Title :
Differentially coherent demodulation for differential BPSK in spread spectrum systems
Author_Institution :
Lehrstuhl fur Nachrichtentech., Erlangen-Nurnberg Univ., Germany
fDate :
9/1/1999 12:00:00 AM
Abstract :
A demodulator for differential phase-shift keying is proposed, which outperforms significantly the noncoherent receiver. It is based on coherent demodulation with decision-directed channel estimation followed by differential demodulation. The metric for maximum-likelihood decoding is derived. The performance is estimated for spread spectrum communication on frequency-selective Rayleigh fading channels. It is demonstrated that the proposed demodulator is attractive in particular for systems with low maximum Doppler frequency
Keywords :
Rayleigh channels; code division multiple access; demodulation; maximum likelihood decoding; phase shift keying; spread spectrum communication; Doppler frequency; coherent demodulation; decision-directed channel estimation; differential BPSK; differential demodulation; differential phase-shift keying; differentially coherent demodulation; frequency-selective Rayleigh fading channel; maximum-likelihood decoding; performance; spread spectrum communication; spread spectrum systems; Binary phase shift keying; Bit error rate; Convolutional codes; Demodulation; Differential phase shift keying; Differential quadrature phase shift keying; Fading; Maximum likelihood decoding; Multiaccess communication; Spread spectrum communication;
Journal_Title :
Vehicular Technology, IEEE Transactions on
