Blind equalization algorithm-based PCM/FM anti-multipath interference telemetry receiving method

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

Inactive Publication Date: 2016-12-21
HUAIHUA UNIV
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  • Abstract
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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

Method used

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  • Blind equalization algorithm-based PCM/FM anti-multipath interference telemetry receiving method

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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] Telemetry technology has been widely used in important fields such as military technology, scientific research and national economy. Especially in the development of weapon system flight products, unmanned aerial vehicle flight systems, and aerospace systems, it has become indispensable, and sometimes even the only measurement technology. The transmission distance of aircraft telemetry in these systems is generally very long, especially for aerospace telemetry, which usually ranges from hundreds of kilometers to thousands of kilometers, sometimes even hundreds of millions of kilometers. Due to the power supply, it is generally impossible to install high-gain antennas on these aircraft, and the aircraft generally move at high speed, so most telemet...

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Application Information

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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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