Orthogonal Frequency Division Multiplexing based on Offset Quadrature Amplitude Modulation (OFDM/OQAM) systems are highly sensitive to Carrier Frequency Offset (CFO), especially in doubly selective fading channels. In this paper, by modeling the doubly selective channel with Basis Expansion Model (BEM), we prove the cyclostationarity of the received OFDM/OQAM signal in the presence of CFO. A bl...

This paper presents results from analysis into the performance of Turbo Codes over the aeronautical satellite channel. Currently, only limited services (voice, fax, low rate data) are available for aeronautical travelers. A major constraint is the cost of providing an aircraft qualiied antenna with high gain. This limits the data transmission rates that can be supported. In the future, more pow...

Block fading is a popular channel model that approximates the behavior of different wireless communication systems. Automatic-repeat request (ARQ) protocols are used to provide reliable communication in wireless networks. In this paper the throughput of the basic selective-repeat (SR) ARQ in block fading environments is derived. Single-antenna ARQ systems employing both coherent BPSK and QPSK a...

The performance of the minimum mean-squared error (MMSE) receiver for detection of direct sequence code division multiple access is considered in various fading channel models. Several modifications to the basic MMSE receiver structure which have been recently proposed for use on nonselective fading channels are reviewed and shown to represent different approximations to a single common form. T...

A decision-feedback MAP receiver for time-selective fading CDMA channels is proposed. The receiver consists of a sequence-matched jilter and a MAP demodulator Output samples from the matched~lter are fed into the MAP demodulator The MAP demodulator exploits the channel memory by delaying the decision and using a sequence of observations. This receiver also rejects MAI and estimates channel fadi...

| This paper addresses the design and performance evaluation of a pilot-aided turbo-coded system to achieve reliable PSK communication in frequency-at, time-selective fading, with a relatively high Doppler rate. We introduce a suitable Markov model with a nite number of states, designed to approximate both the values and the statistical properties of the correlated at fading channel phase, whic...

In this paper, a detailed theoretical analysis of fading margin in an asynchronous code division multiple access (A-CDMA) system is discussed. Rayleigh and Rician frequency-selective slowly fading channels are considered. Probability distribution and density functions of the probability of error are derived for Rayleigh and Rician fading channels. The fluctuations in the channel capacity are pr...

Recently, the multi-input multi-output (MIMO) multiplexing technique has been gaining much attention for achieving very high speed data transmissions in a bandlimited wireless channel. However, if single-carrier (SC) transmission is used, the bit error rate (BER) performance significantly degrades due to inter-symbol interference (ISI) resulting from a severe frequencyselective fading channel. ...

A decision-feedback maximum a posteriori (MAP) receiver is proposed for code-division multiple-access channels with time-selective fading. The receiver consists of a sequence-matched filter and a MAP demodulator. Output samples (more than one per symbol) from the matched filter are fed into the MAP demodulator. The MAP demodulator exploits the channel memory by delaying the decision and using a...

This paper considers two well-known selective-repeat retransmission schemes, namely, hybrid typeI ARQ and hybrid type-II ARQ, using convolutional coding, in conjunction with maximum-likelihood code combining. Our theoretical analysis, based upon the concept of generalized weight distribution, shows that the use of code combining yields a significant throughput at very high channel error rates n...