A new modulation scheme for short range signal transmission is considered. The signal is modulated by sinusoidal waveforms and it is based on the majority of positive or negative waveforms in a symbol interval to determine which symbol, 1 or 0, is transmitted. The system performance implemented with this new modulation scheme is simulated and compares with the traditional BPSK modulation, it has the result that when the system is not synchronized and the transmitted signal suffers a delay greater than a threshold then the new design modulation scheme has a better performance than the traditional BPSK modulation and its allowable delay range is also larger than the BPSK format. With this modulation method we can simplify the receiver terminal hardware structure and to reduce the total system cost.
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