Signal channel training method and signal channel training receiver device based on beacon frame

Abstract

The invention discloses a signal channel training method based on a beacon frame, which includes: performing initial synchronous search for the beacon frame and computing initial estimation of frequency offset of a sampling clock after access terminal equipment is powered on; starting tracking estimation and compensation of frequency offset of the sampling clock based on initial estimation of frequency offset of the sampling clock; estimating in-band narrow-band interference and computing the coefficient of a notching filter according to the frequency point position of the in-band narrow-band interference; performing second power control processing for digital baseband signals processed by means of low-pass filtering and notching filtering; starting coarse carrier frequency offset estimation and compensation; starting fine carrier frequency offset estimation and compensation; starting signal channel frequency response estimation; and leading a receiver to enter a signal channel condition tracking state. The invention further discloses a signal channel training receiver device based on the beacon frame. The success probability of synchronous detection for the beacon frame can be increased, and signal channel estimation precision can also be improved.

Description

technical field [0001] The invention relates to the field of digital communication, in particular to a channel training method based on beacon frames in a broadband access communication system based on coaxial cables. The invention also relates to beacon frame based channel training receiver apparatus. Background technique [0002] The coaxial cable-based broadband access technology uses the existing coaxial cable network to achieve high-speed, high-reliability network access and data transmission without any adjustments to the existing network. It is compatible with other access technologies such as xDSL, Compared with technologies such as Ethernet access and even FTTH access, it has obvious comprehensive advantages in terms of access network transformation cost and access bandwidth. Typical broadband access technologies based on coaxial cables include HiNOC, HomePlug AV, MoCA, and HomePNA. [0003] Broadband access technologies based on coaxial cables usually use OFDM (O...

AI Technical Summary

Problems solved by technology

The high error probability of frame synchronization detection of beacon frames and the insufficient accuracy of channel training are the biggest limiting factors for the performance of broadband access communication systems based on coaxial cables

Deviations in the frame synchronization detection results of beacon frames will lead to an increase in the packet loss rate of data transmission in the system

If there is a serious deviation in the frame synchronization detection result, communication cannot be carried out at all. At this time, the system can only reset and perform frame synchronization detection again, which increases the time for the terminal device to access the network, resulting in poor network access experience for users. reduction of

On the other hand, the insufficient accuracy of channel training leads to insufficient compensation for the distortion of the signal spectrum caused by the power deviation, time-frequency deviation and channel response in the communication system. These residual errors will affect the bit error of the communication system. The performance has a serious impact. If the residual error is too large, the packet loss rate will be greatly reduced, thereby reducing the communication efficiency of the system and ultimately reducing the user's network access experience.

Images