Patent ID: 6920115

Claim:
A time-division multiplex radio communication method, wherein a transmitter transmits radio signal bursts destined for at least one receiver in time slots allocated to a channel on a carrier frequency, wherein the radio signal of each burst is formed from a block of digital symbols including training symbols provided for an estimation of demodulation parameters by the receiver and information symbols to be estimated by the receiver by a demodulation using the estimated parameters, wherein the training symbols comprise a first sequence of symbols placed at the start of the block from which each radio signal burst is formed and a second sequence of symbols placed at the end of said block, wherein each radio signal burst comprises an initial portion in which the radio signal rises in power up to a range of transmission power, a central portion in which the radio signal is transmitted within said power range and a final portion in which the radio signal decreases in power from said power range, wherein at least one of the first and second sequences of training symbols gives rise to a modulation of the radio signal of the burst outside the central portion, and wherein the receiver receiving a signal segment corresponding to a burst formed from a symbol block executes the steps of: estimating first demodulation parameters on the basis of the first sequence of training symbols and the start of the signal segment; calculating first estimations of the information symbols of said block on the basis of the first demodulation parameters and the signal segment scanned from start to end; estimation of second demodulation parameters on the basis of the second sequence of training symbols and the end of the signal segment; and calculation of second estimations of the information symbols of said block on the basis of the second demodulation parameters and the signal segment scanned from end to start.