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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.

This paper presents a low-cost switched diversity receiver system utilizing a single tuner, simple remote antenna unit and one RF cable. The switched diversity algorithm is implemented in the receiver using digital signal processing. The remote unit contains RF switches that select from multiple antenna elements in response to a control signal from the receiver. The control signal is sent from the receiver to the remote unit via the RF cable. Simple logic in the remote unit provides decoding for switch control.

This paper presents a cost-effective receiver system utilizing dual tuner antenna diversity. There are two modes of operation. In mode 1, the system is in phase diversity where two tuners operate harmoniously to minimize severe multipath distortion using beam pointing. In mode 2, the two tuners operate independently while still achieving reception improvement through intelligent antenna switching. This mode uses one tuner with two antenna switched diversity while the second tuner performs background processing. An advantage of this dual tuner architecture is the ability to provide concurrent multipath distortion reduction and background processing. An example of a digital FM receiver which embodies these functions is described.