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ITS » Master Theses » Teknik Kes & Keselamatan Kerja
Posted by erna at 08/01/2007 11:18:38  •  5990 Views


KINERJA BLIND ADAPTIVE MULTIUSER DETECTOR PADA SISTEM DSCDMA ASINKRON

Author :
MULADI  




ABSTRAK

Pada tesis ini dilakukan penelitian pada kinerja blind adaptive multiuser detector yang digunakan pada sistem komunikasi direct sequence-code division multiple access CDMA dengan kanal AWGN additive white gaussian noise. Metode transmisi asinkron adalah jenis chip sinkron bit asinkron sehingga delay pengguna lebih kecil dari panjang kode spreading LambdaN. Sistem deteksi disinkronkan ke pengguna yang diinginkan pengguna 1 Ti0 dan menggunakan teknik one-shot berdasarkan kriteria minimum output energi MOE yang sama dengan kriteria minimum mean square of error MMSE. Semua pengguna diasumsikan menggunakan laju bit yang sama sehingga penerima memerlukan pengetahuan timing bit epoch dari pengguna yang diinginkan. Algoritma least mean square LMS digunakan sebagai aturan adaptasi komponen orthogonal. Kinerja detektor yang didesain dibandingkan dengan detektor konvensional dan detektor adaptif blind untuk metode transmisi asinkron. Hasil simulasi menunjukkan bahwa detektor yang dirancang bersifat near-far resistance dan kinerja dari probabilitas kesalahan bit tidak jauh berbeda dengan detektor adaptive blind sinkron. Dengan menggunakan kontrol daya sempurna detektor mencapai nilai Pe10-5 pada SNR14 dB. Simulasi komputer juga menunjukkan bahwa algoritma adaptif blind mencapai konvergen pada iterasi ke-1300 dengan menggunakan step size 0002 SNR 10 dB dengan 4 pengguna.


ABSTRACT

In this thesis we presented our research at the blind adaptive multiuser detector for asynchronous direct sequence-code division multiple access with additive white gaussian AWG channel. Asynchronous transmission method is bit asynchronous but chip synchronous so the delay of the users are not exceed the length of the spreading code LambdaN. The detection system is synchronized only to the desired user user 1 Ti0. All users have the same chip rate so the receiver requires the knowledge of the timing bit epoch of the desired user. We used least mean square LMS for adaptation rule. This algorithm has low computational complexity but slow to convergence. The detector performance compared with the case of a linear one-shot multiuser receiver is employed. Numerical result shows that the proposed receiver is near-far resistance and the performance of probability of error not far from blind adaptive detector for synchronous case. Computer simulation shows that the receiver convergence at about 1300 iteration bit sequence which uses step size 0.002 SNR 10 dB for 4 asynchronous users. Assumed that channel is single-path.



KeywordsDS-CDMA asinkron; detektsi multiuser
 
Contributor
  1. DR.IR. ACHMAD AFFANDI, D.E.A IR. SUWADI, M.T.
Date Create: 08/01/2007
Type: Text
Format: pdf;79 pages
Language: Indonesian
Identifier: ITS-Master-3100003017647
Collection ID: 3100003017647
Call Number: 621.384 56 Mul


Source
Theses Teknik Kes & Keselamatan Kerja RT 621.384 56 Mul, 2002

Coverage
ITS Community

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Copyright @2005 by ITS Library. This publication is protected by copyright and permission should be obtained from the ITS Library prior to any prohibited reproduction, storage in a retrievel system, or transmission in any form or by any means, electronic, mechanical, photocopying, recording, or likewise. For information regarding permission(s), write to ITS Library




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