Title :
On the error rates of differentially detected narrowband π/4-DQPSK in Rayleigh fading and Gaussian noise
Author :
Ng, Chun Sum ; Tjhung, Tjeng Thiang ; Adachi, Fumiyuki ; Lye, Kin Mun
Author_Institution :
Dept. of Electr. Eng., Nat. Univ. of Singapore, Singapore
fDate :
8/1/1993 12:00:00 AM
Abstract :
Closed-form formulas for the probability density function (PDF) and cumulative distribution function (CDF) of the differential phase of a phase-modulated carrier in Rayleigh-fading and correlated noise is derived and applied to evaluate the bit-error-rate (BER) of π/4-DQPSK and conventional DQPSK (differential quaternary phase-shift keyed) systems. Under very narrow IF band-limitation and at high SNR, the π/4-DQPSK outperforms the conventional DQPSK because the former has less spectral splatter during phase transitions between symbol. The performances of these two systems approach one another as the bandwidth parameter BT increases
Keywords :
cellular radio; digital radio systems; error statistics; fading; phase shift keying; random noise; π/4-DQPSK; BER; DQPSK; Gaussian noise; Rayleigh fading; bit-error-rate; cellular radio; closed-form expression; correlated noise; cumulative distribution function; differential detection; differential phase; differential quaternary phase-shift keyed; narrowband IF filter; phase-modulated carrier; probability density function; spectral splatter; AWGN; Additive white noise; Bit error rate; Error analysis; Frequency; Gaussian noise; Intersymbol interference; Narrowband; Phase noise; Rayleigh channels;
Journal_Title :
Vehicular Technology, IEEE Transactions on
