Timed synchronization method for OFDM-WLAN (orthogonal frequency division multiplexing-wireless local area network) system

An OFDM-WLAN, timing synchronization technology, applied in the field of timing synchronization, can solve problems such as limitation, and achieve the effects of improving accuracy, reducing implementation complexity and resource consumption

Inactive Publication Date: 2013-09-11
SOUTHEAST UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the synchronization scheme based on STF and LTF needs to spend a lot of logic resources, and FP

Method used

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  • Timed synchronization method for OFDM-WLAN (orthogonal frequency division multiplexing-wireless local area network) system
  • Timed synchronization method for OFDM-WLAN (orthogonal frequency division multiplexing-wireless local area network) system
  • Timed synchronization method for OFDM-WLAN (orthogonal frequency division multiplexing-wireless local area network) system

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Embodiment approach

[0065] 1) The burst data signal received by the antenna is roughly synchronized through the delayed autocorrelation algorithm. The specific steps are as follows:

[0066] (1) Pass the received signal through 16 delayers, and correlate and accumulate the signal passing through the 16 delayers with the received signal to obtain C(n)

[0067] C ( n ) = Σ k = 0 15 r ( n + k ) · r * ( n + k + 16 )

[0068] (2) Calculate and accumulate the energy of the output signal of the delayer to obtain P(n)

[0069] P ( n ) = ...

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Abstract

The invention provides a timed synchronization method for an OFDM-WLAN system. The method comprises the following steps: 1) utilizing a delayed autocorrelation and length maintaining algorithm to achieve coarse synchronization and obtain the energy of an STF (short training field); 2) utilizing the energy to perform automatic gain control (AGC); 3) utilizing the weak correlation of noise and the strong correlation of the STF to achieve fine synchronization; and 4) combining the coarse synchronization with the fine synchronization to obtain the initial position of a data symbol. The timed synchronization method for the OFDM-WLAN system utilizes the STF and meanwhile skillfully utilizes the randomness of the noise to achieve timed synchronization, thereby greatly reducing the calculation and the hardware implementation complexity of a synchronization algorithm and meanwhile being capable of locating the position of the symbol rapidly and accurately.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, and in particular relates to a timing synchronization method used in an OFDM-WLAN system. Background technique [0002] Orthogonal Frequency Division Multiplexing (OFDM) is a multi-carrier modulation technique widely used in high-speed wireless local area network (WLAN) transmission, such as IEEE802.11a protocol. However, the OFDM system has very high requirements on the synchronization of the receiver, especially the timing synchronization, which is the first and most critical step of the receiver, and inaccurate timing will cause a significant decline in system performance. For the bursty data transmission mode of the OFDM-WLAN system, a preamble sequence is generally used to achieve synchronization. For example, in IEEE802.11a, a short training sequence (STF) is used to realize coarse synchronization and a long training sequence (LTF) to realize fine synchronization. Many lite...

Claims

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Application Information

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IPC IPC(8): H04W56/00H04W84/12
Inventor 俞菲缪小龙林翰杨绿溪
Owner SOUTHEAST UNIV
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