Detection device for power and standing wave ratio

Abstract

The invention discloses a detection device for power and standing wave ratio and a method thereof. The device comprises a detection switch unit, a triggering and counting unit, a signal conversion unit, a power and standing wave ratio detecting unit; wherein, the detection switch unit is used for respectively detecting two paths of radio-frequency signals, switching over detection pathways by controlling a single-pole double-throw switch when receiving trigger signals, converting the trigger signals into output voltage signals after detection; the triggering and counting unit is used for periodically sending and counting the trigger signals till a preset threshold value is reached; the signal conversion unit is used for converting the output voltage signals of a detector into direct current voltage signals and converting the direct current voltage signals into digital signals by the timing sampling of an AD convertor; the power and standing wave ratio detecting unit is used for calling a power detection subprogram to detect every path of digital signals to obtain corresponding power values; the obtained power values are averaged, from which the standing wave specific valve is obtained and used as the valve reported to the leadership. The invention can be applied to the detection of the power and the standing wave ratio in a wireless communication system in any signal modulation module, has low cost and high accuracy.

Description

technical field [0001] The invention relates to the technical field of wireless communication, in particular to a detection device and method for power and standing wave ratio. Background technique [0002] In the field of wireless communication, the matching between the antenna feeder system and the power transmission system of the base station directly affects the quality of signal transmission and reception and the safety of equipment. Key indicators. [0003] In practical applications, the standing wave ratio is detected by detecting the coupled forward and reverse power signals to obtain the power value or power ratio in the two directions, thereby obtaining the standing wave ratio. There are generally two implementation schemes for detecting standing wave ratio: one is a pure analog circuit scheme, the implementation circuit of this scheme is relatively complicated, and there are common problems of low detection accuracy and poor anti-interference performance; the oth...

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Problems solved by technology

[0005] For the logarithmic envelope detector, the linearity (log linearity) of this device in the case of unmodulated continuous wave is often very good, so the detection of standing wave ratio can have high accuracy (especially in single frequency continuous wave wave), but the detection result of the power in the modulation mode is only a relative value, which varies greatly in different modulation modes, and is not an absolute real power value, especially in the case of multi-carrier modulation; for the logarithmic mean square Root detectors, such as AD8362 or HMC610, etc., can basically reflect the real power in multi-carrier modulation mode, see figure 1 and figure 2 As shown, but its logarithmic linearity in the entire dynamic range is often not as good as logarithmic envelope detectors such as AD8313 or HMC601, because their errors show a different degree of fluctuation with the input power, so at point The accuracy of VSWR detection at high frequencies is often not as good as that of logarithmic envelope detectors, and although the errors in different modulation modes are much smaller, it is still difficult to basically eliminate them. The detection results in the temperature range of -30°C to +75°C The drift of

[0006] The above scheme (logarithmic envelope or logarithmic root-mean-square detection) still has a problem of hardware filtering and software filtering. In the case of modulated waves, if the detection output is not added with hardware low-pass filtering, then with the peak-average As the PAR increases, the fluctuation will become larger, resulting in unstable sampling data, and the overhead of software processing will increase; but if a commonly used RC filter circuit is added, since the RC filter circuit has an integral characteristic, the integral of the logarithmic output is equivalent to a A kind of distortion and error, so it needs comprehensive software and hardware processing

[0007] For applications where it is necessary to accurately detect the VSWR and the real power under different modulation modes, for example: some products require reporting the real average power in watts, at -30℃~+ The error of the power in the temperature range of 75°C is less than ±10%, and the existing above-mentioned scheme is difficult to realize simply

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