Diversity receiver and terminal

Abstract

The invention discloses a diversity receiver and a terminal. The diversity receiver comprises a first main set channel and a first diversity channel. The first main set channel comprises an antenna splitting device and a first main set emission channel. The first diversity channel comprises an adjustable band pass filter and a first diversity receiving channel. The first diversity receiving channel is coupled to a diversity antenna through the adjustable band pass filter. The adjustable band pass filter is used for adjusting a pass band width of the adjustable band pass filter according to a frequency band width of a first emission signal generated by the first main set emission channel and a frequency band width of a first receiving signal received from the diversity antenna and carrying out band pass filtering based on the pass band width on the first receiving signal. By using the diversity receiver provided in the invention, receiving performance of the diversity receiver can be increased and demands of miniaturization and low cost are satisfied.

Description

technical field [0001] The present invention relates to the communication field, in particular to a diversity receiver and terminal. Background technique [0002] Since the frequency division duplex (Frequency Division Duplex, FDD) technology can support the transmitter and the receiver to work in different frequency bands, at present, the FDD technology is widely used in various wireless communication devices. However, in communication equipment using FDD technology, the transmit (Transmit, TX) signal will leak into the receiving channel where the receiver is located, which will cause second-order intermodulation distortion (second- order intermodulation distortion, IMD2) interference, which is a typical self-interference. [0003] like figure 1 As shown, in the antenna diversity receiver, the main set channel usually includes the main set receive channel (11 →21→30) and the main set transmitting channel (30→22→21→11), the transmitting signal transmitted in the main set ...

AI Technical Summary

Problems solved by technology

However, in the diversity channel formed by the diversity antenna 12, the filter 23 and the frequency mixing circuit integrated in the transceiver 30, since the diversity channel is only used for receiving signals and there is no transmitting signal, it cannot be used in a wired environment. The common practice is to use the default IP2 calibration codeword for IP2 calibration, or directly use the IP2 calibration codeword used in the main channel for IP2 calibration, and also need to use the diversity channel with a high degree of suppression and Surface Acoustic Wave (SAW) filter with fixed frequency to suppress signal leakage

The use of this calibration method leads to the fact that the receiving performance of the diversity channel of the diversity receiver cannot meet the requirements, and at the same time, it also violates the strong demand for the miniaturization and low cost of the radio frequency subsystem of the mobile terminal supporting multi-band reception

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