The Effect of Crosstalk due to Path Non-linearity on the OFDM Signal Reception Noise Immunity

Many modern high-speed wireless data transmission networks, digital television, mobile networks and other often use OFDM multifrequency signals to resist a multipath propagation. However, the use of OFDM, in addition to its advantages, faces a number of problems. Due to the fact that the transmission path, reception path and the physical channel can often have the non-linearity, the OFDM signal at the transmission path output will have crosstalk. This article analyzes the signal reception noise immunity with crosstalk in system with OFDM and non-linear path amplitude characteristic. Crosstalk between OFDM subcarriers can significantly reduce the noise immunity of the transmission system. Dependence of the error probability, taking into account crosstalk noise, on the ratio of the average signal powers to the fluctuation noise is analyzed. It is also shown that limiting the peak values of the OFDM signal in the transmitter allows to obtain an energy gain compared with the linear mode of the transmitter.