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A pcm/fm anti-multipath interference telemetry receiving method based on blind equalization algorithm

A technology of blind equalization algorithm and receiving method, applied in the field of telemetry, to achieve the effect of compensating for frequency selective fading

Inactive Publication Date: 2018-08-10
HUAIHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The environment of mobile communication channels is constantly changing, especially in today's increasingly widespread mobile communication applications, requiring the update rate of adaptive nonlinear equalizer parameters to be at least an order of magnitude faster than the change of channel parameters, which is generally difficult to meet such conditions

Method used

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  • A pcm/fm anti-multipath interference telemetry receiving method based on blind equalization algorithm

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Embodiment Construction

[0028] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments. However, it should not be understood that the scope of the above subject matter of the present invention is limited to the following embodiments, and all technologies realized based on the content of the present invention belong to the scope of the present invention.

[0029] like figure 1 It shows the position of the CMA blind equalizer disclosed in the present invention in the whole FM / PCM receiving chain.

[0030] combine figure 1 , detailing the specific implementation process of the signal reception processing of the blind equalization device:

[0031] Step 1: The 30MHz-150MHz intermediate frequency signal is mixed to a complex baseband signal.

[0032] Step 2: The complex baseband signal is sent to a low-pass filter to reduce out-of-band sidelobes and prepare for extraction.

[0033] Step 3: The filtered signal is extracted, the sampl...

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Abstract

The present invention relates to an adaptive blind equalization method for PCM / FM telemetry links. According to the method, frequency selective fading caused by multipath channels is compensated, so that ISI (inter-symbol interference) will not be generated on the time domain of PCM (pulse-code modulation) / FM (frequency modulation) signals; analog modulation signals are sampled, so that digital signals can be obtained; and the digital signals are sent to a tap coefficient-adjustable digital filter, so that the frequency selective fading of the channel can be compensated, and influence on PCM / FM constant-mode signals caused by the frequency selective fading of the channel can be eliminated; and the digital FIR filter operates a simple adaptive algorithm through using the gradient search of a performance function.

Description

technical field [0001] The invention relates to the field of telemetry, in particular to a telemetry receiving method for realizing anti-multipath interference by using a blind equalization algorithm. Background technique [0002] In a digital communication system, due to the mixed effect of various factors such as band-limited transmitter, receiving filter, relative motion between transmitter and receiver, amplifier, time delay and multipath effect, coupling effect and multiple access interference, etc. During the transmission of the signal sequence, strong intersymbol interference (Intersymbol Interference, ISI) and interchannel interference (Interchannel Interference, ICI) are generated. The continuous accumulation of inter-symbol interference and inter-channel interference will lead to the generation of bit errors, thereby degrading the communication quality, and in severe cases, it may even be impossible to communicate at all. With the development of communication towa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B1/10H04B1/12H04B1/711H04L25/03
CPCH04B1/1081H04B1/123H04B1/711H04L25/03006H04L25/03885
Inventor 杨玉军杨夷梅
Owner HUAIHUA UNIV
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