| 摘要 |
FIELD: radio and wire communication lines. SUBSTANCE: method involves binary {0,1} sampling of low-frequency signals in both quadrature orthogonal (cosine, sine) channels by non-coherent receiver, using values of binary signal samples { 00, 01, 10, 11} in both channels in current and previous bits for judging keeping same phase or its reversal. Since central frequency of local oscillator in receiver differs from frequency of local oscillator in transmitter, vector of received signal in X-Y coordinate plane slowly shifts with respect to vector of receiver's local oscillator. In time moments, when projection of vector of received signal is equal to zero with respect to orthogonal coordinate axes, false triggering of comparator (caused by noise) is prevented by means of comparison of absolute value of filtered low-frequency signal to given threshold value Uthr. If absolute values of low-frequency filtered signals in both channels are greater than Uthr, then results of analysis of current and one-bit delayed binary-sampled signals in both channels are added and are sent to output of receiver. If absolute value of low-frequency filtered signal in either channel is less than Uthr, then only results of analysis of current and one-bit delayed binary-sampled signals in another channel are sent to output of receiver. In addition, absolute value of filtered low-frequency signal in the latter channel is close its maximal value due to orthogonal properties. Corresponding device is designed as optimal non-coherent receiver of phase-reversal signals. In addition device has two comparators, two gates, two comparison circuits, which provide implementation of said algorithm. EFFECT: increased stability to noise, simplified design of receiver. 4 dwg |
