WiMAX (World Interoperability for Microwave Access) radio frequency front-end standing wave detection system and method

Abstract

The invention discloses a WiMAX (World Interoperability for Microwave Access) radio frequency front-end standing wave detection system and method. The WiMAX radio frequency front-end standing wave detection system comprises an amplifier, a directional coupler, an attenuator, detecting circuits, a logic-arithmetic unit and an indicator, wherein one path of output of the directional coupler is connected with a positive detecting circuit through the attenuator, and the other path of output of the directional coupler is connected with a reverse detecting circuit through the attenuator; and the detecting circuits are respectively connected with the logic-arithmetic unit. The method comprises the following steps that a radio-frequency signal is transmitted to an antenna through the directional coupler after the radio-frequency signal is amplified; one part of signals of the directional coupler is attenuated and then is sent to the positive detecting circuit to be detected into stable direct-current level; the other part of signals of the directional coupler is attenuated and then is sent to the reverse detecting circuit to be detected and to be used as comparative level; the direct-current level is sent to the logic-arithmetic unit to be used as reference level; and the logic-arithmetic unit obtains an accurate standing wave value through logical operation to be input into the indicator. The accuracy of output standing wave detection of a power amplification module is high, the real-time monitoring of the power amplification module is realized, and the using safety of equipment and the running stability of the system are increased.

Description

technical field [0001] The invention relates to a WiMAX radio frequency front-end standing wave detection system and method. Background technique [0002] WiMAX is an emerging wireless communication technology that provides high-speed Internet-oriented connections. WiMAX's wireless signal transmission distance can reach up to 50 kilometers, and its network coverage area is 10 times that of 3G base stations. According to data, "WiMAX" has become the most searched communication keyword on the Internet recently. This technology has become the new darling of the wireless industry because of its long-distance coverage and high bandwidth characteristics. [0003] The full name of WiMAX is World Interoperability for Microwave Access, which is the global interoperability system for microwave access. It is a Broadband Wireless Access Metropolitan Area Network (BWAMAN) technology based on the IEEE 802.16 standard. WiMAX is also often referred to as IEEE Wireless MAN (Metropolitan Ar...

AI Technical Summary

Problems solved by technology

[0006] The traditional standing wave detection circuit is realized by using the diode half-wave rectification characteristics. Its output detection voltage is proportional to the input voltage and has an exponential relationship with the input power. +10~+15dBm) can have very good performance, but when the input power is reduced, its performance will deteriorate sharply. Therefore, when the peak-to-average power ratio of the transmitted signal is not fixed, it is difficult to achieve accurate power In addition, the operating frequency band of the diode detection circuit is relatively narrow, which will cause the deterioration of the flatness of the detection when it is applied in a broadband application, resulting in the unsatisfactory consistency of the detection value in the entire frequency band; in the process of engineering application, traditional equipment usually passes Relevant testing instruments are used to test it, but it can only test whether the indicators of each component meet the requirements, and it is difficult to ensure that the matching between the systems of each component is good

Images