PERFORMANCE ANALYSIS OF CODE DIVISION MULTIPLE ACCESS SYSTEM TRANSlVIITTED THROUGH NONLINEAR MOBILE SATELLITE CHANNEL
Mohamed Ghaleb Mayhoub;
Abstract
'Mohamed Gl aleb Mayhoub. Performance analysis of code division
'multiple access system transmitted through nonlinear mobile satellite channel. Doctor of Philosophy Degree, Ain Shams University. Facuity of Engineering. Electronics and Communication Eng. Dept.
This work introduces two important subjects. The first one studies, the perfonnance analysis for one user of the direct sequence spread spectnnn (DS-SS) sib'llal transmission through nonlinear mobile satellite channel, while the second one introduces the performance analysis for multi-user of the direct sequence code division_multiple access (DS CDMA) sib'IJal transmission through nonlinear mobile satellite channel.
The perfonnance of DS-CDMA system, is performed using an analytical model with both Gaussian process (GA) and improved Gaussian approximation (IGA). Because of the inaccuracy of the Gaussian approximation for the multiple access interference (MAl), an improved Gaussian process with good accuracy has been used.
The impainnents taken into consideration in the system are nonlinear effect of travelling wave tube (TWTA) on-board satellite (AM to-AM and AM-to-PM conversions), additive white Gaussian noise (AWGN), multiple access interference, and mobile propagation channels which includes Shadowing, Rician, and Rayleigh effects, to describe propagation in suburban, open, and urban areas respectively. System performance in tenus of the error probability is explored.
Also, a computer modelling and simulation is done for direct sequence spread spectrum for one user, and for direct sequence code division multiple access for multi-user, with the impairment as mentioned above.
Two teclmiques for the perfonnance evaluation in computer simulation have been used, Monte Carlo simulator and an importance sampling teclmiques.
After the verification of simulation results with the obtained results of analytical model, the simulation model is extended with considering the up-link noise, in addition to the impairment taken in the analytical analysis.
'multiple access system transmitted through nonlinear mobile satellite channel. Doctor of Philosophy Degree, Ain Shams University. Facuity of Engineering. Electronics and Communication Eng. Dept.
This work introduces two important subjects. The first one studies, the perfonnance analysis for one user of the direct sequence spread spectnnn (DS-SS) sib'llal transmission through nonlinear mobile satellite channel, while the second one introduces the performance analysis for multi-user of the direct sequence code division_multiple access (DS CDMA) sib'IJal transmission through nonlinear mobile satellite channel.
The perfonnance of DS-CDMA system, is performed using an analytical model with both Gaussian process (GA) and improved Gaussian approximation (IGA). Because of the inaccuracy of the Gaussian approximation for the multiple access interference (MAl), an improved Gaussian process with good accuracy has been used.
The impainnents taken into consideration in the system are nonlinear effect of travelling wave tube (TWTA) on-board satellite (AM to-AM and AM-to-PM conversions), additive white Gaussian noise (AWGN), multiple access interference, and mobile propagation channels which includes Shadowing, Rician, and Rayleigh effects, to describe propagation in suburban, open, and urban areas respectively. System performance in tenus of the error probability is explored.
Also, a computer modelling and simulation is done for direct sequence spread spectrum for one user, and for direct sequence code division multiple access for multi-user, with the impairment as mentioned above.
Two teclmiques for the perfonnance evaluation in computer simulation have been used, Monte Carlo simulator and an importance sampling teclmiques.
After the verification of simulation results with the obtained results of analytical model, the simulation model is extended with considering the up-link noise, in addition to the impairment taken in the analytical analysis.
Other data
| Title | PERFORMANCE ANALYSIS OF CODE DIVISION MULTIPLE ACCESS SYSTEM TRANSlVIITTED THROUGH NONLINEAR MOBILE SATELLITE CHANNEL | Other Titles | تحليل اداء نظم الدخول المتعدد المكود عند العمل فى قنوات الاتصال اللآخطية بالاقمار الصناعية للمحطات المتحركة | Authors | Mohamed Ghaleb Mayhoub | Issue Date | 1998 |
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