Abstract :
A formula is derived for the error probability of M-ary differential phase-shift keying with differential phase detection in a two-path Rayleigh fading channel taking into account adjacent channel interference (ACI), cochannel interference (CCI), intersymbol interference (ISI), and Doppler frequency shift. Square-root Nyquist filters are used with roll-off, β, the transmitter and receiver as in the proposed US digital mobile radio system. The presence of the second path has a profound effect on increasing the bit error probability (BEP) because it causes ISI. In the absence of ISI, ACI has a smaller effect on BEP than CCI. In the presence of ISI their effect is essentially the same. For a given bit energy-to-noise ratio, the binary system has the lowest BEP; however, the bit rate is also the lowest for a given bandwidth. When the main interference is ACI or CCI, a quaternary system has a lower BEP than the octal system. When the main interference is ISI, this is reversed
Keywords :
digital radio systems; fading; interference (signal); intersymbol interference; mobile radio systems; phase shift keying; DPSK; Doppler frequency shift; M-ary differential phase-shift keying; US digital mobile radio; adjacent channel interference; binary system; bit error probability; cochannel interference; differential phase detection; energy-to-noise ratio; filter roll-off; intersymbol interference; land mobile radio; octal system; quaternary system; square root Nyquist filters; two-path Rayleigh fading channel; Differential phase shift keying; Digital filters; Error probability; Fading; Frequency shift keying; Interchannel interference; Intersymbol interference; Phase detection; Radiofrequency interference; Rayleigh channels;
