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Self-adaptive multipath management method of CDMA system

A technology of multipath management and code division multiple access, applied in transmission systems, electrical components, etc., can solve problems such as affecting the demodulation performance of receivers, and achieve the effect of maintaining wireless link synchronization, ensuring accuracy and stability

Active Publication Date: 2015-10-28
SHANGHAI INST OF MICROSYSTEM & INFORMATION TECH CHINESE ACAD OF SCI +2
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, if the strength and jump of the path are not limited, it will affect the demodulation performance of the receiver.

Method used

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  • Self-adaptive multipath management method of CDMA system
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  • Self-adaptive multipath management method of CDMA system

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Embodiment Construction

[0028] Below in conjunction with specific embodiment, further illustrate the present invention. It should be understood that these examples are only used to illustrate the present invention and are not intended to limit the scope of the present invention. In addition, it should be understood that after reading the content taught by the present invention, those skilled in the art may make various changes or modifications to the present invention, and these equivalent forms also fall within the scope defined by the appended claims of the present application.

[0029] Embodiments of the present invention relate to an adaptive multipath management method of a code division multiple access system, such as figure 1 shown, including the following steps:

[0030] (1) Peak search: recursively search for M_peak peaks that meet the threshold from the time-delay expansion data, and record the respective positions and peak sizes of these M_peak peaks, and form a peak table according to th...

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Abstract

The present invention relates to a self-adaptive multipath management method of a CDMA system, comprising the steps of: calculating a delay spread function, recursively searching peak values meeting a certain threshold from the delay spread function, recording positions and sizes of the peak values, and forming a peak value table according to order of energy size; performing path inspection for fingers in the peak value table, and outputting detection marks; refreshing synchronous states of the fingers according to a result of the path inspection; for a candidate finger in the synchronous state, if the peak value of the candidate finger exceeds a value obtained by multiplying the peak value of the finger with the minimum peak value in a finger table by an exchange threshold, exchanging the candidate finger and the finger to achieve refreshing of finger information; replacing the original path which has been distributed to the candidate finger and has a poor signal to noise ratio or has disappeared with a newfound path with a good signal to noise ratio, so as to achieve a refreshing process of the candidate finger; and finally extracting the fingers with big peak values from the finger table to configure a Rake receiver. The self-adaptive multipath management method of the present invention can improve an acquisition probability of actual paths and can reduce a false alarm rate.

Description

technical field [0001] The invention relates to the technical field of wireless mobile communication, in particular to an adaptive multipath management method of a code division multiple access system. Background technique [0002] Due to the radio wave propagation characteristics of the mobile communication system, there are multipath reflection, scattering and various attenuation. Therefore, the information to be transmitted will pass through different transmission paths in the air and reach the receiving end at different times, resulting in multipath signals at the receiving end of the terminal. Multipath signals with different amplitudes and phases are superimposed at the receiving end, which will cause fast fading of the signal and affect the communication quality. Rake receivers commonly used in mobile communications are based on spread spectrum sequences. First, the multipath signals in the air are separated, corrected, and then combined and demodulated, so as to mak...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B1/7115
Inventor 陈新华苏瀚俞凯卜智勇
Owner SHANGHAI INST OF MICROSYSTEM & INFORMATION TECH CHINESE ACAD OF SCI
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