Performance of Blind Adaptive Multi-User Detection in Asynchronous DS-CDMA Systems
In this paper we presented the blind adaptive multiuser detector for asynchronous direct sequencecode 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 (τ<N). The system detection is synchronized only to the desired user (user 1, τ 1=0). All users have the same chip rate so the receiver requires the knowledge of the timing (bit epoch) of the desired user. We used stochastic gradient descent for adaptation rule. Computer simulation shows that the receiver convergence at 1300 iteration (bit sequence) which uses step size 0.002, SNR 10 dB for 4 asynchronous users.
Nama : Muladi1, Achmad Affandi2, Suwadi3
Email : 1elum_mlg@hotmail.com
Kategori : TELECOMMUNICATION
Institusi : 1Teknik Elektro Universitas of Malang, 2,3Teknik Elektro ITS Surabaya
