Differential decoding method in short-range wireless network

Abstract

The invention relates to a differential decoding method in a short-range wireless network, belonging to the technical field of wireless communication. Firstly, the characteristic of cycle repetition of a transmission pilot frequency sequence is utilized to carry out front and back conjugation correlation and accumulation on a received pilot frequency digital signal, thus a reference differential correlation value is obtained; the local spread spectrum modulation sequence is subject to the same operation of front and back conjugation and accumulation so as to obtain a conjugation correlation value; the conjugation correlation value and the reference differential correlation value are related to obtain a complex number correlation value; and according to the characteristics of positive number and negative number of the real part of the complex number correlation value, data decoding is realized. The differential decoding method of the invention lowers decoding calculated amount and improves data decoding performance under the influence of frequency shift, so that a receiver has lower power dissipation and the receiving performance under bigger frequency shift, thus avoiding the error code transmission problem of the traditional differential decoding.

Description

technical field [0001] The invention relates to a differential decoding method in a short-range wireless network, in particular to a data receiving and demodulation method in the 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. After the receiver detects the signal sent to itself, it receives the wireless signal through radio frequency, and then obtains the baseband received signal after sampling. For the baseband receiving signal, first use the packet header data to complete the time, carrier synchronization and frame demarcation operations, and find the position of the effective transmission information in the packet structure data information. [0003] The recovery of transmitted information by using the baseband received signal is data demodulation, which directly determines the consistency between the received signal an...

AI Technical Summary

Problems solved by technology

In addition, for the system of phase shift keying modulation, it is necessary to restore the phase information of the received signal to perform effective decoding, but the propagation of wireless data in the air is often affected by wireless multipath channels, fading and obstacles. As well as the phase change produced by the radio frequency device during up-down conversion, both affect the phase of the received signal, which leads to the need to estimate and compensate the phase change caused by the channel and radio frequency when the decoding process restores the phase information of the received signal

However, the estimation errors and errors introduced by the phase compensation operation further affect the demodulation performance

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