Low complexity precoder and equalizer for DMT systems with insufficient cyclic prefix

The cyclic prefix adopted by discrete multitone (DMT) systems may impose a data rate reduction or be insufficient to prevent inter-symbol and inter-carrier interference from distorting the received symbols and degrading the system performance. Thus, techniques that are able to prevent this distortion while maintaining low power consumption and reasonable complexity are attractive. This works develops a structure to mitigate insufficient cyclic prefix distortion by combining a transmitter-based precoder and a receiver equalizer operating in the time domain DMT symbols. The proposal explores complexity reduction strategies to improve the trade off between the data rate loss imposed by cyclic prefixes and the additional computational cost for accomplishing precoding and equalization. Simulation results show that the proposed method has a computational cost significantly below the cost presented by previous methods.