Method and device for transmitting and receiving signal in microwave system

Abstract

The embodiment discloses a method and a device for transmitting / receiving signals in a microwave system, belonging to communication field. The transmitting method includes that transmitted signals are received through optical fiber, and the transmitted signals are modulated; intermediate RF transmission processing is performed on the modulated transmitted signals; the transmitted signals processed with intermediate RF processing are isolated with signals received by an antenna and transmitted by the antenna. The receiving method includes that signals received by the antenna are isolated with the transmitted signals and processed with intermediate RF transmission processing, and demodulated and transmitted through optical fiber. The transmission device comprises an optical fiber signal interface, a signal receiving module, a modulation module, an intermediate RF transmission module, a duplexer, a control module and a power supply interface. The embodiment adopts optical fiber to transmit and receive signals, and realizes large capacity microwave application; meanwhile, the cost is greatly reduced.

Description

technical field [0001] The invention relates to the communication field, in particular to a method and device for transmitting / receiving signals in a microwave system. Background technique [0002] In the microwave system, the most commonly used system design includes an indoor unit and an outdoor unit, which are installed separately and connected by an intermediate frequency cable. The signals transmitted by the cable include sending and receiving intermediate frequency signals, sending and receiving control signals and -48v power supply. See figure 1 , figure 1 It is a working principle diagram of the prior art. Such as figure 1 As shown, in the transmission direction, the transmission data is modulated by the modulation and demodulation unit 10 in the indoor unit 1, and then sent to the first intermediate frequency transmission unit 11 for mixing, filtering and amplification, and then after being combined by the combining and splitting unit 12, It is sent to the combi...

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Problems solved by technology

[0003] In large-capacity microwave applications, the signal bandwidth of the IF transceiver signal increases significantly. In practical applications, the transmitted signal will occupy a larger signal bandwidth during pre-distortion. Improvement means greater attenuation of the cable. Therefore, in the prior art, when the indoor unit and the outdoor unit are separated in this large-capacity microwave application, not only the design difficulty is greatly increased, but also the signal attenuation is greater due to the increase of the intermediate frequency frequency. It is bound to require that the attenuation of the IF cable is smaller, so the requirements for the cable are more stringent, resulting in an increase in the cost of the cable

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