A new demodulation scheme suitable for digital cellular communication systems is proposed. This scheme once converts IF signal to a logic level, after that, phase detection is performed all by digital operations. Since analog components such as I/Q detector and AID converters are eliminated with this scheme, low power consuming and adjustment free receiver can be realized. In this paper, an application for ~/4-shifted QPSK demodulation is considered, which is now becoming popular in cellular communications field. An experimental receiver for ~/4-shifted QPSK has been built to evaluate its performance. The experimental results show bit error rate of 1 x lo-' at 12dB Eb/No with post detection diversity under fast fading environments. The results are quite satisfactory, giving prospects for future digital cellular communication applications.
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