Signal channel training method and signal channel training receiver device based on beacon frame
A channel training and beacon frame technology, which is applied in the field of channel training based on beacon frames, can solve the problems of increasing the time for accessing terminal devices to access the network, reducing user network access experience, and reducing packet loss rate, etc., to achieve Avoid the decline of channel estimation accuracy, improve system access time performance, and avoid the effect of system performance degradation
Active Publication Date: 2012-07-04
上海明波通信技术股份有限公司
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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 de
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[0048] A typical beacon frame frame format is as follows figure 1 As shown, the beacon frame consists of two parts: a frame header and a frame body. The frame header is mainly used for frame synchronization capture, so it usually contains one or more pseudo-random sequences with good correlation characteristics, such as M sequences. The frame body part of the beacon frame is mainly used for the interaction of some network control information-for example, the interaction of control information required when accessing terminal devices to access the network-or the broadcast of some public information. Considering the improvement of bandwidth utilization efficiency, It usually consists of a few OFDM symbols. Considering that the beacon frame needs to be received and demodulated under harsh conditions before channel training and compensation, a low-order differential modulation method that is not sensitive to carrier frequency offset is usually used, commonly used is DBPSK (differe...
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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...
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Inventor 陈小元刘铁焦金良
Owner 上海明波通信技术股份有限公司
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