Title :
Equal-gain combining of multichannel DPSK in Doppler-spread Ricean fading
Author :
Ziemer, Rodger E. ; Welch, Thad B.
Author_Institution :
Dept. of Electr. & Comput. Eng., Colorado Univ., Colorado Springs, CO, USA
fDate :
9/1/2000 12:00:00 AM
Abstract :
A method for computing the bit error probability (BEP) of multichannel differentially coherent phase-shift keying (DPSK) with equal gain combining in Doppler spread Ricean fading is given. It is based on Gauss-Chebyshev quadrature integration of the moment generating function of the decision statistic at the combiner output. The method allows nonuniform power delay profiles for the received multipath rays. Applications to multicarrier spread spectrum modulation and spread spectrum with RAKE reception systems are discussed. It is found that for moderate values of the Ricean K-factor (ratio of specular to diffuse fading signal power) an optimum order of diversity exists whereas, for large K-factors, diversity does not improve performance
Keywords :
Doppler effect; Rician channels; cellular radio; differential phase shift keying; diversity reception; error statistics; integration; multipath channels; radar receivers; spread spectrum communication; BEP; Doppler-spread Ricean fading; Gauss-Chebyshev quadrature integration; K-factors; RAKE reception systems; Ricean K-factor; bit error probability; decision statistic; diversity; equal-gain combining; moment generating function; multicarrier spread spectrum modulation; multichannel DPSK; multichannel differentially coherent phase-shift keying; nonuniform power delay profiles; performance; received multipath rays; Computer vision; Delay; Differential quadrature phase shift keying; Diversity reception; Error probability; Fading; Gaussian processes; Rayleigh channels; Spread spectrum communication; Statistics;
Journal_Title :
Vehicular Technology, IEEE Transactions on
