scholarly journals APPLICATION OF EXPECTATION MAXIMIZATION ALGORITHM TO THE SEQUENCE ESTIMATION OF MARY PHASE SHIFT KEYING SIGNALS OVER RAYLEIGH FADING CHANNEL

2001 ◽  
Vol 9 (9) ◽  
pp. 689-696
Author(s):  
EL-MAHDY E.
Keyword(s):  
Phase Shift ◽  
Expectation Maximization ◽  
Fading Channel ◽  
Rayleigh Fading ◽  
Expectation Maximization Algorithm ◽  
Rayleigh Fading Channel ◽  
Phase Shift Keying ◽  
Sequence Estimation ◽  
Shift Keying

Performance of Binary Phase Shift Keying (BPSK) and Quartenary Phase Shift Keying (QPSK) Signalling Schemes in Fast and Frequency Non-Selective Rayleigh Fading Channel with a Decision Feedback Equalizer (DFE) at the Receiver

2009 ◽  
Vol 62-64 ◽  
pp. 99-104 ◽  
Author(s):  
T.I. Raji ◽  
Z.K. Adeyemo
Keyword(s):  
Phase Shift ◽  
Fading Channel ◽  
Rayleigh Fading ◽  
Rayleigh Fading Channel ◽  
Decision Feedback ◽  
Decision Feedback Equalizer ◽  
Phase Shift Keying ◽  
Binary Phase ◽  
Shift Keying ◽  
Binary Phase Shift Keying

In this paper, we study the performance of Binary phase shift keying (BPSK) and Quartenary phase shift keying (QPSK) modulation signalling over fast and frequency non-selective Rayleigh fading channel with mobile digital communication and usually a decision feedback equalizer (DFE) at the receiver. Mobile communication is generally a complex process in which the input modulated signals propagate to the receiver over many different paths resulting in what is known as multipath propagation. Its main effects are delay spread and Doppler spread. These effects result in the channel being classified as fast and frequency non selective. Performances in terms of Bit Error Rate (BER) with respect to the Signal-to-Noise Ratio (SNR) at different selected velocities of 10, 40, 70 and 100km/hr are investigated with Adaptive Equalizer. Simulation results are obtained using MATLAB 7.0 programming language. The results indicate that at all the velocities considered; there is an excessive degradation in the BER performance due to fading with both the BPSK and QPSK modulation schemes. However, the BER improves for BPSK modulation signalling scheme when a decision feedback equalizer is used at the receiver

scholarly journals PERFORMANCE ANALYSIS OF QUADRATURE CHAOS SHIFT

2020 ◽  
Vol 60 (1) ◽  
pp. 1-11
Author(s):  
Hesham Adnan Alabbasi ◽  
Izz Kadhum Abboud ◽  
Fadhil Sahib Hasan
Keyword(s):  
Fading Channel ◽  
Rayleigh Fading ◽  
Reference Signal ◽  
Data Rate ◽  
Rayleigh Fading Channel ◽  
Superior Performance ◽  
Experimental Simulation ◽  
Shift Keying ◽  
Simulation Results ◽  
Chaos Shift Keying

One of the most famous techniques of non-coherent differential chaos shift keying (DCSK) is Quadrature chaos shift keying (QCSK) system, this system suffered from lowering the data rate and increasing the bit energy during the bit transmission even though its rate doubling the one of the DCSK. Short reference (SR) algorithm is proposed for the QCSK system to design the SR-QCSK communication system that enhances these drawbacks. The main idea of the short reference technique is minimizing the length of the reference chaotic signal (β) at a transmitter by a factor P comparing to produce R samples for the new reference signal while the length of the information-bearing signal remained unchanged, this occurs by duplicating the reference signal P times to get the same length as the conventional QCSK. Therefore, the symbol duration is reduced from 2βTc to (R+β)Tc. The data rate and energy saving improvement factor in a percent form is derived and compared with the QCSK and DCSK systems. Also, the BER analytical expression is derived for the SR-QCSK in additive white Gaussian noise and Rayleigh fading channel. The experimental simulation results proved that the theory derivation gives a good analysis tracking for the BER performance. The SR-QCSK system is compared with other DCSK techniques and the simulation results show that it has a superior performance in the multipath Rayleigh fading channel.

scholarly journals The Slashed-Rayleigh Fading Channel Distribution

2019 ◽  
Vol 2019 ◽  
pp. 1-14 ◽  
Author(s):  
E. Gómez-Déniz ◽  
L. Gómez ◽  
H. W. Gómez
Keyword(s):  
Fading Channel ◽  
Rayleigh Fading ◽  
Phase Shift Keying ◽  
Differential Phase Shift ◽  
Practical Applications ◽  
Differential Phase Shift Keying ◽  
Average Channel Capacity ◽  
Shift Keying ◽  
Gaussian Stochastic Processes ◽  
New Distribution

We propose an alternative distribution for modelling fading-shadowing wireless channels. This distribution presents certain advantages over the Rayleigh-lognormal distribution and the K distribution and has proved useful in the setting described. We obtain closed-form expressions for the average channel capacity and for the average bit error rate of differential phase-shift keying and of minimum shift keying when the new distribution is used. This distribution can be obtained exactly as the sum of mutual independent Gaussian stochastic processes, because it must represent the simulation of the fading channel; that is, it simulates the signal envelope. Finally, we describe practical applications of this distribution, comparing it with the Rayleigh-lognormal and K distributions.

Comparative Analysis of Gaussian Minimum Shift Keying and Binary Differential Phase Shift Keying Signalling Schemes with Maximal Ratio Combiner over Rayleigh Environment

2011 ◽  
Vol 367 ◽  
pp. 205-214
Author(s):  
Z.K. Adeyemo ◽  
R.O. Abolade
Keyword(s):  
Phase Shift ◽  
Mobile Communication ◽  
Rayleigh Fading ◽  
Diversity Combining ◽  
Phase Shift Keying ◽  
Differential Phase Shift ◽  
Differential Phase ◽  
Differential Phase Shift Keying ◽  
Gaussian Minimum Shift Keying ◽  
Shift Keying

This paper presents the investigation of two transmission schemes with a diversity combining technique over Rayleigh fading channels. Each of Gaussian Minimum Shift Keying (GMSK) and Binary Differential Phase Shift Keying (BDPSK) transmission schemes was considered with a diversity combining technique known as Maximal Ratio Combining (MRC). Rayleigh fading channel is used statistically to model the communication channel where there is no direct line of sight, which is the attribute of mobile communication. Mobile communication industry is faced with the problem of providing the technology that will be able to support a wide variety of services irrespective of distance, other signals interferences, noise, and objects in the medium of transmission. The system model for the received signal was developed using Jakes model under two propagation paths. The developed model was simulated based on the developed algorithms using MATLAB application package. Two different types of data, randomly generated symbols and image data, were used as the information signal. The results obtained showed that the GMSK scheme had higher average Bit Error Rate (BER) values than the corresponding BDPSK scheme which indicates better performance of BDPSK when the same numbers of bits were transmitted over this channel. Consequently, the quality of the images received with both signalling schemes was in agreement with the BER results. The results obtained showed that though GMSK scheme is comparatively more immune to noise and other interfering signals in this type of fading environment but BDPSK scheme has the advantage of feeding back the output signal to form differential with the input signal which invariably resulted in better average BER of the signal.

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