TDD (time division duplex) radio-frequency receiving/emission circuit for discrete baseband signals

Abstract

The invention discloses a TDD (time division duplex) radio-frequency receiving / emission circuit for discrete baseband signals, which comprises an emission channel, a receiving channel and a feedback channel, wherein the receiving channel and the feedback channel respectively comprise a plurality of sub-channels, the number of the sub-channels corresponds to the number of sub-basebands, the sub-channels of the receiving channel and the feedback channel are in one-to-one correspondence, each sub-channel in each pair of sub-channels is provided with a filter, the pair of filters are respectively set into the state of allowing a same specific baseband signal to pass through, and each pair of sub-channels output the specific baseband signal by a common branch circuit containing an analog-digital converter; during a time slot for emission, an external signal controls each sub-channel of the feedback channel to communicate with a corresponding common branch circuit, and controls each sub-channel of the receiving channel to disconnect with a corresponding common branch circuit; and during a time slot for receiving, the control purpose is contrary. By using the circuit disclosed by the invention, the operations of carrying out multiplexing on part of components and carrying out shunted processing on a plurality of discrete sub-baseband signals through the receiving channel and the feedback channel are realized, and the effects of low cost and miniaturization are achieved.

Description

【Technical field】 [0001] The invention relates to the circuit design of a digital predistortion system in the field of wireless communication, in particular to a time division duplex radio frequency transceiver circuit for discrete frequency band signals. 【Background technique】 [0002] A radio frequency transceiver circuit applied to a digital predistortion (DPD) system usually includes three channels, which are a transmitting channel, a receiving channel and a feedback channel. In order to improve the utilization efficiency of the circuit, time-division duplexing and time-division work are usually used, and both the receiving channel and the feedback channel have the characteristics of down-conversion, and these two channels are time-division multiplexed. Related technologies have been disclosed in Chinese patents CN 201010147373.3, CN200820200031.1, CN 200710119435.8, CN 200610113368.4 and other patent documents. The common feature of these technologies is that they are ...

AI Technical Summary

Problems solved by technology

[0003] As we all know, for a broadband signal with multiple discrete sub-bands, when the interval between the sub-bands is large, a single analog-to-digital converter (A / D) at the end of the receiving channel cannot process signals of multiple sub-bands at the same time, And the various technical schemes disclosed above obviously do not consider this situation

That is to say, it is theoretically feasible to use various solutions in the prior art to transmit discrete frequency band signals, but in practice, it is limited by the inherent defects of hardware devices such as analog-to-digital converters and cannot be practical

Images