-In this paper, a hit inversion (BI) procedure in previous works is furtherinvestigated over multipath frequency selective fading' channels for DS-CDMA communication systems. Moreover, after the BI procedure performed with partial parallel interference, cancellation (PPIC) schemes where the partial cancellation weight (PCW) is adapted by the least mean square (LMS) adaptive filtering algorithm,...

Two open-loop algorithms are developed for estimating jointly frequency offset and symbol timing of a linearly modulated waveform transmitted through a frequency-flat fading channel. The methods exploit the received signal’s second-order cyclostationarity and, with respect to existing solutions: 1) they take into account the presence of time-selective fading effects; 2) they do not need trainin...

This paper develops an MLSE diversity receiver for the timeand frequency-selective channel corrupted by additive Gaussian noise, when linear constellations are employed. The paper extends Ungerboeck’s derivation of the Extended MLSE receiver for the purely frequency-selective channel to the more general channel with diversity. The new receiver structure and metric assume a known channel. The ma...

This research examines the performance of a spectrally encoded, multi-carrier, phase shift keying communications system in a frequency-selective, slowly-fading multipath channel. The specific communications system modeled is the transform domain communication system (TDCS) originally researched as an interference avoidance technique. Previous TDCS research assumed an additive white Gaussian noi...

In this paper, a new fast error resilient entropy coder (FEREC) for robust image transmission over wireless fading channels is proposed. A slow, frequency non-selective Rayleigh fading channel model is used. The proposed FEREC algorithm is observed to be almost twice as fast as EREC 3] in encoding the data and hence the error resilience capability is also signii-cantly better. Upto 2 dB improve...

In this paper we consider a channel model that is often used to describe the mobile wireless scenario: multipleantenna additive white Gaussian noise channels subject to random (fading) gain with full channel state information at the receiver. Dynamics of the fading process are approximated by a piecewise-constant process (frequency non-selective isotropic block fading). This work addresses the ...

This paper presents an analytical framework to calculate the average symbol-error rate (SER) of uncoded orthogonal frequency-division multiplexing (OFDM) systems in realistic scenarios impaired by transmitter nonlinearity and frequency-selective fading channels. The results are applicable to cyclically extended OFDM signals characterized by a high number of carriers, which can be modeled as com...

In this report, we present the techniques for constructing Space-Time Block Codes based on division algebra. Even though commutative division algebra can be applied for the construction, we focus on noncommutative division algebra, especially in the construction of so-called perfect space-time (ST) block codes. These codes provide full rate, full diversity and non-vanishing constant minimum det...

Code-division multiple-access (CDMA) systems with random spreading and channel uncertainty at the receiver are studied. Frequency selective single antenna, as well as, narrowband multiple antenna channels are considered. Rayleigh fading is assumed in all cases. General Bayesian approach is used to derive both iterative and non-iterative estimators whose performance is obtained in the large syst...

Wireless communication systems operating over time-varying fading channels require adaptive signal processing to equalize the channel variations at the receiver. In wireless applications, the received signal is typically affected by frequency-selective fading and channel equalization is required to mitigate the resulting inter symbol interference (ISI). In this paper an adaptive model has been ...