optimal receiver implementation, which must include channel estimation in the presence of CFO and PHN, have not been proposed. In [2], [3] and [4] PHN suppression methods were proposed for frequency selective channels but the channel frequency response was assumed to be known prior to PHN suppression. In [5] PHN was considered in the formulation of the channel estimation problem but was not directly used in the solution and thus the method is not statistically optimal. In [6] channel estimation was performed but the PHN was estimated using at least one “carrier recovery” pilot tone that required frequency guard bands on both band edges to minimize interference from data symbols. Only specific frequency selective channels were considered in the simulations, but the performance may degrade in general Rayleigh frequency selective channels since a channel null could occur in the vicinity of the pilot tone. In this paper, our goal is to tackle the channel estimation problem when CFO and PHN are present from a maximum likelihood stand-point. Special features of the like...

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...ce of the CPEC algorithm for � ��and � � � kHz of the the FBCF is able to continuously track and correct for the error caused by phase noise in the FEQ. This is in contrast to the schemes =-=proposed in [10]-=-, [5], [11], which only compensate the CPE using a symbol-by-symbol estimate in a manner similar to using only the CPESE part of our proposal. IV. SIMULATION PARAMETERS AND RESULTS Appropriate models ...