Simulation Implementation and Analysis of the OFDM Modulated by MPSK and M-QAM

2014 ◽  
Vol 543-547 ◽  
pp. 2221-2224
Author(s):  
Li Ming Yang ◽  
Jia Guo ◽  
Hong Wei Ding ◽  
Yong Wang ◽  
Yi Fan Zhao
Keyword(s):  
Bit Error Rate ◽  
Error Rate ◽  
Ofdm System ◽  
Channel Simulation ◽  
Rayleigh Channel ◽  
Simulation Results

Simulated for OFDM system modulated by 16PSK, 16QAM and 64QAM, and then we compared and analyzed their performance in the Rayleigh channel and 2 paths Rayleigh channel. Simulation results show that under the same conditions, Bit Error Rate (BER) of MQAM modulation system is lower than the same order MPSKs

A Fast Adaptive Transmit Power and Bit Allocation in OFDM System

2013 ◽  
Vol 765-767 ◽  
pp. 444-447
Author(s):  
Juan Wen ◽  
Qi Ming Tian
Keyword(s):  
Theoretical Analysis ◽  
Bit Error Rate ◽  
Error Rate ◽  
Bit Allocation ◽  
Ofdm System ◽  
Transmit Power ◽  
Allocation Algorithm ◽  
Bisection Algorithm ◽  
Simulation Results ◽  
Adaptive Transmit Power

In this paper, we propose a fast and optimal adaptive transmit power and bit allocation algorithm, which is called Bisection Searching Level (BSL) for wireless OFDMA systems. The algorithm aims at maximization of data rate under the constraints of total transmit power and bit error rate (BER). BSL is based on water pouring approach, and adopt bisection algorithm to find the water pouring level under discrete bit restriction. Both theoretical analysis and simulation results demonstrate the optimality of our proposed algorithm.

scholarly journals Bit error rate of DCO-OFDM system over an indoor diffuse link

2017 ◽  
Vol 1 (T4) ◽  
pp. 163-171
Author(s):  
Khoa Le Dang ◽  
Anh Quoc Huynh ◽  
Phuong Huu Nguyen ◽  
Linh Vu Nguyen ◽  
Hiroshi Ochi
Keyword(s):  
Bit Error Rate ◽  
Error Rate ◽  
Orthogonal Frequency Division Multiplexing ◽  
Optical Wireless Communication ◽  
Frequency Division ◽  
Optical Wireless ◽  
Ofdm System ◽  
Simulation Results ◽  
First Time ◽  
Good Agreement

The technique named DC biased orthogonal frequency division multiplexing (DCO-OFDM) is the most popular method in optical wireless communication system. In this article, we describe for the first time an exact numerical computation for the bit error rate (BER) of DCOOFDM over an indoor diffuse link. The simulation model is also provided, and simulation results showed a good agreement with theoretical analysis.

Performance Analysis of OQPSK Signals with Bi-Kappa Noise for Wireless Sensor Networks

2013 ◽  
Vol 330 ◽  
pp. 957-960
Author(s):  
Qiao Ling Du ◽  
Zhi Rui Wang ◽  
Yu Pei ◽  
Yi Ding Wang
Keyword(s):  
Wireless Sensor Networks ◽  
Sensor Networks ◽  
Performance Analysis ◽  
Error Rate ◽  
Fading Channel ◽  
Rayleigh Fading ◽  
Symbol Error Rate ◽  
Wireless Sensor ◽  
Channel Simulation ◽  
Simulation Results

This paper investigates the performance analysis of OQPSK in HF band for wireless sensor networks. An analytical model for getting symbol error rate (SER) is given in presence of Bi-Kappa noise in HF band. And the SER of OQPSK is given in AWGN and Rayleigh fading channel. Simulation results HF noise as Bi-Kappa noise should be investigated in HF band for WSN.

scholarly journals Performance Enhancement of Coherent Optical OFDM System Using LMS Algorithm

2020 ◽  
Vol 1 ◽  
pp. 1-5
Author(s):  
Manisha Bharti
Keyword(s):  
Phase Noise ◽  
Bit Error Rate ◽  
Error Rate ◽  
Orthogonal Frequency Division Multiplexing ◽  
Performance Enhancement ◽  
Lms Algorithm ◽  
Frame Structure ◽  
Least Mean Square ◽  
Ofdm Systems ◽  
Ofdm System

Instability of the local oscillator causes phase noise – a phenomenon that is a disadvantage and is considered to be a major obstacle in the functioning of coherent optical orthogonal frequency division multiplexing (CO-OFDM) systems. An attempt has been made in this paper to reduce the effects of common phase errors generated by phase noise. In this paper, a least mean square (LMS) based algorithm is proposed for estimation of phase noise. Using this proposed algorithm, the major problem of phase ambiguity caused by cycle slip is avoided and the bit error rate is greatly improved. Further, there is no requirement for modifying the frame structure of OFDM using this algorithm. A CO-OFDM system with the 8-PSK technique is used to implement the algorithm concerned. Furthermore, the algorithm, using the 8-PSK modulation technique, is analyzed and compared with the existing QPSK technique and with other algorithms. The investigations reveal that 8-PSK outperforms existing LMS algorithms using other techniques and significantly reduces the bit error rate.

Bit Error Rate Performance Analysis of Hybrid Subcarrier Intensity Modulation-Based FSO with Spatial Diversity in Various Weather Conditions

2019 ◽  
Vol 40 (3) ◽  
pp. 307-314 ◽  
Author(s):  
Rajat Kumar Giri ◽  
Bijayananda Patnaik
Keyword(s):  
Bit Error Rate ◽  
Error Rate ◽  
Weather Conditions ◽  
Spatial Diversity ◽  
Intensity Modulation ◽  
Free Space Optical ◽  
Diversity Techniques ◽  
Link Distance ◽  
Simulation Results ◽  
Improved Performance

Abstract In this paper, we study the performance improvement of free space optical (FSO) communication system with spatial diversity techniques employing hybrid pulse position modulation-binary phase shift keying-subcarrier intensity modulation (PPM-BPSK-SIM). The involvement of multiple photo-detectors in diversity based FSO systems offers an effective way to overcome scntillation. In this paper, we have simulated the bit error rate (BER) with respect to different parameters like average SNR, link distance at various weather conditions. The simulation results are verified in Matlab environment with the mathematical analysis. The simulation results show that higher order single input multiple output (SIMO) system achieves better BER performance and hybrid PPM-BPSK-SIM has significant improved performance than the common modulation schemes like PPM, BPSK-SIM.

scholarly journals A Generalized Bit Error Rate Evaluation for Index Modulation Based OFDM System

IEEE Access ◽  
2020 ◽  
Vol 8 ◽  
pp. 70082-70094 ◽  
Author(s):  
Mahmoud Abdullahi ◽  
Aijun Cao ◽  
Adnan Zafar ◽  
Pei Xiao ◽  
Ibrahim A. Hemadeh
Keyword(s):  
Bit Error Rate ◽  
Error Rate ◽  
Ofdm System ◽  
Rate Evaluation ◽  
Index Modulation

Performance Comparison of LS and LMMSE Channel Estimation Algorithm for CO-OFDM System

2011 ◽  
Vol 130-134 ◽  
pp. 2965-2968
Author(s):  
Zheng Rong Tong ◽  
Min Jie Guo ◽  
Xiu Feng Yang ◽  
Wei Hua Zhang
Keyword(s):  
Optical Fiber ◽  
Bit Error Rate ◽  
System Performance ◽  
Single Mode ◽  
Estimation Algorithm ◽  
Performance Comparison ◽  
Ofdm System ◽  
Fiber System ◽  
Single Mode Optical Fiber ◽  
Simulation Results

The CO-OFDM single-mode optical fiber system is constructed by the Matlab coupled with the Optisystem. And the influence of different channel algorithm on the receiver of system is researched. The simulation results show that the system performance is improved by using LS or LMMSE channel algorithm. And the LMMSE channel algorithm can provide better performance than the LS channel algorithm. Compared with LS algorithm, the required receiver OSNR is reduced by about 1 dB using improved LMMSE algorithm at bit-error-rate (BER) =10-4 in the CO-OFDM single-mode optical fiber system.

Rate-Compatible Punctured Ring Convolutional Coded Continuous Phase Modulation

2012 ◽  
Vol 195-196 ◽  
pp. 217-220
Author(s):  
Lei Zhang ◽  
Man Ping Tong ◽  
Hong Bo Wang
Keyword(s):  
Bit Error Rate ◽  
Error Rate ◽  
Phase Modulation ◽  
Euclidean Distance ◽  
Convolutional Codes ◽  
Continuous Phase ◽  
Transmission Efficiency ◽  
Continuous Phase Modulation ◽  
Simulation Results ◽  
Squared Euclidean Distance

In this paper, continuous phase modulation (CPM) with rate-compatible punctured ring convolutional codes is investigated. Some typical schemes with maximum normalized minimum squared euclidean distance (NMSED) are searched and given. The performance of bit error rate for rate-compatible punctured ring convolutional coded CPM on AWGN channel is simulated, and simulation results show that this system can provide good performance of bit error rate and variable-rate capabilities. Furthermore, simulation results also prove that the transmission efficiency increases when code rate is decreasing.

A Novel Construction Method of QC-LDPC Codes Based on Generalized ACE Constrained

2013 ◽  
Vol 760-762 ◽  
pp. 1684-1689
Author(s):  
Hong Hao Zhao ◽  
Fan Bo Meng ◽  
Qing Qi Zhao ◽  
Jie Wang
Keyword(s):  
Computational Complexity ◽  
Bit Error Rate ◽  
Error Rate ◽  
Ldpc Codes ◽  
Excellent Performance ◽  
Frame Error Rate ◽  
Signal Noise ◽  
Extrinsic Message Degree ◽  
Lower Complexity ◽  
Simulation Results

Recently, structured LDPC codes have been focused on due to excellent performance and lower complexity. An improved construction of QC-LDPC based on a modified PEG algorithm is proposed in this paper. The modified Progressive Edge-Growth algorithm is a PEG algorithm with Approximated Cycle Extrinsic Message Degree (ACE) metric, which is used to describe the connectivity of cycles. The approach can maximize the girth of the cycles, improve the connectivity of cycles and have the advantages of QC algorithms. The simulation results demonstrate that the PEG algorithm based on ACE has lower Bit Error Rate (BER) and Frame Error Rate (FER) than the original PEG algorithm at the low Signal Noise Ratio (SNR) values, and has a relatively lower computational complexity.

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