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Frame detection and synchronous device for radio communication network

A technology for synchronizing position and frame header, applied in the direction of baseband system components, etc., can solve problems such as inability to detect synchronization point and correlation value exceeding the threshold

Inactive Publication Date: 2006-04-12
BEIJING CEC HUADA ELECTRONIC DESIGN CO LTD
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Problems solved by technology

However, the disadvantage of this method is that the correlation value may exceed the threshold due to the influence of noise, rather than the real correlation peak, making it impossible to detect the synchronization point

Method used

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  • Frame detection and synchronous device for radio communication network
  • Frame detection and synchronous device for radio communication network
  • Frame detection and synchronous device for radio communication network

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Embodiment Construction

[0027] Based on the implementation example of the present invention, it is applied to the detection and synchronization of the IEEE 802.11a frame header, and the circuit block diagram is as follows Figure 5 As shown, the specific implementation steps are given below.

[0028] 1. The A / D sampling rate is 20MHz, and the conjugate value of one of the 10 symbols in the short preamble and the sequence consisting of 16 points is used as the matched filter (11).

[0029] 2. The received signal is sent into a shift register (15) with a length of 16, and the shift register moves forward by one bit at every moment, and receives a new signal.

[0030] 3. At each moment, the data on the registers (15) and (11) are subjected to a correlation operation, that is, the data at the corresponding positions are multiplied, and the multiplied results are accumulated to 16 points, and the real part of the accumulated result Square and add the imaginary part respectively, or take the absolute valu...

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Abstract

A detection and synchronization device of IEEE 802.11a or HiperLan2 frame head is featured as utilizing match filter to carry out inter-correlation operation on short Preamble series for obtaining a correlation series, determining that standard signal consistent to IEEE 802.11a or HiperLan2 is detected out and seeing that synchronous position can be confirmed preliminarily according to it if specific correlation peak value situation is obtained i.e. wave peak appeared in equal distance continuously and then no wave peak exceeding threshold in the same distance.

Description

technical field [0001] Generally speaking, the present invention relates to a baseband signal receiver device used in a wireless communication device, specifically, the baseband signal receiver involved in the present invention includes a device for frame header detection and synchronization determination based on IEEE 802.11a or HiperLan2 protocol circuit. Background technique [0002] Wireless LANs are flexible data communication systems that can supplement or replace wired LANs within buildings or campuses. WLAN can use radio waves to transmit data, which reduces the need for wired connections, combines data connectivity with user mobility, and is applied to some portable terminals such as notebooks. Such a wireless data communication system can be used in many occasions, such as hotels, airport terminal buildings, hospitals, campuses, and the like. [0003] WLAN can have a variety of technologies to choose from, such as multi-carrier system, spread spectrum system, nar...

Claims

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Application Information

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IPC IPC(8): H04L25/02
Inventor 刘立国滕炜亮
Owner BEIJING CEC HUADA ELECTRONIC DESIGN CO LTD
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