FREQUENCY SELECTIVE FADING CHANNEL ESTIMATION IN OFDM SYSTEMS USING KL EXPANSION Habib S¸enol

Abstract—In this paper, an iterative and computationally efficient data detection algorithm is proposed based on the space alternating generalized expectation maximization

The proposed approach employs a convenient representation of the discrete multipath fading channel based on the Karhunen-Loeve KL orthogonal expansion and finds MMSE estimates of

It has been shown by computer simulation that, depending on the normalized Doppler frequency, only a small number of expansion coefficients is sufficient to approximate the

In this paper, the effect of imperfect channel estimates on the performance of space time coded systems with transmit antenna selection over frequency selective fading

Thus, KL representation allowed us to tackle the estimation of correlated multipath parameters as a param- eter estimation problem of the uncorrelated coefficients result- ing

Especially, in order to ensure the instantaneous BER constraint under high mobility, a lower bound on the maximum spectral efficiency in adaptive OFDM/MQAM systems is obtained,

Besides, some systems such as OFDM-IM need the channel frequency response at the receiver side for joint detection of the modulated symbols, s β , and the subcarrier indices, I

Uncoded BER comparison for the classical Alamouti space–time coded OFDM system with different Alamouti STBC systems based on OFDM, DFrFT, and DFrCT-OCDM using MMSE equalizer