Method for integrating signal detection and frequency estimation in wireless network

A technology for signal detection and frequency estimation, which is applied to the shaping network, digital transmission system, electrical components, etc. in the transmitter/receiver to achieve the effect of improving performance, reducing complexity, and improving accuracy

Inactive Publication Date: 2009-12-02
BEIJING TRANSPACIFIC IP TECH DEV
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Problems solved by technology

[0006] The purpose of the present invention is to propose a method for signal detection in a short-range wireless network, to solve the co...

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  • Method for integrating signal detection and frequency estimation in wireless network
  • Method for integrating signal detection and frequency estimation in wireless network
  • Method for integrating signal detection and frequency estimation in wireless network

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Embodiment Construction

[0035] The method for signal detection in the short-range wireless network that the present invention proposes comprises the following steps:

[0036] (1) Receive the radio frequency signal sent by the transmitter in the short-range wireless network, and perform down-conversion to obtain the baseband 2 times sampling received signal, and the sampling interval is recorded as T C ;

[0037] (2) From any sampling point in the above-mentioned received signal, read the received signal of one chip period length, and the received signal sequence is denoted as r=[r 1 , r 2 ,...,r N ], where N represents the number of sampled signals in one symbol period;

[0038] (3) Carry out conjugate operation to each sampling point in the above-mentioned received signal and multiply it with its adjacent sampling points to obtain a set of correlation value sequences, denoted as C=[c 1 , c 2 ,...,c N-1 ],in c i = r i ...

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Abstract

The invention relates to a method for signal detection in a short-range wireless network. The method comprises the following steps: firstly, receiving a radio-frequency signal transmitted by a transmitting terminal in the short-range wireless network, and carrying out down-conversion to obtain a baseband sample receiving signal; beginning to read a receiving signal of one code element cycle length from a random sampling point; multiplying every sampling point in the receiving signal by the adjacent sampling point of the last moment after conjugating operation is carried out on every sampling point in the receiving signal to obtain a group of correlation value sequences; summing up all the correlation values in the correlation value sequences to obtain a decision value; calculating an energy statistic value in the receiving signal; calculating the ratio of the decision value to the total energy statistic value and comparing a proportional value with a threshold so as to judge whether the signal is detected or not; and calculating the phase of the decision value after the signal is detected, and utilizing the phase to obtain a frequency estimation value. The method has the advantages of only needing the receiving signal of one code element cycle, reducing the requirement on the data amount of the receiving signal, reducing the calculation amount and the calculation complexity, increasing the real-time property of the realization of the system and enhancing the range of frequency estimation.

Description

technical field [0001] The invention relates to a method for joint signal detection and frequency estimation in a wireless network, belonging to the technical field of wireless communication. Background technique [0002] A communication system using a packet-based burst transmission mode needs to continuously detect the received signal to determine when a data packet is received, and then perform frequency estimation on the training sequence in the prefix signal to ensure that the received signal can be correctly demodulated . In communication systems based on packet-based burst transmission mode, signal detection and frequency estimation play a very important role in the normal operation of the receiver. [0003] Detecting a signal can be done using the modulation properties of the signal. The traditional signal detection method is to use the characteristics of the periodic repeated transmission of the prefix signal of the data packet, and perform front and rear correlat...

Claims

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Application Information

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IPC IPC(8): H04B1/707H04L25/03H04L1/00
Inventor 张良赵振丰朱金兵
Owner BEIJING TRANSPACIFIC IP TECH DEV
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