METHOD AND DEVICE FOR INFORMATION TRANSMISSION IN MULTIPLE BEAM CHANNEL Russian patent published in 1998 - IPC

FIELD: communication, in particular, for multiple-beam channels with fast phase fluctuations and heavy alternating Doppler frequency shifts. SUBSTANCE: method involves use of complex wideband signals by means of carrier phase-shift keying using pseudorandom code and using principle of optimal frequency addition for waves arriving at different routes with different delays detected in course of their matched filtration. Such matching is hard to achieve for fast alternations in signal characteristics. If phase of signal of waves which arrive at different routes with different delays has several non- correlated sign alternations, correlation characteristics of signal are decreased drastically and connection reliability suffers. Method of invention involves additional encoding of code sequence for transmission conforming to condition of relative phase-shift keying, and filling each elementary signal with phase which is increased from signal to signal as quadratic function. When signal is received, it is delayed by duration of single element of complex signal to be transmitted, its frequency is shifted by total value of intermediate frequency and value which is equal to average increment of instantaneous frequency of carrier wave for delay time. This value is multiplied by source wave which has been received and wave at additional frequency is detected. Signal at intermediate frequency is processed as in channel without Doppler shift with known constant phase shifts for waves which arrive with different delays. EFFECT: increased reliability and validity of signal reception. 3 cl, 3 dwg