Abstract：In order to improve the spectral structure of random-polar modulated Extended Binary Phase Shift Keying with Continuous Phase (CP-EBPSK), a random-polar and Modified CP-EBPSK (MCP-EBPSK) with the adjustment coefficient of spectrum shape is proposed. The principle of random-polar modulated MCP-EBPSK is demonstrated, and the theoretical spectrum expression of MCP-EBPSK is given. Meanwhile, digital impacting filters appropriate for demodulation are designed, the block diagram of random-polar modulated MCP-EBPSK communication system without channel code is given, the power spectrum characteristic and demodulation performance of such modulated signals are analyzed and verified, and the demodulation performance of multipath channel is also simulated. Simulation results show that: by the adjustment of spectrum shape, the new modulation method is promising not only in higher spectrum efficiency, but also better in demodulation performance; At present, this system is not suitable for wireless channel, and is hoped to be applied to cable channel firstly.
2012, Vol. 34 
