Abstract
The outdoor transmission channels condition in multiple wireless signals systems changes continuously due to signals transfer path characteristics. The path loss, multiple reflected rays Rayleigh fading and shadowing presents an important factor that effects inconsistent with signals propagation through the wireless channels of communication systems. The solutions for these effects will contribute to minimize the error probability of transferred data and maximize the data rate in high speed systems. This paper deals with the analysis of error probability using Probability density function (PDF) model of Signal to Noise ratio (SNR) for different values of transmitted signals power at outdoor receiver of multi users systems. The proposed approach use Rayleigh fading channels, 2GHz carrier frequency, (0-30) dB SNR, (0.1,0.2,0.3), (1,2,3) and (10,20,30) PW. The relationship between error probability and SNR has been studied to determine efficient transmission channels. The proposed channel model has been simulated and analyzed using MATLAB R2012b software under different users power signals values. The obtained results have showed accuracy as well as efficiency of the proposed method where the error probability is decrease when the SNR increase and the error probability decrease when decrease in the transmitted power signal.
Highlights
The performance improvement in wireless communications environment is paramount important due to increase use in mobile phones, internet services, intranet and Bluetooth
SIMULATION RESULTS The obtained simulation results represent the error probability analysis using approximate Probability density function (PDF) form based on Signal to Noise ratio (SNR) related to Rayleigh fading-shadowing channel in multi-users wireless mobile communication systems
It is clear that the simulation result is closer to reference results especially when the signal power equal to 1 and 2 which is equivalent to 30 and 33.010299957 dBm respectively which are used in the 3G wireless universal mobile telecommunication system (UMTS) and global system for mobile communications (GSM)
Summary
The performance improvement in wireless communications environment is paramount important due to increase use in mobile phones, internet services, intranet and Bluetooth. Where the PU is the transmit power for uth user , σUi ,b is the distance that the path loss and the shadowing effect relying on it , Hji,U presents the Tx × Rx channel matrix of Rayleigh fading coefficients matrix between ith and jth transmit and receive antennas respectively.
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