QUADRATURE MULTIPLEXING OF TWO DATA SIGNALS WHICH ARE EXTENDED BY MEANS OF DIFFERENT PN-SEQUENCES Russian patent published in 1998 - IPC

FIELD: method for communication using in-phase channel (I) and quarter-phase shifted channel (Q) in communication system with extended spectrum. SUBSTANCE: method involves transmission of first and second information signals (a_n,b_n) through I and Q information channels using direct serial communication signals with extended spectrum. In-phase pseudorandom noise signals (PN_I) and quarter-phase shifted pseudorandom noise signals (PN_Q) of given PN codes (178, 180) are used for extension of respectively first and second information signals (a_n,b_n). In particular, PN_I and PN_Q signals are joined with first and second information signals (a_n,b_n) and orthogonal functional signal 174 for generation of I- and Q-channel modulation signals (S_I,S_Q). I-channel and Q-channel modulation signals (S_I,S_Q) are used for modulation of in-phase carrier signal I and quarter- phase shifted carrier signal Q for transmission to receiver through I and Q communication channels respectively. Another claim of invention describes best possible design of receiver which is designed as device for evaluation of at least first information signal using I- channel and Q-channel modulated carrier signals (R_I,R_Q) received through I and Q information channels. Received I-channel and Q- channel modulated carrier signals (R_I,R_Q)$ are demodulated and convoluted in order to provide sequences which are correlated with in-phase and quarter-phase shifted projection signals. Phase shifter evaluates at least first information signal using projection signals I and Q and received test signal. EFFECT: possibility to increase transmission rate of communication channel above nominal value. 28 cl, 8 dwg