Channel estimation and equalization of broadband PLC systems - Part 1: Complementary Sequences based channel estimation in OFDM

摘要

In the context of broadband Power Line Communications (PLC), this work proposes an estimation and equalization method for block-pilot OFDM systems. The proposal is based on the correlation properties of Complementary Sequences (CS), performing all the operations in the frequency domain, which allows to reduce communication errors and the overall computational effort. The performance of the method is compared with other approaches, as the Least-Squares (LS) and Linear Minimum Mean-Square Error (LMMSE). Simulations were performed by using two realistic PLC channels, as well as additive white Gaussian noise (AWGN) and diverse configurations of impulse noise (IN) modeled by Middleton Class A distribution (MCA). Results are reported as Bit Error-Rate (BER) graphs, showing that the proposal produces better results than LS, approaching to the good performance of LMMSE but with lower computational requirements.