Error rate of coherent modulation techniques for land mobile satellite channel

2002 ◽  
Author(s):  
S. El-Agooz ◽  
G. Mabrouk ◽  
E.I. Eweda
Keyword(s):  
Error Rate ◽  
Modulation Techniques ◽  
Mobile Satellite ◽  
Coherent Modulation

scholarly journals Bit Error Rate (BER) Performance of MIMO Systems in M-QAM with Nonlinear Effect

2019 ◽  
Vol 9 (2) ◽  
pp. 265-267
Keyword(s):  
Bit Error Rate ◽  
Error Rate ◽  
Mimo Systems ◽  
Mimo System ◽  
High Amplitude ◽  
Transmitter Diversity ◽  
Receiver Diversity ◽  
Alamouti Scheme ◽  
Amplifier Model ◽  
Modulation Techniques

Out object in this paper it to study, the effect of nonlinearity on the bit error rate (BER) of MIMO systems in M-QAM modulation techniques. We consider Saleh’s model (power amplifier model) for the nonlinearity, and apply the nonlinear model on MIMO system with receiver diversity and transmitter diversity. For transmitter diversity, the Space-Time Block Coding (STBC) based on Alamouti scheme is used to provide transmits diversity for two transmitting antennas. The results show that, if there is a high variation in the amplitude of the M- QAM symbols, there will behigh effect of nonlinearity that causes high BER especially for high amplitude symbols at high SNR.

scholarly journals Performance Evaluation of PAM-4 and PAM-2 Modulation Techniques using MATLAB

2018 ◽  
Vol 3 (5) ◽  
pp. 36
Author(s):  
Waliu Olalekan Apena
Keyword(s):  
Bit Error Rate ◽  
Error Rate ◽  
Amplitude Modulation ◽  
Pulse Amplitude ◽  
Data Rate ◽  
Pulse Amplitude Modulation ◽  
Eye Diagram ◽  
Modulation Technique ◽  
Modulation Techniques ◽  
Four Levels

Two Levels Pulse Amplitude Modulation techniques (PAM-2) is failing to cope with the increase in appetite for data and higher data rate with respect to noisy channel. Hence, Four Levels Pulse Amplitude Modulation techniques (PAM-4) was developed. PAM-4 is said to enable two times the data rate as compared to PAM-2. PAM-4 has its pros and cons as compared with PAM-2. This paper compares the performance of Two Levels Pulse Amplitude Modulation technique to Four Levels Pulse Amplitude Modulation technique. The communication system was modeled using Simulink R2016b, the signal passed through an Additive White Gaussian Noise (AWGN) Channel and eye diagram scope was adopted to evaluate the corresponding signal. The study compared eye diagram to evaluate both PAM-2 and PAM-4 at same channel condition. Bit error rate (BER) analysis of the two signals were studied and the results for the corresponding signals were compared. It was observed that the performance of PAM-2 surpasses PAM-4 in terms of the bit error rate analysis. The study shows similar characteristic for Symbol Error Rate Probability curve. The result revealed that PAM-4 is more susceptible to noise than PAM-2.

scholarly journals Implementation of Layered Decoding Architecture for LDPC Code using Layered Min-Sum Algorithm

2017 ◽  
Vol 18 (2) ◽  
pp. 128-136
Author(s):  
Sandeep Kakde ◽  
Atish Khobragade ◽  
Shrikant Ambatkar ◽  
Pranay Nandanwar
Keyword(s):  
Bit Error Rate ◽  
Error Rate ◽  
Vlsi Architecture ◽  
Ldpc Code ◽  
Error Performance ◽  
Ldpc Decoder ◽  
Parallel Design ◽  
Modulation Techniques ◽  
Better Than ◽  
Bpsk Modulation

For binary field and long code lengths, Low Density Parity Check (LDPC) code approaches Shannon limit performance. LDPC codes provide remarkable error correction performance and therefore enlarge the design space for communication systems.In this paper, we have compare different digital modulation techniques and found that BPSK modulation technique is better than other modulation techniques in terms of BER. It also gives error performance of LDPC decoder over AWGN channel using Min-Sum algorithm. VLSI Architecture is proposed which uses the value re-use property of min-sum algorithm and gives high throughput. The proposed work has been implemented and tested on Xilinx Virtex 5 FPGA. The MATLAB result of LDPC decoder for low bit error rate (BER) gives bit error rate in the range of 10-1 to 10-3.5 at SNR=1 to 2 for 20 no of iterations. So it gives good bit error rate performance. The latency of the parallel design of LDPC decoder has also reduced. It has accomplished 141.22 MHz maximum frequency and throughput of 2.02 Gbps while consuming less area of the design.

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