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This paper investigates the performance of digital implementation of dual antenna phase diversity system utilizing the Constant Modulus Algorithm (CMA) and Maximal Ratio Combiner (MRC) and proposes a two -antenna CMA/MRC hybrid algorithm for mobile FM reception. Simulation proved that CMA has superior performance in frequency selective multipath (long-delay) with medium and strong signal conditions. On the other hand, the MRC optimizes the Signal-to-Noise Ratio (SNR) output in weak signal conditions. The signal conditions are constantly changing in mobile environment, therefore the appropriate algorithm should be chosen dynamically to optimize signal reception.

Automotive manufacturers are increasingly demanding for better quality reception from radio designers to provide enhanced audio listening experience for their customers. Audio content can be provided from many sources today, including AM/FM signals, CDs, SD cards, USB flash drive, etc. The modern AM/FM receiver incorporates sophisticated DSP algorithms for signal reception and must not sound dramatically inferior to other audio sources. This paper reviews a few key reception environments that the mobile receiver must cope with, in able to provide good quality reception and to meet the required mobile receiver specifications.