Modulation diversity effects in rayleigh fading multipath channels

2014 ◽  
Author(s):  
Raphael Tavares de Alencar ◽  
Matheus de Araujo Cavalcante ◽  
Waslon Terllizzie Araujo Lopes ◽  
Wamberto Jose Lira de Queiroz ◽  
Marcelo Sampaio de Alencar
Keyword(s):  
Rayleigh Fading ◽  
Multipath Channels ◽  
Diversity Effects ◽  
Modulation Diversity

Combining Modulation Diversity and Index Assignment to Improve Image VQ for a Rayleigh Fading Channel

2016 ◽  
Author(s):  
Waslon Terllizzie A. Lopes ◽  
Francisco Madeiro ◽  
Benedito G. Aguiar Neto ◽  
Marcelo S. Alencar
Keyword(s):  
Fading Channel ◽  
Rayleigh Fading ◽  
Rayleigh Fading Channel ◽  
Index Assignment ◽  
Modulation Diversity

Multi-branch DFE for Rayleigh fading multipath channels

1997 ◽  
Vol 33 (18) ◽  
pp. 1537
Author(s):  
D.J. Brooks ◽  
J.A. Chambers
Keyword(s):  
Rayleigh Fading ◽  
Multipath Channels

scholarly journals An Oversampling-based Correlator-type Receiver for DCSK Communication Systems Over Generalized Flat Rayleigh Fading Channels

2016 ◽  
Author(s):  
Quyen Xuan Nguyen
Keyword(s):  
Fading Channels ◽  
System Performance ◽  
Communication Systems ◽  
Rayleigh Fading ◽  
Sampling Rate ◽  
Multipath Channels ◽  
Noise Power ◽  
Noise Power Spectral Density ◽  
Transmission Period ◽  
Flat Rayleigh Fading

This paper proposes an oversampling-based correlator-type receiver for Differential Chaos-shift Keying (DCSK) communication systems, which can exploit the flat-fading characteristic of multipath channels in order to improve the system performance. At the receiver, the incoming signal is sampled with a sampling rate higher than chip rate before feeding to a correlator. This oversampling step aims to specifically determine delayed-signal components from fading multipath channels, which can be combined together by the correlator in order to increase the ratio of signal-to-noise at its output. In particular, the performance of the proposed receiver is investigated by means of a generalized flat Rayleigh fading channel which has one primary path (i.e., the path having the shortest transmission period) and multiple secondary paths (i.e., the other remaining paths with delays). Mathematical models in discrete-time domain for the conventional transmitter, generalized channel, and proposed receiver are proposed and analyzed. The theoretical bit-error-rate (BER) expression is first derived and then distribution histogram for the ratio of variable bit energy to noise power spectral density is computed. The BER performance is finally estimated by integrating the BER expression over all possible values of the histogram. Numerical simulations with specific parameters are carried out and then simulated performances are shown in comparison to estimated ones. Obtained results point out that the system performance is significantly improved when the number of secondary paths increases.

Combining modulation diversity and index assignment to improve image VQ for a rayleigh fading channel

2004 ◽  
Vol 2 (1) ◽  
pp. 22-33
Author(s):  
Waslon Terllizzie Araújo Lopes ◽  
Francisco Madeiro ◽  
Benedito Guimarães Aguiar Neto ◽  
Marcelo Sampaio de Alencar
Keyword(s):  
Fading Channel ◽  
Rayleigh Fading ◽  
Rayleigh Fading Channel ◽  
Index Assignment ◽  
Modulation Diversity
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