Author_Institution :
Dept. of Electron., Chiba Inst. of Technol., Narashino, Japan
Abstract :
We evaluate the phase difference distribution with and without diversity in multipath propagation by computer simulation, and find some parts theoretically. The distribution is discussed from two points of view in the time and frequency domains. In the time domain, (a) probability and cumulative density functions are derived, (b) the distribution depends on the product of fading frequency, fm, and symbol interval, Ts, (c) the cumulative value of beyond plus and minus π/4 in phase difference, p(|x|>π/4), is calculated. In the frequency domain, (a) the distribution depends on the product of subchannel bandwidth, f0, and excess delay time, τi, (b) the phase difference at a cumulative value of 50% is <2πf0τi>, and is zero off, (c) the cumulative value of p(|x|>π/4) is also calculated. Furthermore, the distribution with thermal noise is simulated. As an example of the application of the distribution, we estimate the BER of DQPSK by using the distribution, and this agrees well with the theoretical value.
Keywords :
4G mobile communication; differential phase shift keying; diversity reception; error statistics; frequency-domain analysis; mobile radio; multipath channels; quadrature phase shift keying; radiowave propagation; statistical distributions; thermal noise; time-domain analysis; BER estimation; DQPSK; adjacent channels; cumulative density function; excess delay time; fourth-generation mobile communications; frequency domain; mobile radio channels; multipath propagation; phase difference distribution; probability density function; subchannel bandwidth; symbol interval; symbol intervals; thermal noise; time domain; Amplitude modulation; Bit error rate; Fading; Frequency domain analysis; Intersymbol interference; Mobile communication; OFDM; Phase modulation; Propagation delay; Quadrature amplitude modulation;