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Abstract
Bit error rate (BER) performance of a GMSK frequency detection system with soft decision decoding of block codes using Chase's second algorithm is investigated in mobile radio channels. The channel measurement information (CMI) for a bit in the received block is calculated from samples of the received signal envelope (Rs) and the demodulator output (eye level). The CMIs of eye level × Rs and of Rs2 are investigated, and the decoding performances for the CMIs are compared using the Hamming (7,4) code in nonfading (static) and fading channels in laboratory experiments.
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