ROF-based novel base station feedback receiving and transmit-receive calibrating multiplexing circuit

Abstract

The invention relates to an ROF (Radio Over Fiber)-based novel base station feedback receiving and transmit-receive calibrating multiplexing circuit. The multiplexing circuit comprises a BBU module and an active antenna module, wherein an RF (Radio Frequency) small signal subjected to digital signal processing of the BBU module is coupled with an analog optical fiber for transmission through TRX channels of eight RF transceiver circuits and an analog optical module; a TDD (Time Division Duplex) time-division switching signal of the BBU module is transmitted to the active antenna module; the active antenna module amplifies the RF small signal through a power amplifier (PA) and then covers the amplified signal, an antenna coupling disc provides a coupling channel for transmit-receive calibration, and the switching state is selected according to the TDD property. The ROF-based novel base station feedback receiving and transmit-receive calibrating multiplexing circuit has the benefits that by utilizing the ROF technology, smooth capacity expansion can be realized without replacing devices, and the interface part has no cost increase. The ROF-based novel base station feedback receiving and transmit-receive calibrating multiplexing circuit adopts the switching manner to realize multiplexing of the feedback receiving and transmit-receive calibrating circuit according to the transmit-receive time division property of the TDD system, thereby simplifying the circuit and lowering the cost.

Description

technical field [0001] The invention belongs to the field of mobile communication network optimization, and mainly relates to a novel ROF-based base station feedback receiving, sending and receiving calibration multiplexing circuit. Background technique [0002] With the gradual rise of high-speed mobile Internet, 3G and 4G networks began to rise, and the explosive growth of data services caused the data transmission between traditional BBU and RRU to increase exponentially. For the multi-channel, multi-carrier 8-channel TD-SCDMA system and For the subsequent 8-channel TD-LTE system, the optical fiber rate has reached 10Gbps. If the carrier capacity needs to be increased in the future, a higher-speed optical fiber rate is required. At present, 10Gbps digital optical modules and high-speed digital interface chips are quite expensive, and "expansion" leads to a high cost increase caused by the increase in fiber rate; at the same time, the current DPD feedback circuit and trans...

AI Technical Summary

Problems solved by technology

At present, 10Gbps digital optical modules and high-speed digital interface chips are quite expensive, and "capacity expansion" leads to a high cost increase caused by the increase in fiber rate; at the same time, the current DPD feedback circuit and transceiver calibration functions in the traditional RRU need to be implemented in a separate circuit, and the entire circuit realizes Complicated and expensive

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