关键词: xMax, 调制技术, 类正弦波

Abstract:

Through the specification analysis of xMax technique, a realization method of xMax is elaborated. On this basis, a new method to realize the xMax by the way of sine-like wave modulation is proposed. This modulation technique realizes the information carrying through the method of single cyclical modulation to a kind of sine-like wave signal. The technique can achieve the xMax requirements of narrow bandwidth, low sideband power spectral density, extremely low emissive power and high transmission speed. Analysis and simulation show that the bandwidth of peak power spectrum is 300 kHz, the sideband power spectral density is 40 dB lower than peak value of power spectrum density, which enables the sideband to be able to hide well in the background noise; and transmission speed may be achieved to 7.5 Mbit/s.

Key words: xMax, modulation technique, sine-like wave