Performance analysis of digital cellular radio systems in Nakagami fading and correlated shadowing environment

The bit error rate (BER) performance of digital cellular radio systems was investigated in a Nakagami fading, correlated lognormal shadowing and addit ive white Gaussian noise (AWGN) environment for noncoherent differential ph ase shift keying (DPSK) modulation, Two models were used to determine the B ER; the first one is based on the cumulative power levels of cochannel inte rferers while the second one is based on instantaneous cochannel interferen ce power. The relative advantages of the two models were presented for vari ous design parameters. The effects of bit energy to noise ratio, frequency reuse distance, cluster size, correlation coefficient, shadow spread, and f ading parameter were studied. The BER was observed to be lower in a correla ted shadowing environment compared with the uncorrelated case. The near-far effect was studied by assuming that both the desired and interfering mobil es are randomly located in their corresponding cells.