scholarly journals Analisa Unjuk Kerja Sistem Downlink Dedicated Channel (DCH) Pada Wideband CDMA

2019 ◽  
Vol 16 (1) ◽  
pp. 17
Author(s):  
Rullyanto Rullyanto ◽  
Mohamad Fathoni
Keyword(s):  
Bit Error Rate ◽  
Error Rate ◽  
Channel Coding ◽  
Multipath Fading ◽  
Control Channel ◽  
Wideband Cdma ◽  
Cyclic Redundancy Check ◽  
Code Division Multiple

Sistem seluler Wideband Code Division Multiple Acces (WCDMA) saat ini berkembang sangat pesat pada tugas akhir ini dilakukan Analisa Unjuk Kerja Sistim Downlink Dedicated Channel (DCH) pada Wideband CDMA. Untuk menganalisa performa atau unjuk kerja dari sistem Downlink DCH pada Wideband CDMA dicari nilai kesalahan bit pada saat pengiriman yang biasa dikenal dengan nama Bit Error Rate pada Cyclic Redundancy Check (CRC) dan channel coding dengan input Dedicated Traffik Channel (DTCH) dan Dedicated Control Channel (DCCH) dicari nilai Bit Error Rate (BER) pada sistem Downlink Dedicated Channel (DCH) Wideband CDMA dan dicari nilai Block Error Rate (BLER) pada sistem Downlink Dedicated Channel (DCH) Wideband CDMA. Analisa ini menggunakan piranti lunak Matlab 7.0.1 untuk mengetahui jumlah kesalahan Bit Error Rate (BER) dengan jenis kanal Multipath Fading. Dari hasil simulasi dengan Input 106 pada 7 dB dengan menggunakan Eb/No dari 1 hingga 7 dB maka didap atkan Bit Error Rate dengan nilai Bit Error Rate BER 1,8 x 10^-6.

Design and Simulation of OFDM System Based on Matlab

2014 ◽  
Vol 635-637 ◽  
pp. 1081-1085
Author(s):  
Xin Xin Sha ◽  
Jian Zhou ◽  
Yuan Xue Song
Keyword(s):  
Bit Error Rate ◽  
Error Rate ◽  
Channel Coding ◽  
Signal To Noise Ratio ◽  
Average Power ◽  
System Structure ◽  
Power Ratio ◽  
Basic System ◽  
Ofdm System ◽  
Signal To Noise

OFDM is a key modulation and multiplexing technique. The basic system structure of OFDM is introduced firstly. This paper chose appropriate implementation schemes for channel coding, PAPR(Peak To Average Power Ratio) reducing and synchronization of the OFDM system based on the minimum BER(Bit Error Rate). Finally, the paper realized the simulation and got the BER in different SNR(Signal To Noise Ratio) in the matlab environment .

scholarly journals Reliable, Efficient, and Power Optimized Control-Channel Selection Scheme for Cognitive Radio Networks

2013 ◽  
Vol 2013 ◽  
pp. 1-14 ◽  
Author(s):  
Saleem Aslam ◽  
Adnan Shahid ◽  
Kyung Geun Lee
Keyword(s):  
Cognitive Radio ◽  
Cognitive Radio Networks ◽  
Bit Error Rate ◽  
Error Rate ◽  
Channel Selection ◽  
Radio Networks ◽  
Control Channel ◽  
Centralized Control ◽  
Channel Switching ◽  
Selection Scheme

This paper presents a centralized control-channel selection scheme for cognitive radio networks (CRNs) by exploiting the variation in the spectrum across capacity, occupancy, and error rate. We address the fundamental challenges in the design of the control-channel for CRNs: (1) random licensed users (LUs) activity and (2) the economical and vulnerability concerns for a dedicated control-channel. We develop a knapsack problem (KP) based reliable, efficient, and power optimized (REPO) control-channel selection scheme with an optimal data rate, bit error rate (BER), and idle time. Moreover, we introduce the concept of the backup channels in the context of control-channel selection, which assists the CRs to quickly move on to the next stable channel in order to cater for the sudden appearance of LUs. Based on the KP and its dynamic programming solution, simulation results show that the proposed scheme is highly adaptable and resilient to random LU activity. The REPO scheme reduces collisions with the LUs, minimizes the alternate channel selection time, and reduces the bit error rate (BER). Moreover, it reduces the power consumed during channel switching and provides a performance, that is, competitive with those schemes that are using a static control-channel for the management of control traffic in CRNs.

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>

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