Title :
An adaptive soft output demodulator for low BT GMSK signals
Author :
Wu, Jie ; Saulnier, Gary J.
Author_Institution :
Dept. of Electr. Comput. & Syst. Eng., Rensselaer Polytech. Inst., Troy, NY, USA
Abstract :
This paper investigates a convolutional-coded system with GMSK signaling where the bandwidth-time product (BT) value is much smaller than the value used in most previous research. An adaptive soft output demodulator is proposed. Significant complexity reduction is achieved without performance loss, by using differential precoding, the Laurent (1986) signal representation and sampling the received symbols at the end of the symbol duration. The performance of the demodulator is studied in AWGN and slow flat Rayleigh fading channels through simulations.
Keywords :
AWGN channels; Rayleigh channels; adaptive systems; convolutional codes; demodulators; minimum shift keying; signal representation; signal sampling; AWGN channels; GMSK signaling; Laurent signal representation; Laurent signal sampling; adaptive soft output demodulator; bandwidth-time product; complexity reduction; convolutional-coded system; differential precoding; low BT GMSK signals; simulations; slow flat Rayleigh fading channels; symbol duration; Convolution; Convolutional codes; Demodulation; Least squares approximation; Linear approximation; Maximum likelihood estimation; Modulation; Performance loss; Sampling methods; Signal representations;
Conference_Titel :
Vehicular Technology Conference, 2002. Proceedings. VTC 2002-Fall. 2002 IEEE 56th
Print_ISBN :
0-7803-7467-3
DOI :
10.1109/VETECF.2002.1040398
