Analysis of the Comparison of OFDM and WPM in the Communication System

2012 ◽  
Vol 198-199 ◽  
pp. 1794-1799
Author(s):  
Na Li ◽  
Xian Jun Gao ◽  
Xue Hao
Keyword(s):  
Frequency Domain ◽  
Bit Error Rate ◽  
Error Rate ◽  
Communication System ◽  
Two Systems ◽  
Simulation Results ◽  
And Performance ◽  
Ofdm Signals ◽  
Wimax System

The fundamental theories of OFDM and WPM have many similarities in their functions and performance but there are some significant differences which give two systems to be distinctive. OFDM signals only overlap in the frequency domain while the wavelet signals overlap in both time and frequency domain. In the paper, WPM instead of conventional OFDM is used in WIMAX system. The simulation results show the WPM on WIMAX has lower bit error rate compare to conventional OFDM WIMAX.

scholarly journals Performance Evaluation of Downlink WiMAX System in Vicinity of UWB System

2011 ◽  
Vol 7 (2) ◽  
pp. 120-124
Author(s):  
Maan Al-Adwany
Keyword(s):  
Performance Evaluation ◽  
Bit Error Rate ◽  
Error Rate ◽  
Office Building ◽  
Transmitted Power ◽  
Minimum Requirements ◽  
Downlink System ◽  
Simulation Results ◽  
Wimax System

In this paper, we evaluate the performance of WiMAX downlink system in vicinity of UWB system. The study is achieved via simulating a scenario of an office building which utilizes from both WiMAX and UWB appliances. From the simulation results, we found that WiMAX system is largely affected by the UWB interference. However, in order to overcome the interference problem and achieve reasonable BER (Bit Error Rate) of 10-4, we found that it is very necessary to raise the WiMAX transmitted power in relative to that of UWB interferer. So, the minimum requirements for WiMAX system to overcome UWB interference are stated here in this work.

A Multiaddress Co-Chaos Shift Keying Communication Scheme and Performance Analysis

2014 ◽  
Vol 24 (04) ◽  
pp. 1450050
Author(s):  
Zhiliang Zhu ◽  
Jingping Song ◽  
Yanjie Song ◽  
Hai Yu
Keyword(s):  
Bit Error Rate ◽  
Error Rate ◽  
Gaussian White Noise ◽  
Transmission Efficiency ◽  
Theory Analysis ◽  
Shift Keying ◽  
Communication Scheme ◽  
Simulation Results ◽  
And Performance ◽  
Chaos Shift Keying

A new multiaddress Co-Chaos Shift keying communication scheme (MA-CoCSK) was proposed based on analyzing the permutation-based differential chaos-shift-keying (PMA-DCSK) scheme and the Antipodal Chaos-Shift-Keying (ACSK) scheme. We also analyzed the bit error rate of the new scheme in Gaussian white noise channel and compared its performance with that of the PMA-DCSK scheme. Theory analysis and simulation results both indicate that the scheme proposed in this paper can not only improve the transmission efficiency of a communication system, but also decrease the bit error rate significantly while increasing the speed compared to PMA-DCSK.

Simulation and Performance Analysis of FH Spread Spectrum Communication System under Repeater Jamming

2012 ◽  
Vol 195-196 ◽  
pp. 744-747
Author(s):  
Yu Zhang ◽  
Zhi Qiang Sun ◽  
Ji Hua Lu ◽  
Jian Ping An
Keyword(s):  
Performance Analysis ◽  
Theoretical Analysis ◽  
Bit Error Rate ◽  
Error Rate ◽  
Spread Spectrum ◽  
Communication System ◽  
Frequency Hopping ◽  
Spread Spectrum Communication ◽  
Rate Performance ◽  
And Performance

In this paper, a model of FH spread spectrum communication system has been built in Matlab/Simulink platform. Theoretical analysis of repeater jamming are derived. These limitations arise because of the geometry and so on. Then, we analyze the bit error rate performance in FH communication system under repeater jamming. The benefits of frequency hopping are potentially neutralized by a repeater jammer.

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.

Construction Method of Virtual Network Communication System Based on UDP Protocol

2014 ◽  
Vol 687-691 ◽  
pp. 3818-3821
Author(s):  
Zhi Zhang
Keyword(s):  
Service Quality ◽  
Error Rate ◽  
Data Transmission ◽  
Communication System ◽  
Construction Method ◽  
Virtual Network ◽  
Network Communication ◽  
Communication Problems ◽  
Simulation Results

The virtual network communication system and its construction method is researched, the service quality of the virtual network communication is improved. In view of the virtual network communication problems, the construction method of virtual network communication system is proposed based on UDP protocol. The communication system, it needs to build the UDP protocol. The protocol is taken as the virtual network communication platform, and the data transmission of virtual network communication is completed. Simulation results show that the improved algorithm is applied in the virtual network communication, the virtual network communication system is constructed, and the error rate can be effectively reduced, the efficiency of communication is improved, and it can meet the actual needs of users.

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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