A simplified coarse synchronization method and system in emergency communication ofdm system

A technology for emergency communication and coarse synchronization, applied in multi-frequency code systems and other directions, can solve problems such as limited resources, multiple multipliers, and consumption, and achieve the effect of reducing occupancy and algorithm difficulty.

Active Publication Date: 2018-08-31
THE THIRD MEDICAL CENT OF THE CHINESE PEOPLES LIBERATION ARMY GENERAL HOSPITAL
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Problems solved by technology

[0002] The coarse synchronization algorithm in the IEEE802.11a protocol uses operations such as division, sliding correlation, and normalization, so it needs to consume more modules such as multipliers when modeling
Due to the limited resources of multiplier modules in current programmable logic devices, large-scale programmable logic devices are required to implement more complex algorithms, which will increase the cost of hardware development

Method used

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  • A simplified coarse synchronization method and system in emergency communication ofdm system
  • A simplified coarse synchronization method and system in emergency communication ofdm system
  • A simplified coarse synchronization method and system in emergency communication ofdm system

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Embodiment Construction

[0021] This embodiment belongs to the coarse synchronization module of the receiver in the system, as attached figure 1 shown. The specific implementation process is as follows:

[0022] 1) Realize autocorrelation, as attached figure 1 The autocorrelation unit shown in the first part adopts two complex multiplier modules to realize the complex autocorrelation of the two received signals, that is, to realize the operation of the formula (1).

[0023] 2) Realize cumulative summation, that is, complete the operation of formula (2), such as figure 1 The shift-sum unit shown in the second part. Because the autocorrelation is a complex signal, it is necessary to perform a modulo calculation, that is, the sum of the square of the real part and the square of the imaginary part. The complex multiplier module complexMult1D3 and two summation modules realize the modulo calculation of the two signals. Then use two shift and sum modules ShiftAdd1D and ShiftAdd1D1 to realize cumulative ...

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Abstract

The invention discloses a method for simplifying coarse synchronization in an emergency communication OFDM system, and directing at the problem of coarse synchronization of the OFDM system, the head of an OFDM data frame is discovered by taking a maximum value in sliding summation and performing differencing on intervals. A simple method is utilized to realize calculation of the slope of a curve, and a calculation method of using multiplication and division methods to obtain the slope in the prior art is avoided, thereby lowering algorithm difficulty, and reducing the occupation quantity of FPGA resources in a system implementation process.

Description

technical field [0001] The present invention relates to the realization of the physical layer of Orthogonal Frequency-Division Multiplexing (OFDM: Orthogonal Frequency-Division Multiplexing), the core technology of the broadband wireless communication system and the mobile communication system, in particular to a simplified rough synchronization method and system in the emergency communication OFDM system . Background technique [0002] The coarse synchronization algorithm in the IEEE802.11a protocol uses operations such as division, sliding correlation, and normalization, so more modules such as multipliers are consumed during modeling. Due to the limited resources of multiplier modules in current programmable logic devices, it is necessary to use large-scale programmable logic devices to realize more complex algorithms, which will increase the cost of hardware development. Contents of the invention [0003] In order to solve the above problems, the purpose of the presen...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/26
Inventor 郑静晨李明李晓雪郝昱文李争平张笛笛
Owner THE THIRD MEDICAL CENT OF THE CHINESE PEOPLES LIBERATION ARMY GENERAL HOSPITAL
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