QPSK/OQPSK Signal Detection with IF AGC on LEO Satellite

Author

Xiaoting, Chen ; Guodong, Zhao ; Ping, Jin ; Wenbin, Gong ; Huijie, Liu ; Xuwen, Liang

Author_Institution

Chinese Acad. of Sci., Shanghai

fYear

2007

fDate

16-17 Aug. 2007

Firstpage

1179

Lastpage

1182

Abstract

The effect of IF (intermediate frequency) analog AGC on QPSK/OQPSK signal detection is evaluated for LEO satellite system where Doppler drift, large dynamic range of signal power and low Eb/No condition are difficult to deal with. The way of setting reference value of logarithmic power based AGC is discussed. Coherent accumulation and non-coherent accumulation are used for detecting, while signal´s PDF and performance vs. accumulation times are derived mathematically. Experiment shows that with 60 KHz Doppler offset, Eb/No=0dB under QPSK/OQPSK, only 16 bits was consumed to detect the signal with 99.9% detection probability and 0.1% false alarm probability.

Keywords

Doppler effect; quadrature phase shift keying; satellite communication; signal detection; IF AGC; LEO satellite system; OQPSK signal detection; intermediate frequency analog AGC; noncoherent accumulation; Antennas and propagation; Detectors; Dynamic range; Frequency synchronization; Low earth orbit satellites; Microwave antennas; Microwave propagation; Quadrature phase shift keying; Satellite antennas; Signal detection; Coherent/Non-coherent Accumulation; Detection; IF AGC; LEO;

fLanguage

English

Publisher

ieee

Conference_Titel

Microwave, Antenna, Propagation and EMC Technologies for Wireless Communications, 2007 International Symposium on

Conference_Location

Hangzhou

Print_ISBN

978-1-4244-1045-3

Electronic_ISBN

978-1-4244-1045-3

Type

conf

DOI

10.1109/MAPE.2007.4393481

Filename

4393481