Multimode Receiver And Receiving Method Therefor

• US 20150295739A1
• Filed: 08/14/2013
• Published: 10/15/2015
• Est. Priority Date: 11/05/2012
• Status: Active Grant

• Current Assignee: ZTE Corporation
• Original Assignee: ZTE Corporation
• Inventors: Liu, Haiguang
• Granted Patent: US 9,634,872 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• 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 system, one or more receiving circuit front ends, an In-phase/Quadrature I/Q demodulator, and a baseband unit, wherein

the antenna system is configured for:

receiving a signal sent by a base station BS, sending the signal sent by the BS to a receiving circuit front end of the one or more receiving circuit front ends that corresponds to a frequency band of the signal sent by the BS;

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

receiving a signal sent by the antenna system, performing down-conversion on the signal sent by the antenna system, and sending the down-converted signal to the I/Q demodulator;

the I/Q demodulator is configured for;

receiving a signal sent by one of the one or more receiving circuit front ends, demodulating the signal sent by one of the one or more receiving circuit front ends, and sending the demodulated signal to the baseband unit; and

the baseband unit is configured for;

decoding the demodulated signal.

2. The multi-mode receiver according to claim 1, further comprising a protocol detecting device, wherein

the antenna system is further configured for:

sending the signal sent by the BS to the protocol detecting device;

the protocol detecting device is configured for;

receiving a signal sent by the antenna system, detecting the signal sent by the antenna system, and selecting a transmission mode and a decoding mode for the demodulated signal according to synchronization information of the signal sending BS side;

the I/Q demodulator is configured for;

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.

3. The multi-mode receiver according to claim 2, wherein the antenna system comprises an antenna and an antenna switch, wherein

the antenna is configured for:

receiving the signal sent by the BS, and transferring the signal sent by the BS to the antenna switch; and

the antenna switch is configured for;

receiving a signal transferred by the antenna, sending the signal transferred by the antenna to the receiving circuit front end corresponding to the frequency band of the signal transferred by the antenna, and sending the signal sent by the BS to the protocol detecting device which then detects the received signal.

4. 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 sent by the antenna system, performing down-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 sent by the antenna system, performing down-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 sent by the antenna system, performing down-conversion on the third signal, sending the down-converted third signal to the I/Q demodulator.

5. The multi-mode receiver according to claim 4, 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.

11. The multi-mode receiver according to claim 2, 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 sent by the antenna system, performing down-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 sent by the antenna system, performing down-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 sent by the antenna system, performing down-conversion on the third signal, sending the down-converted third signal to the I/Q demodulator.

12. The multi-mode receiver according to claim 11, 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.

13. The multi-mode receiver according to claim 3, 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 sent by the antenna system, performing down-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 sent by the antenna system, performing down-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 sent by the antenna system, performing down-conversion on the third signal, sending the down-converted third signal to the I/Q demodulator.

14. The multi-mode receiver according to claim 13, 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.

6. A receiving method for a multi-mode receiver, comprising:

receiving a signal sent by a base station BS;

performing frequency conversion on the signal using a receiving circuit front end corresponding to a frequency band of the signal; and

performing I/Q demodulation on the frequency-converted signal, and decoding the demodulated signal.

7. The method according to claim 6, wherein the frequency conversion comprises filtering, amplification, down-conversion, Intermediate-Frequency IF filtering, and IF amplification.

8. The method according to claim 6, further comprising:

detecting the signal sent by the BS.

9. The method according to claim 8, wherein the detecting the signal sent by the BS comprises:

selecting a transmission mode and a decoding mode for a demodulated I/Q signal according to synchronization information of the signal sending BS side; and

the decoding the demodulated signal comprises;

decoding the demodulated signal in the selected decoding mode.

10. The method according to claim 9, wherein the selecting a transmission mode and a decoding mode for a demodulated I/Q 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.

15. The method according to claim 7, further comprising:

detecting the signal sent by the BS.

16. The method according to claim 15, wherein the detecting the signal sent by the BS comprises:

selecting a transmission mode and a decoding mode for a demodulated I/Q signal according to synchronization information of the signal sending BS side; and

the decoding the demodulated signal comprises;

decoding the demodulated signal in the selected decoding mode.

17. The method according to claim 16, wherein the selecting a transmission mode and a decoding mode for a demodulated I/Q 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.