Network end signal emitting device of time division-long term evolution (TD-LTE) system

Abstract

The invention relates to a network end signal emitting device of a time division-long term evolution (TD-LTE) system. The network end signal emitting device comprises a modulation carrier wave unit used for generating TD-LTE modulation carrier wave signals, wherein the output end of the modulation carrier wave unit is connected with the input end of a frequency mixing filtering unit used for generating radio frequency (RF) signals, the output end of the frequency mixing filtering unit is connected with the input end of a switch filtering amplification unit, the output end of the switch filtering amplification unit is connected with the input end of a program control attenuator unit through a fixed amplitude amplifying unit, and the output end of the program control attenuator unit is connected with the input end of a multi-path output matching unit used for outputting multiple paths of LTE signals. The multi-time frequency conversion can meet the output frequency range requirement of the signal output, the switch filter and the frequency fixing filtering are utilized, the low stray requirements of output signals are met, high-accuracy requirements of the signal output power can be met through a fixed amplitude loop, the signal output maximum power requirement is met through multi-stage amplification, and the low-power step and large-dynamic-range requirements are realized through the combination of the fixed amplitude amplification unit and the program control attenuator.

Description

technical field [0001] The invention relates to the field of TD-LTE systems, in particular to a network terminal signal transmitting device of the TD-LTE system. Background technique [0002] TD-LTE terminal radio frequency conformance test is one of the most critical conformance tests in the communication industry. There are strict regulations on 3GPP standards and TD-LTE national industry standards. R&D, design verification, production, and RF fault location play a very important role. my country requires that the TD-LTE signal output by the TD-LTE terminal radio frequency conformance test equipment has a power range of 0dBm~-120dBm, a power accuracy of 0.8dB, and a signal bandwidth greater than 20MHz. Therefore, how to generate low noise and low spurious , large dynamic range, and multi-channel TD-LTE signals have become the research frontier in the field of TD-LTE terminal RF conformance testing. [0003] There are many existing radio frequency transmission methods, and...

AI Technical Summary

Problems solved by technology

[0003] There are many existing radio frequency transmission methods, and there are few transmissions for the network end of the LTE system. Most of them are for ordinary signal transmission. The ordinary radio frequency transmission method is only for continuous signals. A large dynamic burst signal with wide information bandwidth and peak-to-average ratio, using ordinary transmission methods will cause signal distortion, power instability, and normal demodulation.

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