Research on the single-carrier adaptive equalization based on TH pre-coding technology

In the digital communication system, the intersymbol interference (ISI) at the receiver is usually produced due to the multiple path interference and noise in the channel. Generally, the equalizer at the receiver is employed to compensate the channel and overcome the ISI. The equalizer increases the complexity of communication system. Furthermore, the performances of the equalizer are not ideal for some bad information channels. The paper proposed a single-carrier adaptive equalization method based on the TH pre-coding technology which is almost simultaneously proposed by the British Tomilinson and Japan Harashima. For the single-carrier QPSK technology, the signals at the sender are ore-equalized firstly. Secondly, the adaptive filter is used to estimate the impulse of the channel and determine the coefficients of TH precoding filter. Finally, the adaptive equalizer is employed at the receiver to eliminate the inter-symbol interference again. The implementation principle of single-carrier adaptive equalization is discussed and the operating performances are simulated numerically. The simulation results demonstrate that the method can more strongly suppress inter-symbol interference than traditional equalization methods, and improve the communication reliability. The research results in this paper have important reference value and guiding meaning for the practical application of the single-carrier equalization.