Signal waveform processing method for wireless channel parameter measurement

Abstract

The invention belongs to the technical field of wireless channel measurement and discloses a signal waveform processing method for wireless channel parameter measurement signals. A pulse signal and apseudorandom sequence are combined. A pulse random sequence signal is taken as a signal basic waveform. Framing and sending are carried out according to pulse per second timing information. At a receiving end, synchronous sliding correlation reception is carried out through utilization of second timing information. On the premise that delay measurement precision is not reduced, clock synchronization of a transmitter and a receiver is avoided before measurement each time, measurement delay precision and the maximum measurable delay in different scenes can be freely adjusted, the pseudorandom sequence does not need to be reelected, and the method is relatively applicable to online measurement. The method has the advantages that on the premise that the delay measurement precision is not reduced, the clock synchronization of the transmitter and the receiver is avoided before each time measurement, the measurement delay precision and the maximum measurable delay in different scenes can be freely adjusted, the pseudorandom sequence does not need to be reelected, and the method is applicable to the online measurement.

Description

technical field [0001] The invention belongs to the technical field of wireless channel measurement, and relates to a signal waveform processing method for wireless channel parameter measurement. Background technique [0002] Wireless channel parameter measurement is an important basis for wireless communication system design, system simulation, and communication network planning. The parameters to be measured usually include delay power spectrum, main path absolute delay, main path received power, and multipath relative delay. , multipath relative power, etc. [1]. [0003] Wireless channel parameter measurement can be divided into offline channel measurement and real-time channel measurement according to different requirements for instant acquisition of measurement results. According to different measurement bandwidths, it can be divided into wideband channel measurement and narrowband channel measurement. According to different spatial correlation measurement requirements,...

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Problems solved by technology

[0014] This method has three main disadvantages: First, because the alignment of the absolute time of the transceiver depends on a high-precision clock (such as a rubidium clock) or GPS timing, the transceiver needs to perform clock synchronization before each measurement, so that the main path signal can be measured absolute delay

[0017] The limitations of this method are: First, the measurement distance is limited. Since the transmitting and receiving antennas need to be connected to the vector network analyzer, the distance cannot be extended, and it is generally only suitable for indoor environment measurement; but the measurement is not real-time

For a time-varying channel, the frequency response changes very quickly, so fast scanning must be used to make the total scanning frequency response test interval as short as possible. To achieve fast scanning, frequency steps must be reduced, which will sacrifice the time resolution of the time domain and the additional delay. scope

In addition, the system needs high-performance instruments such as vector network analyzers and frequency scanners to build, and the cost is relatively high

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