Multimode receiver and receiving method therefor

• US 9,634,872 B2
• Filed: 08/14/2013
• Issued: 04/25/2017
• Est. Priority Date: 11/05/2012
• Status: Active Grant

• Current Assignee: ZTE Corporation
• Original Assignee: ZTE Corporation
• Inventors: Liu, Haiguang
• Primary Examiner(s): KASSA, ZEWDU A
• Application Number:
  US14/439,602
• Publication Number:
  US 20150295739A1
• Time in Patent Office: 1,350 Days
• Field of Search: 375340, 375316, 375295, 375219
• CPC Class Codes: G10L 2015/025 Phonemes, fenemes or fenones being the recognition units
• CPC Class Codes: H04B 1/006 using switches for selecting the desired band H04B1/0057 takes precedence
• CPC Class Codes: H04B 1/18 Input circuits, e.g. for coupling to an antenna or a transmission line coupling networks between antennas or lines and receivers independent of the nature of the receiver H03H
• CPC Class Codes: H04B 1/401 for selecting or indicating operating mode
• CPC Class Codes: H04L 25/02 Details ; arrangements for supplying electrical power along data transmission lines systems for transmitting signals via power distribution lines H04B3/54
• CPC Class Codes: H04L 27/14 Demodulator circuits; Receiver circuits
• CPC Class Codes: H04W 88/06 adapted for operation in multiple networks or having at least two operational modes, e.g. multi-mode terminals

Abstract

Disclosed is a multimode receiver, comprising: an antenna system configured to receive a signal sent by a base station and select a receiving circuit front end according to the frequency band of the signal; more than one receiving circuit front end configured to perform down-conversion frequency processing on a signal sent by the antenna system and send the processed signal to an I/Q demodulator; the I/Q demodulator configured to demodulate the signal sent by the receiving circuit front ends and send the demodulated signal to a baseband unit; and the baseband unit configured to decode the demodulated signal. Disclosed is a receiving method for a multimode receiver. By adopting the present invention, one set of receiving circuit front ends can be utilized for signals of the same frequency band and different modes, decreasing the number of radio-frequency chips, and lowering the cost.

Claims

1. A multi-mode receiver, comprising an antenna, an antenna switch, one or more receiving circuit front ends in parallel, a protocol detecting device, an In-phase/Quadrature I/Q demodulator, and a baseband unit, the antenna being connected to one end of the antenna switch, the other end of the antenna switch being connected to an input of the protocol detecting device, a first output of the protocol detecting device being connected to an input of the I/Q demodulator, a second output of the protocol detecting device being connected to an input of the baseband unit, the other end of the antenna switch further being connected to input of the one or more receiving circuit front ends, the input of the I/Q demodulator further being connected to output of the one or more receiving circuit front ends, wherein

the antenna is configured for:

receiving a signal sent by a base station BS, and transferring the signal sent by the BS to the antenna switch, the signal sent by the BS being in a mode and in a frequency band;

the antenna switch is configured for;

receiving the signal received by the antenna, forwarding the signal received by the antenna to a receiving circuit front end of the one or more receiving circuit front ends that corresponds to the frequency band of the signal received by the antenna, and sending the signal received by the antenna to the protocol detecting device;

each of the one or more receiving circuit front ends is configured for;

receiving the signal received by the antenna forwarded by the antenna switch, performing frequency conversion on the signal received by the antenna, and sending the down-converted signal to the I/Q demodulator, the frequency conversion comprising filtering, amplification, down-conversion, Intermediate-Frequency IF filtering, and IF amplification;

the protocol detecting device is configured for;

receiving and detecting the signal received by the antenna;

determining, according to synchronization information of the signal-sending BS side, the mode of the signal received by the antenna;

selecting, according to the determined mode of the signal received by the antenna, a transmission mode for transmitting a demodulated signal and a decoding mode for decoding the demodulated signal;

informing the I/Q demodulator of the selected transmission mode;

informing the baseband unit of the selected decoding mode;

the I/Q demodulator is configured for;

receiving and demodulating the down-converted signal;

sending the demodulated signal to the baseband unit according to the transmission mode selected by the protocol detecting device; and

the baseband unit is configured for;

decoding the demodulated signal in the decoding mode selected by the protocol detecting device.

2. The multi-mode receiver according to claim 1, wherein the one or more receiving circuit front ends comprise a first receiving circuit front end, a second receiving circuit front end, and a third receiving circuit front end, wherein

the first receiving circuit front end is configured for:

receiving a first signal in a first frequency band received by the antenna forwarded by the antenna switch, performing the frequency conversion on the first signal, sending the down-converted first signal to the I/Q demodulator;

the second receiving circuit front end is configured for;

receiving a second signal in a second frequency band received by the antenna forwarded by the antenna switch, performing the frequency conversion on the second signal, sending the down-converted second signal to the I/Q demodulator;

the third receiving circuit front end is configured for;

receiving a third signal in a third frequency band received by the antenna forwarded by the antenna switch, performing the frequency conversion on the third signal, sending the down-converted third signal to the I/Q demodulator.

3. The multi-mode receiver according to claim 2, wherein each of the first signal, the second signal, and the third signal comprises a group of same-band signals in different modes;

the first frequency band, the second frequency band, and the third frequency band differ from each other.

4. A receiving method for a multi-mode receiver, the multi-mode receiver comprising an antenna, an antenna switch, one or more receiving circuit front ends in parallel, a protocol detecting device, an In-phase/Quadrature I/Q demodulator, and a baseband unit, the antenna being connected to one end of the antenna switch, the other end of the antenna switch being connected to an input of the protocol detecting device, a first output of the protocol detecting device being connected to an input of the I/Q demodulator, a second output of the protocol detecting device being connected to an input of the baseband unit, the other end of the antenna switch further being connected to input of the one or more receiving circuit front ends, the input of the I/Q demodulator further being connected to output of the one or more receiving circuit front ends, the method comprising:

receiving, by the antenna, a signal sent by a base station BS, and transferring the signal sent by the BS to the antenna switch, the signal sent by the BS being in a mode and in a frequency band;

forwarding, by the antenna switch, the signal received by the antenna to a receiving circuit front end of the one or more receiving circuit front ends that corresponds to the frequency band of the signal received by the antenna, and sending the signal received by the antenna to the protocol detecting device;

performing, by the receiving circuit front end corresponding to the frequency band of the signal received by the antenna, frequency conversion on the signal received by the antenna, and sending the down-converted signal to the I/Q demodulator, the frequency conversion comprising filtering, amplification, down-conversion, Intermediate-Frequency IF filtering, and IF amplification;

detecting, by the protocol detecting device, the signal received by the antenna;

determining, according to synchronization information of the signal-sending BS side, the mode of the signal received by the antenna;

selecting, according to the determined mode of the signal received by the antenna, a transmission mode for transmitting a demodulated signal and a decoding mode for decoding the demodulated signal;

informing the I/Q demodulator of the selected transmission mode;

informing the baseband unit of the selected decoding mode;

demodulating, by the I/Q demodulator, the down-converted signal;

sending the demodulated signal to the baseband unit according to the transmission mode selected by the protocol detecting device;

decoding, by the baseband unit, the demodulated signal in the decoding mode selected by the protocol detecting device.

5. The method according to claim 4, wherein the selecting, according to the determined mode of the signal received by the antenna, a transmission mode for transmitting a demodulated signal and a decoding mode for decoding the demodulated signal comprises:

automatically matching a Global System of Mobile communication GSM signal with a transmission mode of a Digital Radio Frequency DigRF interface protocol;

automatically matching a Time Division-Synchronous Code Division Multiple Access TD-SCDMA signal with a 10-bit parallel-port data transmission mode; and

automatically matching a Time Division Long Term Evolution TD-LTE signal with a 12-bit parallel-port data transmission mode; and

decoding each of the GSM signal, the TD-SCDMA signal, and the TD-LTE signal using a data processing unit corresponding to the each of the GSM signal, the TD-SCDMA signal, and the TD-LTE signal.