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

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...

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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 perform sliding correlation in the time domain and frequency domain, and estimate the synchronization point of time and frequency according to the peak value of all correlation values. This method is relatively accurate to achieve time-frequency synchronization, but the amount of calculation is too large

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