Bit error rate reduction scheme for direct sequence CDMA in a Rayleigh fading environment

1997 ◽  
Vol 33 (13) ◽  
pp. 1113
Author(s):  
Tai-Kuo Woo
Keyword(s):  
Bit Error Rate ◽  
Error Rate ◽  
Rayleigh Fading ◽  
Direct Sequence ◽  
Reduction Scheme ◽  
Rate Reduction

Bit error rate reduction of optical communication by means of Tip/Tilt correction

2018 ◽  
Vol 429 ◽  
pp. 152-157 ◽  
Author(s):  
Neda Shamsipour ◽  
Abolhasan Mobashery ◽  
Mohammad Moradi
Keyword(s):  
Optical Communication ◽  
Bit Error Rate ◽  
Error Rate ◽  
Rate Reduction ◽  
Tilt Correction

scholarly journals Perbandingan Nilai Bit Error Rate Penyandi Turbo Konvolusional, Turbo Block dan Gabungan

2019 ◽  
Vol 18 (01) ◽  
pp. 39-49
Author(s):  
Eva Yovita Dwi Utami ◽  
Ruth Johana Angelina ◽  
Andreas Ardian Febrianto
Keyword(s):  
Bit Error Rate ◽  
Error Rate ◽  
Rayleigh Fading

Pada sistem komunikasi digital, dibutuhkan sistem penyandian kanal yang berfungsi untuk meminimalkan efek kerusakan atau hilangnya informasi yang diakibatkan oleh derau di dalam kanal. Sistem penyandian kanal yang baik memiliki nilai Bit Error Rate (BER) yang kecil. Penyandi Turbo merupakan salah satu teknik penyandian kanal pengoreksi galat dengan penggunaan dua sandi komponen yang dihubungkan secara paralel baik pada penyandi maupun pengawasandi. Pada penelitian ini, dilaporkan perbandingan nilai BER beberapa jenis Penyandi Turbo yang terdiri dari Turbo Konvolusional, Turbo Block dan Turbo Gabungan berdasarkan jumlah iterasi yang dilakukan, efek puncturing  serta kanal yang dilalui oleh isyarat dari pengirim menuju penerima. Dari hasil simulasi, secara umum Turbo konvolusional memiliki kinerja yang paling baik dibandingkan dengan Turbo Block dan Turbo Gabungan pada setiap nilai iterasi, pada data tersandi dengan dan tanpa efek puncturing maupun pada setiap kanal yang dilewati. Kinerja BER semua jenis penyandi mengalami perbaikan ketika proses iterasi ditingkatkan. Sementara itu efek puncturing akan menurunkan kinerja Penyandi Turbo. Pada kanal AWGN, Turbo Konvolusional dapat mencapai nilai BER sebesar 0 saat Eb/N0 = 2 dB sedangkan Turbo Gabungan dan Turbo Block hanya mencapai 0,0087 dan 0,0155. Pada kanal berderau AWGN yang ditambah multipath Rayleigh fading, Turbo Konvolusional  pada Eb/N0 = 2 dB tetap memiliki kinerja yang paling baik dengan nilai BER  sebesar 0,0114 sementara Turbo Gabungan dan Turbo Block dengan nilai BER 0,0458 dan 0,0163.

scholarly journals THE STUDY OF BIT ERROR RATE EVOLUTION IN A MOBILE COMMUNICATIONS SYSTEM USING DS – CDMA TECHNOLOGY

2017 ◽  
Vol 18 (2) ◽  
Author(s):  
ION POPA
Keyword(s):  
Mobile Communications ◽  
Bit Error Rate ◽  
Error Rate ◽  
Code Division Multiple Access ◽  
Additive White Gaussian Noise ◽  
Direct Sequence ◽  
Access Technology ◽  
M Sequence ◽  
Code Division Multiple ◽  
Communications System

<p>This paper follows the study of bit error rate evolution in a mobile communications system using DS – CDMA (Direct Sequence – Code Division Multiple Access) technology. We have assessed the bit error rate (BER) based on the signal/noise ratio, Eb/N0, and the number of users in the system. For this purpose, we have used M sequence and Orthogonal Gold sequence and the AWGN (Additive white Gaussian noise) transmission medium<strong>.</strong></p>

scholarly journals Bit Error Rate Performance of Spread Spectrum Communication Systems for AWGN Channels

2020 ◽  
Vol 9 (3) ◽  
pp. 277-280
Keyword(s):  
Bit Error Rate ◽  
Error Rate ◽  
Spread Spectrum ◽  
Communication Systems ◽  
Digital Communication ◽  
Additive White Gaussian Noise ◽  
Direct Sequence Spread Spectrum ◽  
Rate Performance ◽  
Direct Sequence ◽  
Spread Spectrum Systems

The digital communication technologies have gained immense significance as it provides secure and error free services. One of the major advantages of digital communication is that they are much resistant to transmitted as well as interpreted errors. For ensuring the security of data, the most suitable method is to use spread spectrum technique. The spread spectrum technique has gained immense popularity for use in various systems as the spreading of the spectral bandwidth offer many advantages, including the establishment of secure communications, increasing resistance to interference, noise rejection, and so on. The signals which are modulated by using these techniques cannot be jammed and are very hard to interfere. This paper presents the results of investigation of BPSK based direct sequence spread spectrum systems for Additive White Gaussian Noise (AWGN) and undersea channels. The bit error rate performance of BPSK based direct sequence spread spectrum systems has been simulated for the AWGN channel and the results have been plotted.

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