A NOVEL DIGITAL FM-RECEIVER FOR MOBILE AND PERSONAL COMMUNICATIONS

Recently, a digital baseband receiver called zero-intermediate frequen cy zero-crossing demodulator (ZIFZCD) was developed for digital FM sig nal detection. ZIFZCD is applicable to many worldwide mobile and perso nal communications systems. In addition, ZIFZCD offers lower power con sumption and simpler implementation, compared to the conventional anal og implementation [e.g., a limiter-discriminator integrator and dump ( LDI)] and the conventional digital implementation [e.g., the cross-dif ferentiate-multiply demodulator (CDM)]. An objective of this paper is to introduce the ZIFZCD and report the bit-error rate (BER) of the ZIF ZCD under both static and fading environments. The analyzed and simula ted BER results show that the ZIFZCD is comparable to the conventional CDM for a narrowband digital FM with modulation index 0.5, and the ZI FZCD is significantly better than the CDM for a wideband digital FM wi th modulation index larger than 1.5.