Online SNR estimation for parallel combinatorial SS systems in Nakagami fading channels

Author

Takizawa, Ken-Ichi ; Sasaki, Shigenobu ; ZHou, Jie ; Muramatsu, Shogo ; Kikuchi, Hisakazu

Author_Institution

Dept. of Electr. & Electron. Eng., Niigata Univ., Japan

Volume

2

fYear

2002

fDate

17-21 Nov. 2002

Firstpage

1239

Abstract

In this paper, a simple and accurate online SNR estimator is proposed for parallel combinatorial SS (PC/SS) systems in Nakagami fading channels. The PC/SS systems are a kind of partial-code-parallel multicode DS/SS systems. Our proposed SNR estimator estimates the SNR at the correlator output by using a statistical ratio of the sum of correlator outputs for pre-assigned PN codes. We investigate the SNR estimation accuracy in Nakagami fading channels through computer simulations. Numerical results show that the the proposed SNR estimator brings superior estimation performance to that in conventional estimator that was proposed by Summers and Wilson (1998). In addition, we apply it to the convolutional coded PC/SS systems with iterative demodulation and decoding to evaluate the estimation performance from the viewpoint of error rate. By using our estimator, the bit error rate performance is close to the performance with perfect knowledge of the SNR information in Nakagami fading channels and correlated Rayleigh fading channels.

Keywords

Rayleigh channels; cellular radio; convolutional codes; demodulation; error statistics; iterative decoding; pseudonoise codes; spread spectrum communication; statistical analysis; Nakagami fading channels; PC/SS systems; bit error rate; computer simulations; convolutional code; correlated Rayleigh fading channels; correlator output; correlator outputs; decoding; iterative demodulation; online SNR estimation; parallel combinatorial SS systems; partial-code-parallel multicode DS/SS systems; performance; pre-assigned PN codes; statistical ratio; Additive white noise; Convolution; Convolutional codes; Correlators; Data communication; Error analysis; Error correction codes; Fading; Gaussian noise; Signal to noise ratio;

fLanguage

English

Publisher

ieee

Conference_Titel

Global Telecommunications Conference, 2002. GLOBECOM '02. IEEE

Print_ISBN

0-7803-7632-3

Type

conf

DOI

10.1109/GLOCOM.2002.1188395

Filename

1188395