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Differential decoding method in short-range wireless network

A short-range wireless, differential decoding technology, applied in the shaping network, multi-frequency code system, sustainable building and other directions in the transmitter/receiver, can solve the problems of receiving signal phase influence, affecting demodulation performance, etc., to improve accuracy degree, improve decoding performance, and avoid estimation error

Inactive Publication Date: 2010-12-01
BEIJING TRANSPACIFIC IP TECH DEV
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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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  • Differential decoding method in short-range wireless network
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  • Differential decoding method in short-range wireless network

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[0022] The differential decoding method in the short-range wireless network proposed by the present invention firstly receives the radio frequency signal sent by the transmitting end in the short-range wireless network, performs down-conversion to obtain a baseband received signal, performs 2 times sampling on the baseband received signal to obtain a sampled received signal, and the sampling interval time denoted as T C ; Then, the receiving end in the short-range wireless network starts from the pilot sequence in the above-mentioned received signal, and continuously reads the received signal sequence L=[l of two symbol period lengths 1 , l 2 ,...,l N , l N+1 ,...,l 2N ], where N represents the number of sampling signals within a symbol period length; the conjugate operation is performed point by point on the received signal of the previous symbol period of the above received signal sequence, and the conjugated sampling signal sequence is obtained Multiply each signal in ...

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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...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26H04L27/38H04L25/03
CPCY02B60/50
Inventor 张良赵振丰
Owner BEIJING TRANSPACIFIC IP TECH DEV
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