Use of predistortion in data transmission modems on multipath communication channels

The article describes methods of information transmission on the multipath communication channels, using predistortion of transmitted signal based on channel characteristics at the side of the transmitter. Several new variants of precoding and different optimization methods of its parameters, based on nonlinear signal processing algorithms at the transmitter side, are proposed. Algorithms are proposed for use in HF channels, on this basis optimality criteria of their construction consider necessity of work at low signal/noise ratio and discrepancy of measurement of the channel impulse response at the receiver, and also an additional error, arising on delivery of this information to the transmitter on the feedback channel. Characteristics of the proposed schemes, obtained by simulation, are described.