An improved low-voltage power line communication system channel estimation algorithm

Abstract

The invention discloses an improved low-voltage power line communication system channel estimation algorithm. The algorithm follows the following steps: Initial value of channel estimation is obtainedthrough an LS algorithm, IDFT is used to convert (shown in the description) to the time domain to obtain (shown in the description); Impulse noise filtering is performed on the sample points outsidethe cyclic prefix to obtaing (shown in the description); The sample points outside the cyclic prefix are all noise sample points, all the sample points are set to zero. After the impulse noise is removed, the noise sample points outside the cyclic prefix and the sample points in the cyclic prefix are smoothed to obtain a noise threshold T; the T is used to perform noise filtering on the sample points in the cyclic prefix to obtain a time domain expression hDFT of the final channel estimation (n); DFT is performed on hDFT(n) to obtain a frequency domain representation of channel estimation. Thealgorithm filters out the impulse noise outside the cyclic prefix, solves the problem that the threshold threshold is set too large and the useful sample points in the cyclic prefix are filtered outdue to the interference of the power line impulse noise, and improves the performance of the channel estimation.

Description

technical field [0001] The invention relates to the technical field of communication, in particular to an improved channel estimation algorithm of a low-voltage power line communication system. Background technique [0002] Power Line Communication (PLC) refers to the communication technology that transmits signals through power lines. Because the original power line system is used for communication, there is no need to rearrange communication lines, which can greatly reduce communication costs. And the arrangement of the power line to communicate needs to face the harsh communication environment. Orthogonal Frequency Division Multiplexing (OFDM) is a key technology to realize broadband power line communication. This technology uses multiple mutually orthogonal subcarriers to transmit information, which not only greatly improves the transmission rate, but also effectively counters the power line channel. The frequency selective fading and multipath delay improve the transmi...

AI Technical Summary

Problems solved by technology

However, the threshold threshold does not take into account the energy distribution of useful sample points in the cyclic prefix, and it is prone to the situation that the threshold threshold is too large, so that some useful sample points in the cyclic prefix will be erroneously filtered out

Images