New baseband zero-crossing demodulator for wireless communications. I. Performance under static channel

A new, recently developed baseband receiver, called “zero-intermediate frequency zero-crossing demodulator (ZIFZCD),” is presented in this paper. The ZIFZCD is applicable to both π/4-quadrature phase shift keying (π/4-QPSK) and continuous phase frequency shift keying (CPFSK) signals. This ZIFZCD is mostly implemented in digital hardware that offers low power consumption, small size, and ease of manufacturing, compared to conventional analog hardware and digital signal processor implementations. The digital implementation of the ZIFZCD is found to be much simpler than that of the conventional zero-intermediate frequency cross-differentiate-multiply (ZIFCDM) demodulator. Also presented are the performance analysis and simulation results for the proposed ZIFZCD under static environments