Method for judging radio testing environment under the condition of external field

Abstract

The invention relates to a method for judging the radio testing environment under the condition of an external field, which comprises the following steps of: dividing a certain area to be tested and determining at least three points to be tested; observing that shelters are not present by using a sight line; for each point to be tested, subsequently measuring a noise signal of a target communication frequency, calculating the average received power and the variance received power of the noise signal, and determining that the area belongs to the NLOS environment when the average received power is more than -90dBm or the variance of the received power value is more than 9dBm<2>; measuring receipt signal power, and determining that the area belongs to the NLOS environment when the receipt path number is more than 1 and the power of a path 1 is too small; and calculating an actual attenuation value and a theoretical attenuation value of a transmission signal, determining the area belongs to the NLOS environment if a result of subtracting the theoretical attenuation value from the actual attenuation value is more than 5dBm, and determining that the area belongs to the LOS environment if the result is not more than 5dBm. The invention provides a method for quantitatively and accurately judging the wireless signal propagation environment under the condition of the external field, overcomes the defect of inaccuracy of the conventional visual inspection experience judgment, and is worthy of popularization.

Description

technical field [0001] The invention relates to the field of wireless communication, in particular to a method for judging that the wireless signal propagation environment is a line-of-sight under external field conditions. Background technique [0002] Under field test conditions, wireless electromagnetic waves are interfered by factors such as climate, terrain, buildings, and vegetation coverage during propagation, and will arrive at the receiver along multiple paths, that is, multipath effects will occur. The channel characteristics of each path change with time, and the relationship between the component fields participating in the interference will also change. Since the signal components of each path arrive at the receiver at different times, the phase of the received signal is also different. When the multipath of different phases When the signal phases are the same, the effective signal superimposed at the receiving end is strengthened; when the phases of the signals...

AI Technical Summary

Problems solved by technology

Among them, the LOS environment means that there is a direct path among the several arrival paths between the transmitter and the receiver, the power component of the direct path accounts for the main part of the received signal power, and its propagation direction and attenuation loss can be predicted; while NLOS The arrival of signals on various paths in the environment is affected by factors such as complex terrain, weather, and human factors, and the propagation process and channel characteristics are difficult to predict

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