Signal transmitting method and signal transmitting device

Abstract

The invention discloses a signal transmitting method. The signal transmitting method includes: receiving a baseband signal and transmitting the baseband signal to a radio-frequency analog conversion module used for integrating a quadrature modulator with a numerically-controlled oscillator; sampling the baseband signal through the radio-frequency analog conversion module according to the default rate; converting the baseband signal according to sampling results and outputting a radio-frequency signal covering dual frequency bands or multiple frequency bands. The invention further discloses a signal transmitting device. By the arrangement, the baseband signal is directly converted into the radio-frequency signal through the radio-frequency analog conversion module, area of a printed-circuit board is reduced as compared to converting the baseband signal into the radio-frequency signal through an intermediate-frequency filter and a modulator, and cost of the device is lowered.

Description

technical field [0001] The present invention relates to the field of communication technology, in particular to a signal transmitting method and device. Background technique [0002] At present, the LTE (Long Term Evolution, Long Term Evolution) network that has been commercialized in the world has been very developed, and many operators are faced with the problem of how to deal with the coexistence of multiple standards and multiple frequency bands of 2G / 3G / LTE. In order to build and expand the network, operators are looking for locations to install base stations or RRUs (Radio Remote Units) in limited site space and sky space, which makes how to use limited site space and reduce sky space Quantity has become the focus of operators, and equipment miniaturization and compact design and ultra-broadband technology have become the needs of customers. [0003] However, if the current ultra-wideband communication system wants to cover dual-band or multiple frequency bands, it wi...

AI Technical Summary

Problems solved by technology

Due to this method, there will be the following problems: (1) using the zero intermediate frequency scheme, the image signals of the two frequency bands will affect each other; (2) the low intermediate frequency scheme can avoid the mutual influence of the image signals, but the second harmonic will interfere with the transmitting frequency band

Moreover, the link of the digital-to-analog conversion + quadrature modulator + combiner architecture of this solution is relatively complicated, resulting in a large area of ​​printed circuit boards for implementing this solution, resulting in a large RRU volume, which greatly increases equipment production, logistics, and inventory. and maintenance costs

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