Fading is the time-dependent variation in transmitted signal strength through a complex medium due to interference or temporally evolving multipath scattering. In this paper we use random matrix theory (RMT) to establish a first-principles model for fading, including both universal and nonuniversal effects. This model provides a more general understanding of the most common statistical models (...

Abstract This paper develops an MLSE receiver for the frequency-flat, fast fading channel corrupted by additive Gaussian noise, when linear modulations (M-ASK, M-PSK, M-QAM) are employed. The paper extends Ungerboeck’s derivation of the Extended MLSE receiver for the purely frequency-selective channel to the time-selective channel. Although the new receiver’s structure and metric assume ideal c...

Multicarrier Code Division Multiple Access Schemes (MC-CDMA) have been recently introduced in existing CDMA based systems to improve security, data transmission rate and to minimize Inter Symbol Interference (ISI). CDMA experiences severe multipath fading which badly affects its performance. By transmitting identical narrowband DirectSequence (DS) waveforms using frequency diversity, in paralle...

In this paper, the underlay cognitive radio network over mix fading environment is presented and investigated. A cooperative system with a secondary source node S, destination D, relay Relay, primary P are considered. model system, we consider in two scenarios as Rayleigh/Nakagami-m Nakagami-m/Rayleigh Fading channels. For performance analysis, closed-form expression of outage probability (OP) ...

In this paper we examine the robustness of two element transmit beamforming in the presence of feedback delay and quantization error. Specifically, we examine the robustness of two-element beamforming techniques in the presence of Ricean fading. We show that when the fading is Ricean, feedback methods are significantly more robust than when the fading is Rayleigh. This is significant since many...

One channel model that characterises multipath fading efiFect of a wireless channel is called Flat Rayleigh Fading channel model. Given the properties of Flat Rayleigh Fading channel, an equation to find the capacity of a Flat Rayleigh fading channel with hard decision decoding is derived. The difference of power requirement to achieve the Additive White Gaussian Noise (AWGN) capacity over a Fl...

This paper considers the performance of pilot symbol aided channel estimation by investigating the achievable information rate in a fading channel. The channel is modeled as a time varying Rayleigh fading process whose dynamics are characterized by the normalized fading rate. The optimal fractions of bandwidth and power allocated to the pilot symbols are determined and presented in terms of the...

Prince of Songkla University, Thailand Faculty of Technical Sciences University of Novi Sad, Serbia Abstract: In this paper we analyze the performance in terms of Bit Error Rate (BER) and Frame Error Rate (FER) of a turbo coded system over Rayleigh flat fading channels. A new type of interleaver, Block Random in Line (BRL) interleaver, is proposed and compared with the S-interleaver on the basi...

# This work has been supported by Nokia. Abstract Multicode CDMA with V-BLAST architecture is an attractive scheme to achieve high data rate transmission. We propose an advanced detection scheme, order partial parallel interference cancellation with decision feedback (DF-OPPIC), to combat co-antenna interference and multiple access interference in the system. Compared with the original referenc...

Turbo coding in correlated Rayleigh fading channels is improved by outer block interleaving, but with added complexity and delay. Choosing the wrong number of columns can increase the BER, so a reconfigurable block interleaver with column number optimised for different operating environments is useful. Simulation results are presented for the four block interleaver configurations specified for ...