초록 ▼

A method and system are provided for the transmission and reception of a varying reference signal together with a data-modulated signal in a communication system. The reference signal is modulated by multiplying it by a predetermined reference value sequence and is summed together with the data-modu

A method and system are provided for the transmission and reception of a varying reference signal together with a data-modulated signal in a communication system. The reference signal is modulated by multiplying it by a predetermined reference value sequence and is summed together with the data-modulated signal in the transmitter system. The reference signal and reference value sequence generators are identically embodied in both the transmitter and receiver systems. The receiver system determines an estimate of the transmitted reference signal by canceling the effect of the reference signal modulation. The estimated reference signal may be removed from the received signal prior to demodulation of the data-modulated signal by subtracting the unmodulated reference signal estimate, which is multiplied in the receiver system with the known reference value sequence.

대표청구항 ▼

[ I claim:] [1.] A communications system including a transmitter and a receiver which utilizes a modulated reference signal in order to reduce the effects of non-linearity and stationary interference on the recovery of the reference signal, the communications system comprising:a transmitter includin

[ I claim:] [1.] A communications system including a transmitter and a receiver which utilizes a modulated reference signal in order to reduce the effects of non-linearity and stationary interference on the recovery of the reference signal, the communications system comprising:a transmitter including at least one subcarrier modulator for generating at least one data modulated signal;said transmitter further including means for generating a modulated reference signal which varies from reference signal baud interval to reference signal baud interval in a predetermined manner based upon a sequence of reference values;a summer in said transmitter for summing the modulated reference signal and the at least one data modulated signal to form an overall composite signal;means for transmitting the overall composite signal from the transmitter to a receiver, the receiver including:(i) means for cancelling the effect of the modulation of the reference signal thereby forming a substantially unmodulated reference signal;(ii) a first accumulator for accumulating the unmodulated reference signal in order to determine a reference signal estimate; and(iii) means for using said reference signal estimate for at least one of: facilitating baud clock recovery; facilitating carrier frequency recovery; and equalization.