Multiple radio receive chain wireless communication devices

• US 8,095,099 B2
• Filed: 03/07/2008
• Issued: 01/10/2012
• Est. Priority Date: 03/09/2007
• Status: Active Grant

• Current Assignee: Mbit Wireless Inc.
• Original Assignee: Arumugam Govindaswamy, Bhaskar Patel, Sarath Babu Govindarajulu
• Inventors: Patel, Bhaskar, Govindswamy, Arumugam, Govindarajulu, Sarath Babu
• Primary Examiner(s): Urban, Edward
• Assistant Examiner(s): HANIDU, GANIYU A
• Application Number:
  US12/074,919
• Publication Number:
  US 20080220807A1
• Time in Patent Office: 1,404 Days
• Field of Search: 455/183.1, 455/76.78, 455/524, 455/67.11, 455/39, 455/179.1, 455/500, 455/560, 455/160.1, 455/165.1, 455132-133, 455/140, 455/146, 455/150.1, 455/88, 455/73, 455/63.3, 455/62
• US Class Current: 455/183.1
• CPC Class Codes: H04B 1/0003 Software-defined radio [SDR] systems, i.e. systems wherein components typically implemented in hardware, e.g. filters or modulators/demodulators, are implented using software, e.g. by involving an AD or DA conversion stage such that at least part of the signal processing is performed in the digital domain digital baseband systems H04L25/00; digital modulation/demodulation H04L27/00; CDMA H04B1/707; TDMA H04B7/2643; image transmission H04N5/00

Abstract

The present invention provides architectures and methods which use multiple radio receive chains in mobile devices to boost performance of the mobile devices. While a first set of the receive chains are assigned to a serving base station, another set of receive chains are dynamically allocated to neighbor base stations and/or to the serving base station depending upon present or expected system conditions and timing. A first synthesizer is configured to provide signals to the first and second set of receive chains. Other synthesizers are also configured to provide signals to the second set of receive chains. Thus, depending on the mode of operation, the second set of receive chains utilizes signals from a given synthesizer as needed. A priori data may be used to allocate specific receive chains to the serving base station, neighboring base stations or both. Unused synthesizers may be turned off to conserve power.

Claims

1. A wireless mobile station, comprising:

a baseband subsystem including a controller and a signal processing unit operatively connected to the controller, the baseband subsystem being operable to generate one or more synthesizer control signals; and

a radio frequency subsystem operatively connected to the baseband subsystem, the radio frequency subsystem including;

a transmitter operable to obtain transmit signals from the baseband subsystem, process the transmit signals and to send out the processed transmit signals from the wireless mobile station;

a plurality of synthesizers, a first one of the plurality of synthesizers being operable to generate a first local oscillating signal and a second one of the plurality of synthesizers being operable to generate a second local oscillating signal; and

a plurality of radio frequency receive chains operable to receive signals from at least one base station, to process the received signals and to send the processed received signals to the baseband subsystem, a first one of the plurality of radio frequency receive chains receiving the first local oscillating signal from the first synthesizer in a first mode of operation according to the one or more synthesizer control signals, the first radio frequency receive chain receiving the second local oscillating signal from the second synthesizer in a second mode of operation according to the one or more synthesizer control signals, and a second one of the plurality of radio frequency receive chains receiving the first local oscillating signal from the first synthesizer in both the first and second modes of operation.

2. The wireless mobile station of claim 1, further comprising a switch mechanism coupling the first and second synthesizers to the first receive chain, the switch mechanism switching between the first and second local oscillating signals based upon a switching signal from the controller.

3. The wireless mobile station of claim 1, wherein the transmitter receives the first local oscillating signal from the first synthesizer in both the first and second modes of operation.

4. The wireless mobile station of claim 1, wherein a third one of the plurality of synthesizers is operable to generate a third local oscillating signal and the transmitter receives the third local oscillating signal from the third synthesizer in both the first and second modes of operation.

5. The wireless mobile station of claim 1, wherein in the first mode of operation both the first and second receive chains are tuned to a serving base station and wherein in the second mode of operation the first receive chain is tuned to a neighbor base station and the second receive chain remains tuned to the serving base station.

6. The wireless mobile station of claim 5, wherein in the first mode of operation the second synthesizer is disabled.

7. A transceiver subsystem for use in a wireless mobile station, the transceiver subsystem comprising:

a transmitter operable to process input signals and to send out the processed input signals from the wireless mobile station;

a plurality of synthesizers, a first one of the plurality of synthesizers being operable to generate a first local oscillating signal in response to a first synthesizer control signal, and a second one of the plurality of synthesizers being operable to generate a second local oscillating signal in response to a second synthesizer control signal; and

a plurality of receive chains being operable to receive signals from at least one of a serving base station and a plurality of neighbor base stations, to process the received signals and to output the processed received signals, a first subset of the plurality of receive chains receiving the first local oscillating signal from the first synthesizer in both a first mode of operation and a second mode of operation, a second subset of the plurality of receive chains receiving the first local oscillating signal from the first synthesizer in the first mode of operation according to one or more synthesizer control signals received from a baseband subsystem, and the second subset of receive chains receiving a local oscillating signal from another one of the plurality of synthesizers in the second mode of operation according to the one or more synthesizer control signals received from the baseband subsystem.

8. The transceiver subsystem of claim 7, wherein the first subset of receive chains is dedicated to receiving the signals from the serving base station in both the first and second modes of operation, wherein the second subset of receive chains receives the signals from the serving base station in the first mode of operation and receives the signals from at least one of the neighbor base stations in the second mode of operation.

9. The transceiver subsystem of claim 7, wherein the first mode of operation is a multiple input multiple output mode of operation and the second mode of operation is a non-multiple input multiple output mode of operation.

10. The transceiver subsystem of claim 7, wherein:

the plurality of synthesizers includes a third synthesizer operable to generate a third local oscillating signal in response to a third synthesizer control signal; and

the second subset of receive chains includes a first receiver and a second receiver, the first receiver receiving the second local oscillating signal from the second synthesizer in the second mode of operation, and the second receiver receiving the third local oscillating signal from the third synthesizer in the second mode of operation.

11. The transceiver subsystem of claim 10, wherein the first and second receivers of the second subset of receive chains are dynamically allocated to tune to different ones of the neighbor base stations in the second mode of operation.

12. A wireless communication network, comprising:

a plurality of base stations arranged in a cellular configuration; and

a mobile station including;

a baseband subsystem including a controller and a signal processing unit operatively connected to the controller, the baseband subsystem being operable to generate one or more synthesizer control signals; and

a radio frequency subsystem operatively connected to the baseband subsystem, the radio frequency subsystem including;

a transmitter operable to obtain transmit signals from the baseband subsystem, process the transmit signals and to send out the processed transmit signals from the wireless mobile station;

a plurality of synthesizers, a first one of the plurality of synthesizers being operable to generate a first local oscillating signal and a second one of the plurality of synthesizers being operable to generate a second local oscillating signal;

a plurality of radio frequency receive chains operable to receive signals from at least one of the plurality of base stations, to process the received signals and to send the processed received signals to the baseband subsystem, a first one of the plurality of radio frequency receive chains receiving the first local oscillating signal from the first synthesizer in a first mode of operation to tune to a serving base station according to the one or more synthesizer control signals, the first radio frequency receive chain receiving the second local oscillating signal from the second synthesizer in a second mode of operation to tune to a neighbor base station according to the one or more synthesizer control signals, and a second one of the plurality of radio frequency receive chains receiving the first local oscillating signal from the first synthesizer in both the first and second modes of operation to tune to the serving base station;

wherein there is no transmission gap from the serving base station during the second mode of operation.