scholarly journals New 3D 16-Ary Signal Constellations and Their Symbol Error Probabilities in AWGN and Rayleigh Fading Channels

2018 ◽  
Vol 2018 ◽  
pp. 1-6
Author(s):  
Zhenxing Chen ◽  
Jiaheng Liu ◽  
Shuang Li ◽  
Seog Geun Kang
Keyword(s):  
Fading Channels ◽  
Fading Channel ◽  
Euclidean Distance ◽  
Rayleigh Fading ◽  
Additive White Gaussian Noise ◽  
Three Dimensional ◽  
Rayleigh Fading Channel ◽  
Error Performance ◽  
Signal Constellations ◽  
Error Probabilities

Two three-dimensional (3D) 16-ary signal constellations having extended lattice structures are presented in this paper. The theoretical symbol error probabilities (SEPs) of the new constellations in additive white Gaussian noise (AWGN) and Rayleigh fading channel are derived. Computer simulation confirms that the closed-form expressions for average SEPs of the constellations in the AWGN channel are very accurate. The theoretical SEP upper bounds in the Rayleigh fading channel are very tight. Since the presented constellations have larger minimum Euclidean distance (MED) than the conventional one, error performance can be improved up to 0.9 dB in an AWGN environment. Hence, the proposed constellations and their theoretical analysis can be used as a reference for the development of a wireless communication system with 3D signal constellations.

scholarly journals Simulation and Analysis of MC-CDMA System under AWGN and Rayleigh Fading Channel

2013 ◽  
Vol 6 (2) ◽  
pp. 336-342
Author(s):  
Bhavana Kulhare ◽  
Dr. Poonam Sinha
Keyword(s):  
Fading Channel ◽  
Rayleigh Fading ◽  
Additive White Gaussian Noise ◽  
Standard Technique ◽  
Multipath Fading ◽  
Rayleigh Fading Channel ◽  
Complete Analysis ◽  
Cdma System ◽  
Spectrum Utilization ◽  
Code Division Multiple

This paper presents a detailed analysis of Multicarrier Code Division Multiple Access (MC-CDMA) system over Additive White Gaussian Noise (AWGN) and Rayleigh Fading Channel with analysisof the effects of different number of sub-carriers and multiuser scenarios and at the end a comparison with standard technique is also performed. The complete analysis is performed by simulating the mathematical model of the MC-CDMA system with various combinations of sub-carriers, number of users, SNR, path gains and path delays etc. the simulation results shows that the MC-CDMA is an effective way to overcome the multipath fading losses and spectrum utilization with relatively simple system architecture.

scholarly journals Design of Polar Codes for Rayleigh Fading Channel using Random Interleaver and DeInterleaver

2019 ◽  
Vol 8 (6S) ◽  
pp. 1068-1071
Keyword(s):  
Fading Channels ◽  
Fading Channel ◽  
Rayleigh Fading ◽  
Multipath Fading ◽  
Rayleigh Fading Channel ◽  
Polar Codes ◽  
Multipath Fading Channels ◽  
Code Construction ◽  
Polar Code ◽  
Effective Output

Rayleigh fading channel in polar codes based on random interleaver and de-interleaver is presented in this paper. Multipath fading channels are obtained by inducing the sub channels based on the transformation of polarizations. This will track the noise and diversity in the channels. The performance of polar code is improved by constructing the dynamic frozen symbol and the Nakagami channel is introduced in estimating diversity system. Random inter leaver and deinterleaver will permute the signals in effective way. Code construction will allow the system to map the address of memory location. Here the polar code encoding system will analyze the characteristics of channels. The results show that effective output is obtained based on polar code fading channel

scholarly journals Low-complexity Detectors for Cyclic Structured Space-time Block Coded Spatial Modulation over a Slow Rayleigh Fading Channel

2020 ◽  
pp. 818-825
Author(s):  
Dickson O. Egbune ◽  
◽  
Babatunde S. Adejumobi ◽  
Isaac O. A. Omeiza ◽  
Frank A. Ibikunle ◽  
...  
Keyword(s):  
Computational Complexity ◽  
Fading Channel ◽  
Rayleigh Fading ◽  
Low Complexity ◽  
Space Time ◽  
Rayleigh Fading Channel ◽  
Spatial Modulation ◽  
Time Block ◽  
Error Performance ◽  
Average Bit Error Probability

This paper presents low-complexity detectors for space-time block coded spatial modulation with cyclic structured (STBC-CSM) codeword over a quasi-static frequency-flat Rayleigh fading channel. Two low-complexity detectors are proposed, which reduce the computational complexity of the STBC-CSM maximum-likelihood (ML) detector and demonstrate near-ML error performance of STBC-CSM. Furthermore, Monte-Carlo simulation results for the proposed schemes are presented to validate the theoretical Average Bit Error Probability (ABEP) of STBC-CSM. The proposed low-complexity detectors can achieve a 99% reduction in computational complexity, when high order M-ary (M > 64) amplitude and/or phase modulation symbols are employed for STBC-CSM.

scholarly journals Performance of Typical 3-D Signal Constellations in Rayleigh Fading Channel

2011 ◽  
Vol 16 (4) ◽  
pp. 680-683
Author(s):  
Zhenxing Chen ◽  
Chae-Cheol Choe ◽  
Seog-Geun Kang
Keyword(s):  
Fading Channel ◽  
Rayleigh Fading ◽  
Rayleigh Fading Channel ◽  
Signal Constellations
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