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Bandwidth judgment and symbol synchronization method and device

A symbol synchronization and bandwidth technology, applied in the field of communication, can solve the problems of high complexity, low accuracy, and weak robustness of bandwidth judgment and symbol synchronization methods, so as to improve receiving performance, resist multipath channels and anti-interference , the effect of low computation

Active Publication Date: 2017-11-17
SHENZHEN XINZHILIAN TECH CO LTD
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Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide an 802.11ac-based bandwidth judgment and symbol synchronization method and device for the deficiencies of the prior art, which overcomes the high complexity and low accuracy of the bandwidth judgment and symbol synchronization methods of the prior art. Low, weak robustness flaws

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  • Bandwidth judgment and symbol synchronization method and device
  • Bandwidth judgment and symbol synchronization method and device

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Embodiment Construction

[0031] The present invention is based on the 802.11ac bandwidth judgment and symbol synchronization method, comprising steps:

[0032] A1. Determine the end position of the frame field L-STF in the received signal;

[0033] A2, each sub-channel sampling signal sequence after the end position of the frame field L-STF and the LTF data sequence stored at the receiving end are sequentially subjected to a cross-correlation operation to obtain a cross-correlation operation value sequence;

[0034] A3. Perform smoothed energy estimation on the cross-correlation operation value sequence to obtain a smoothed energy estimated value sequence, and determine a symbol synchronization position and a current bandwidth value according to the smoothed energy estimated value sequence.

[0035] According to a specific embodiment of the present invention, the step A3 includes the step: B1, finding the maximum peak value in the smoothed energy estimation value sequence, and determining the symbol s...

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Abstract

The invention discloses a bandwidth judgment and symbol synchronization method and device. The method comprises the following steps: A1, determining an end position of a frame field L-STF in a received signal; A2, performing cross-correlation operations on sub-channel sampled signal sequences after the end position of the frame field L-STF and LTF data sequences stored at a receiving end in sequence to obtain a cross-correlation operation value sequence; and A3, performing smoothing energy estimation on the cross-correlation operation value sequence to obtain a smoothing energy estimation value sequence, and determining a symbol synchronization position and a current bandwidth value according to the smoothing energy estimation value sequence. Through adoption of the bandwidth judgment and symbol synchronization method and device, the complexity of a digital circuit architecture design is lowered; real-time performance is realized since the calculated amount is relatively small; use of a mode of an absolute threshold decision peak value is avoided; and relatively high multipath channel resistance and interference resistance are achieved.

Description

technical field [0001] The present invention relates to the field of communication technology, in particular to an 802.11ac-based bandwidth judgment and symbol synchronization method and device. Background technique [0002] Compared with the old IEEE 802.11 protocol, IEEE 802.11ac increases the selection of signal transmission bandwidth from 20MHz and 40MHz to 20MHz, 40MHz, 80MHz and 160MHz. The transmission rate has been greatly improved. Faced with various signal transmission bandwidths, whether the receiver can accurately judge the signal bandwidth of the transmitted frame is a crucial link in the demodulation process. At the same time, if the symbol synchronization operation fails, frame demodulation will generally fail, so symbol synchronization is also a very important link. [0003] figure 1 It is the frame structure of all transmissions of 802.11ac and legacy protocols. VHT is the frame structure of the 802.11ac protocol. Generally speaking, L-STF is used for f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26
CPCH04L27/2662H04L27/2691
Inventor 朱嘉俊
Owner SHENZHEN XINZHILIAN TECH CO LTD
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