RSSI circuit of microwave outdoor unit

Abstract

The invention relates to a RSSI circuit of an external unit of a microwave chamber, wherein, after wave filtering, amplification, frequency mixing and attenuation, inputted radio-frequency signals enter a two-level AGC circuit and then the signals are taken out of the first level AGC circuit and the second level AGC circuit and respectively amplified to be sent to an MCU. In addition, the chip output of a temperature sensor is also sent to the MCU. The MCU modifies gains, based on the signals sent by the temperature sensor and then outputs the RSSI after the superposition of two-level AGC signals is carried out. The invention has the advantages of low cost, high precision, wide application range, high reliability and small volume.

Description

technical field [0001] The invention relates to an RSSI circuit, in particular to an RSSI circuit of a microwave outdoor unit. Background technique [0002] The received signal strength indication RSSI (Received Signal Strength Indication) of the outdoor unit (ODU) of the microwave communication system is an important technical indicator of the microwave communication system, and the RSSI circuit is an important circuit unit inside the outdoor unit (ODU). [0003] The outdoor unit (ODU) of the microwave communication system generally needs an RSSI detection circuit, and the detection gives the RSSI value. The RSSI indicates the transmission power of the outdoor unit (ODU) at the opposite end, as well as the situation of the microwave transmission path, and it is also the automatic power of the microwave communication system. An important basis for the control (ATPC) function. [0004] The general RSSI detection circuit first couples part of the RF signal from the received R...

AI Technical Summary

Problems solved by technology

[0004] The general RSSI detection circuit first couples part of the RF signal from the received RF signal, then mixes it with the intrinsic frequency to obtain an intermediate frequency signal, and finally uses a special detection circuit to detect the amplitude of the signal and obtain the RSSI value. As shown in Figure 1, this technical solution requires the use of intrinsic signals, frequency mixing circuits, and special detection circuits, and has disadvantages such as complex circuits, high cost, many fault points, and large module volume.

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