An alternative coherent demodulation scheme for BPSK signals-signal transform method

The author proposes an alternative coherent demodulation scheme for BPSK signals which is called the `signal transform method´. The method is proceeded on the principle that before the demodulation the BPSK signals are translated into other signal waveforms which can be simply demodulated. In the scheme, the author suggests two new coherent demodulation techniques for BPSK signals which get round the phase ambiguity of recovered carriers as exist in conventional coherent demodulation techniques and simultaneously give the timing clock signals for symbol decisions. The circuitry configurations suggested here are relatively simple. The transformed signals can also be differentially detected with nonredundant error correction, and thus improving the system performance