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Method for multipath measurement of wireless channel

A wireless channel and intermediate frequency technology, applied in wireless communication, transmission monitoring, electrical components, etc., can solve problems such as difficult to achieve data storage, difficult to achieve multipath resolution, and large data volume

Inactive Publication Date: 2009-09-09
王朕
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Problems solved by technology

However, because the hardware correlator operates at an intermediate frequency, it is difficult to achieve higher multipath resolution, and the amount of data generated is huge, and it is difficult to achieve long-term data storage.

Method used

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  • Method for multipath measurement of wireless channel

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Embodiment Construction

[0010] The transmitter adopts Agilent E4438C vector signal generator to transmit the pseudo-random code spread spectrum signal of the frequency band to be tested. E4438C has a built-in power amplifier with a maximum output power of 15dBm. In addition, it is equipped with an external power amplifier with a maximum output power of 26dBm, a working frequency band of 3.5GHz, and a bandwidth of 20M. All transmitting instruments and equipment use the built-in 10MH reference clock signal of the signal source Agilent E4438C.

[0011] The transmitted data chip data rate (chiprate) is a pseudo-random binary sequence (PRBS) of 13.75Mbps, and the chip clock cycle is 100ns; the clock sequence repetition period is 511 clock cycles; after the PRBS sequence is modulated by BPSK, +1 and - are generated The modulated signal of 1 is filtered by the root mean square raised cosine filter of α=0.35, and the signal is modulated to 3.5GHz, and finally a 15dBm radio frequency signal is output through ...

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Abstract

The invention belongs to the field of wireless communication channel measurement. The method changes a conventional method of carrying out first related calculations and then analog-to-digital conversion and solves a problem of low distinguishability of multipath measurement by using a high-speed data acquisition card and a high-speed disk array, and facilitates the data processing by adopting a digital down conversion at the same time. The invention provides a high-distinguishability method for the measurement of an outdoor high-speed mobile multipath channel, which comprises the following steps that: a signal transmitting terminal adopts a direct sequence spread spectrum for a carrier signal; the signal is received and filtered at a receiving terminal and subjected to down conversion to a processible frequency dot of a medium frequency; the receiving terminal generates a local direct sequence spread spectrum signal of the identical frequency dot of the medium frequency; the two paths of medium frequency signals are acquired at high speed respectively, subjected to digital down conversion and output to a baseband; and finally, test data are stored in the high-speed disk array for data processing. The invention can be used in wireless communication channel measurement, outfield tests and network plan.

Description

Technical field: [0001] The invention relates to a wireless communication channel multipath measurement system. Background technique: [0002] Channel multipath measurement methods mainly include direct pulse measurement, frequency domain channel measurement and spread spectrum sliding correlator measurement. The main problem of direct pulse measurement is that it is seriously affected by interference and noise. Frequency domain channel measurement is not suitable for outdoor long-distance measurement because it requires strict synchronization of the transceiver. The most commonly used multipath measurement is the spread spectrum sliding correlator measurement method. In this method, the pseudo-noise sequence is mixed with the carrier frequency signal at the transmitting end; after the receiver receives the signal at the receiving end, the frequency is down-converted to an intermediate frequency, and then the correlation operation is performed with the reference pseudo-nois...

Claims

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Application Information

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IPC IPC(8): H04B17/00H04W24/00H04W24/08
Inventor 王朕范冰䶮姚梁张健
Owner 王朕
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