CN208986933U - It is multiplexed WCDMA, GSM diversity reception circuit in LTE diversity channel - Google Patents

Abstract

The utility model relates to a kind of WCDMA, GSM diversity reception circuits for being multiplexed LTE diversity channel.LTE radio transceiver, WCDMA/GSM RF transceiver, diversity reception channel selector circuit including being set to 4G module radio-frequency front-end, the sending and receiving end of the LTE radio transceiver is connect with a LTE dual-mode antenna, the access control terminal of LTE radio transceiver and the diversity reception channel selector circuit connection, the sending and receiving end of the WCDMA/GSM RF transceiver is connect with a WCDMA/GSM dual-mode antenna, the access control terminal of WCDMA/GSM RF transceiver and the diversity reception channel selector circuit connection, the diversity reception channel selector are also connected with a diversity reception antenna.Anti-multipath fading ability when the 4G module that the utility model circuit can reinforce is fallen after rise in call to WCDMA or GSM, the communication capacity for promoting downloading rate, optimizing weak signal covering area.

Description

It is multiplexed WCDMA, GSM diversity reception circuit in LTE diversity channel

Technical field

The utility model belongs to car networking field of communication technology, and in particular to it is a kind of be multiplexed LTE diversity channel WCDMA, GSM diversity reception circuit.

Background technique

Domestic mobile communications operator is all made of circuit domain dropping scheme at present, that is, converse when need from LTE fall after rise to WCDMA or GSM.However, since 3GPP is not strictly required the diversity reception of the 3G/2G of mobile device and cost Reason, WCDMA or GSM scheme is without diversity reception access.Common multipath fading, weak signal covering in vehicle high-speed operation Etc. under scenes, WCDMA the or GSM mobile device of no diversity access, receptivity declines rapidly.

It is defined according to 3GPP, LTE system must be equipped with diversity access.Since WCDMA, GSM frequency range are overlapped with LTE frequency range, And different systems do not work at the same time.Therefore, the diversity channel of LTE system can be used to WCDMA, GSM.To be promoted The receptivity of WCDMA, GSM scheme.

Summary of the invention

The purpose of this utility model is to provide a kind of WCDMA, GSM diversity reception circuits for being multiplexed LTE diversity channel, should Anti-multipath fading ability when the 4G module that circuit can reinforce is fallen after rise in call to WCDMA or GSM promotes downloading rate, is excellent Change the communication capacity of weak signal covering area.

To achieve the above object, the technical solution of the utility model is: a kind of WCDMA, GSM being multiplexed LTE diversity channel Diversity reception circuit, LTE radio transceiver, WCDMA/GSM RF transceiver, diversity including being set to 4G module radio-frequency front-end connect Channel selector circuit is received, the sending and receiving end of the LTE radio transceiver is connect with a LTE dual-mode antenna, and LTE radio transceiver leads to Road control terminal and the diversity reception channel selector circuit connection, the sending and receiving end and one of the WCDMA/GSM RF transceiver The connection of WCDMA/GSM dual-mode antenna, the access control terminal of WCDMA/GSM RF transceiver and diversity reception channel selector electricity Road connection, the diversity reception channel selector are also connected with a diversity reception antenna.

In an embodiment of the utility model, the diversity reception channel selector circuit includes RF switch, the filter of sound surface Wave device, the first to the 6th capacitor, first to third inductance, diversity reception antenna is through SAW filter, first capacitor, the second electricity Appearance is connect with the input terminal of RF switch, and the power end of RF switch is connected to VREG power end, the control terminal of RF switch and 4G module baseband chip connection built in 4G module radio-frequency front-end, the first output end of RF switch is through third capacitor, the 4th electricity Appearance is connected to the LTE radio transceiver, and the second output terminal of RF switch is through the 5th capacitor, the 6th capacitance connection to described WCDMA/GSM RF transceiver, the tie point of first capacitor and the second capacitor, the tie point of third capacitor and the 4th capacitor, the The tie point of five capacitors and the 6th capacitor respectively through the first inductance, the second inductance, third inductance connection to the end D_GND, open by radio frequency The ground terminal of pass, the ground terminal of SAW filter are connected to the end D_GND.

Compared to the prior art, the utility model has the following beneficial effects: the utility model circuit can strengthen 4G Anti-multipath fading ability when module is fallen after rise in call to WCDMA or GSM promotes downloading rate, optimization weak signal covering ground The communication capacity in area.

Detailed description of the invention

Fig. 1 is the utility model principle block diagram.

Fig. 2 is the utility model diversity reception channel selector circuit diagram.

Fig. 3 is the utility model LTE radio transceiver circuit schematic diagram.

Fig. 4 is the utility model WCDMA/GSM radio-frequency transceiver circuitry schematic diagram.

Specific embodiment

With reference to the accompanying drawing, the technical solution of the utility model is specifically described.

The utility model provides a kind of WCDMA, GSM diversity reception circuit for being multiplexed LTE diversity channel, including is set to 4G LTE radio transceiver (WTR1605L can be used), the WCDMA/GSM RF transceiver of module radio-frequency front-end (can be used WTR1605), diversity reception channel selector circuit, the sending and receiving end of the LTE radio transceiver are connect with a LTE dual-mode antenna, The access control terminal of LTE radio transceiver and the diversity reception channel selector circuit connection, the WCDMA/GSM radio-frequency receiving-transmitting The sending and receiving end of device is connect with a WCDMA/GSM dual-mode antenna, the access control terminal and the diversity of WCDMA/GSM RF transceiver The connection of receiving path switching circuit, the diversity reception channel selector are also connected with a diversity reception antenna.

In an embodiment of the utility model, the diversity reception channel selector circuit includes that RF switch (can be used RFSW1012), SAW filter (F6QG2G140P2KA can be used), the first to the 6th capacitor, first to third inductance, point Collect receiving antenna to connect through the input terminal of SAW filter, first capacitor, the second capacitor and RF switch, the electricity of RF switch Source is connected to VREG power end, the control terminal of RF switch and the 4G module baseband chip built in 4G module radio-frequency front-end, leads to Cross GPIO(universal input/output) port controlling connection, the first output end of RF switch is through third capacitor, the 4th capacitance connection To the LTE radio transceiver, the second output terminal of RF switch is through the 5th capacitor, the 6th capacitance connection to the WCDMA/ GSM RF transceiver, first capacitor and the tie point of the second capacitor, the tie point of third capacitor and the 4th capacitor, the 5th capacitor Respectively through the first inductance, the second inductance, third inductance connection to the end D_GND, RF switch connects tie point with the 6th capacitor Ground terminal, SAW filter ground terminal be connected to the end D_GND.

The following are the specific implementation examples of the utility model.

As shown in Figure 1, the system of WCDMA, GSM diversity reception circuit for the multiplexing LTE diversity channel of the utility model Block diagram, the system are double standby module radio-frequency front-end, can carry out LTE data communication simultaneously and WCDMA/GSM converses.Only carrying out When LTE data communication, diversity reception channel selector is beaten to LTE radio transceiver, it can be ensured that the high sensitivity of LTE, high-throughput.

In call, communication is fallen after rise to WCDMA/GSM.Due to conversing more preferential than data communication for vehicular applications Grade is high, especially when carrying out distress call, therefore, to assure that speech quality and stability.Therefore, diversity reception channel selector at this time It beats to WCDMA, GSM RF transceiver, the anti-multipath fading ability in call can be reinforced, promote downloading rate, optimization weak signal The communication capacity of covering area.Simultaneously because be multiplexed LTE radio receiving path, improving performance simultaneously, do not improve how much Cost.

The physical circuit schematic diagram of WCDMA, GSM diversity reception circuit in the multiplexing LTE diversity channel of the utility model is such as Shown in Fig. 2-4, the LTE diversity reception circuit of the utility model includes U1 SAW filter (SAW filter) and its surrounding Impedance matching circuit C1, L1, C2.When only carrying out LTE data communication, pass through U2 RF swich(RF switch), by LTE points Collect signal, conduction to LTE radio transceiver U3A.

When carry out converse or be used only WCDMA/GSM when, due to the same frequency range of LTE, U1 SAW filter can be multiplexed (SAW filter) and its surrounding impedance matching circuit C1, L1, C2.U2 RF swich(RF switch is controlled simultaneously), it will WCDMA/GSM diversity signal, conduction to WCDMA/GSM RF transceiver U4A.

U1 selects the SAW filter of filter with low insertion loss, high out-of-side rejection, to reduce the noise coefficient of receiving path.

Since in the design, radio-frequency transmitter uses Direct-conversion scheme, and therefore, U2 needs to select high-isolation The RF switch of (30dB or so), the local oscillator leakage to avoid RF transceiver U3A, U4A cause mutual interference.

It is the preferred embodiment of the utility model above, it is all to change according to made by technical solutions of the utility model, it is produced Function without departing from technical solutions of the utility model range when, belong to the protection scope of the utility model.

Claims (2)

1. a kind of WCDMA, GSM diversity reception circuit for being multiplexed LTE diversity channel, which is characterized in that penetrated including being set to 4G module LTE radio transceiver, WCDMA/GSM RF transceiver, the diversity reception channel selector circuit of frequency front end, the LTE radio are received The sending and receiving end of hair device is connect with a LTE dual-mode antenna, and the access control terminal of LTE radio transceiver is opened with the diversity reception access Circuit connection is closed, the sending and receiving end of the WCDMA/GSM RF transceiver is connect with a WCDMA/GSM dual-mode antenna, WCDMA/GSM The access control terminal of RF transceiver and the diversity reception channel selector circuit connection, the diversity reception channel selector also connect It is connected to a diversity reception antenna.

2. WCDMA, GSM diversity reception circuit in multiplexing LTE diversity channel according to claim 1, which is characterized in that institute Stating diversity reception channel selector circuit includes RF switch, SAW filter, the first to the 6th capacitor, first to third electricity Sense, diversity reception antenna are connected through the input terminal of SAW filter, first capacitor, the second capacitor and RF switch, and radio frequency is opened The power end of pass is connected to VREG power end, the control terminal of RF switch and the 4G module base band core built in 4G module radio-frequency front-end Piece connection, the first output end of RF switch through third capacitor, the 4th capacitance connection to the LTE radio transceiver, open by radio frequency The second output terminal of pass is through the 5th capacitor, the 6th capacitance connection to the WCDMA/GSM RF transceiver, first capacitor and second The tie point of capacitor, the tie point of third capacitor and the 4th capacitor, the 5th capacitor and the 6th capacitor tie point respectively through first Inductance, the second inductance, third inductance connection to the end D_GND, the ground terminal connection of the ground terminal, SAW filter of RF switch To the end D_GND.