Method for synchronizing time and carrier frequency in short-range wireless network

A short-range wireless, carrier frequency technology, applied in multi-carrier systems, shaping networks in transmitter/receiver, multi-frequency code systems, etc., can solve problems such as large amount of calculation

Inactive Publication Date: 2010-12-01
BEIJING TRANSPACIFIC IP TECH DEV
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Problems solved by technology

However, because the phase estimation interval is -π~π, this method can only estimate -1/2T s ~1/2T s frequency offset between, here T s is the period of the spreading sequence
For frequency offsets beyond this range, the traditional GPS uses a time-frequency two-dimensional search method to pe...

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  • Method for synchronizing time and carrier frequency in short-range wireless network
  • Method for synchronizing time and carrier frequency in short-range wireless network
  • Method for synchronizing time and carrier frequency in short-range wireless network

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Embodiment Construction

[0031] The method for synchronizing time and carrier frequency in the short-range wireless network proposed by the present invention, its flow chart is as follows figure 1 As shown, first receive the radio frequency signal sent by the transmitter in the short-range wireless network, perform down-conversion to obtain the baseband received signal, and use T for the baseband received signal C Sampling for the time interval to obtain the baseband 2 times the sampling received signal; the receiving end in the short-range wireless network starts from any sampling point in the above received signal, and reads the received signal with the length of two symbol periods, and the received signal sequence is denoted as r = [r 1 , r 2 ,...,r N , r N+1 ,...,r 2N ], where N represents the number of sampled signals within a symbol period length; according to the test, the tolerance range [-P P) of the local spread spectrum modulation complex sequence to the carrier frequency offset is obta...

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Abstract

The invention relates to a method for synchronizing time and carrier frequency in a short-range wireless network, and belongs to the technical field of wireless communication. The method comprises the following steps of: obtaining the range of the tolerance of a receiving system to frequency deviation by tests; according to the maximum tolerance, performing phase deviation compensation of a local frequency-expanded modulation sequence, and obtaining a new local frequency deviation correlation value sequence; correlating the received correlation value sequence with the local correlation value sequences, and obtaining a group of correlation value sequences; and according to the position of the sequence corresponding to the maximum correlation value, realizing the decoding of the data. The time-frequency synchronizing method has the advantages of improving the time synchronization performance under the influence of the frequency deviation, making a receiver have lower energy consumption and higher receiving performance under the condition of bigger frequency deviation, improving an operational precision in the frequency deviation compensation and effectively improving the time synchronization performance of the receiver.

Description

technical field [0001] The invention relates to a method for synchronizing time and carrier frequency in a short-range wireless network, in particular to a method for time synchronization and frequency synchronization in a short-range wireless network, and belongs to the technical field of wireless communication. Background technique [0002] Modern wireless network communication adopts the packet transmission mechanism, and the transceivers communicate by transmitting data packets. Time and frequency synchronization must be performed between transceivers before each data transmission begins to ensure that the receiver can accurately resume sending information. [0003] In a spread spectrum based system, time synchronization should find the boundaries of the spread spectrum sequence and the best sampling moment of the pulse corresponding to each element in the sequence. The frequency synchronization is to keep the carrier frequencies of the receiving end and the transmittin...

Claims

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Application Information

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IPC IPC(8): H04L27/26H04L27/38H04L25/03
Inventor 张良赵振丰
Owner BEIJING TRANSPACIFIC IP TECH DEV
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