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Design and realization of wireless transmitter and receiver based on π/4D-QPSK

WANG Yong-gang, ZHANG Wan-sheng, SHI Jiang-tao, DAI Xue-long ( Department of Modern Physics, University of Science and Technology of China, Hefei 230026, China )  
A general, flexible and program reconfigurable wireless transmitter and receiver is needed to build up the specific wireless data communication system for achieving some specific application demands. The structural design, simulation test and engineering implementation of such a kind of transceiver are described in the paper. In the structural design, the major design steps in π/4D-QPSK modem, such as differential encoding and decoding, SRRC filter, symbol clock synchronizing techniques are described in detail. In simulation test, the bit-error performance of the transceiver, which was obtained with Simulink simulation test, shows that the correctness of the design. Finally, the transceiver connecting with PC by USB interface is built up with a transmitting signal processor (TSP) AD6623, a receiving signal processor (RSP) AD6652, and a general-purpose digital signal processor (DSP) TS101S. All of these components make the system a great flexibility to satisfy the demands of many applications.
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