High-resolution real-time multi-diameter channel detection method, data processing method and apparatus
A high-resolution, channel testing technology, used in transmission monitoring, electrical components, transmission systems, etc., can solve problems such as unfavorable external field channel testing, direct pulse method influence, unsuitable external field testing, etc., to reduce computational complexity and accuracy. Improve, improve the effect of coverage
Inactive Publication Date: 2007-06-13
SHANGHAI INST OF MICROSYSTEM & INFORMATION TECH CHINESE ACAD OF SCI +1
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Problems solved by technology
[0009] As for the other two traditional methods, there are defects that are more unfavorable to the field channel test: the direct pulse method is seriously affected by interference and noise, the coverage is limited, and it must be accurately triggered by the first arriving pulse; the frequency domain channel method Requires strict synchronization of the transceiver and can only work at close range, so it is not suitable for field testing
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[0042] Below in conjunction with accompanying drawing and embodiment, method and device of the present invention are described in further detail:
[0043] As shown in Figure 1: the high-resolution real-time multipath channel testing device of the present invention comprises:
[0044] The transmitter includes:
[0045] Digitally modulated PN sequence generator, which produces a completely consistent pseudo-random (PN) sequence, and digitally modulates the sequence to generate a digitally modulated pseudo-random signal A; in this specific embodiment, BPSK (binary shift key control) modulation method.
[0046] The D / A conversion carrier modulation device performs digital-to-analog conversion on the pseudo-random signal A and performs direct-sequence spread spectrum modulation on the carrier to generate an analog radio frequency signal B, and transmits the signal B through the antenna of the transmitting end.
[0047] Receiver includes:
[0048] The local reference signal gener...
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The testing device includes following parts: being setup at receiving end, the local reference signal generator generates pseudorandom sequence identical to sequence at transmitting end, and generates direct sequence spread spectrum modulation through digital modulation; generating reference signal, the dual channel treater in high speed carries out under sampling for received RF signal and the reference signal; fast multiple path treater carries out down-conversion for the sampled data digitally so as to obtain baseband signals E and F, and carries out fast correlation for E and F; calculating correlation G repeatedly, and inputting G to data processing system. The method includes steps: generating pseudorandom sequence; receiving RF signal; calculating correlation repeatedly; displaying and data processing. The invention raises resolution precision, obtains information of amplitude and phase of each multiple path component, and carries out real time process at outfield.
Description
field of invention [0001] The present invention relates to a multipath channel test method, data processing method and device, in particular to a method and test for measuring and researching the time delay extension caused by radio waves propagating in multipath channels and separating each multipath component device. Background technique [0002] One of the main characteristics of land mobile communication channels is the fading effect caused by multipath propagation on a small scale. The multipath effect will cause the amplitude of the wireless signal to rapidly fade after a short time or short distance propagation. This fading is caused by the mutual interference of the same transmission signal propagating along two or more paths and arriving at the receiver with a small time difference. It is often called "resolvable multipath", or "multipath" for short. [0003] Traditional multipath channel test methods mainly include: direct pulse measurement method, spread spectru...
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Login to View More IPC IPC(8): H04B17/00H04B17/309
Inventor 王萍陈迅轶陈剑
Owner SHANGHAI INST OF MICROSYSTEM & INFORMATION TECH CHINESE ACAD OF SCI