Simultaneous sensing and data transmission

• US 8,687,563 B2
• Filed: 12/28/2007
• Issued: 04/01/2014
• Est. Priority Date: 01/09/2007
• Status: Active Grant

• Current Assignee: STMicroelectronics Incorporated (STMicroelectronics NV)
• Original Assignee: STMicroelectronics Incorporated (STMicroelectronics NV)
• Inventors: Hu, Wendong
• Primary Examiner(s): Pollack, Melvin H
• Application Number:
  US11/966,718
• Publication Number:
  US 20080165754A1
• Time in Patent Office: 2,286 Days
• Field of Search: 370/329
• US Class Current: 370/329
• CPC Class Codes: H04W 16/14 Spectrum sharing arrangements between different networks
• CPC Class Codes: H04W 72/541 using the level of interference
• CPC Class Codes: H04W 72/542 using measured or perceived quality

Abstract

In order to satisfy the conflicting requirements for spectrum sensing and QoS of data transmission, it is highly desirable for a cognitive radio system, e.g. IEEE 802.22 WRAN, to perform spectrum sensing and data transmission simultaneously. Embodiments of the invention address critical issues of self-interference generated from a transmission unit to the co-located sensing unit when the simultaneous sensing and data transmission technique is applied. A number of interference mitigation techniques are described and analysis are given.

Claims

1. A method for use in wireless regional area network (WRAN) systems comprising:

initially performing spectrum sensing and determining a channel available for data transmission, which is the in-band channel;

initializing the in-band channel to provide the data transmission;

simultaneous with the data transmission, using channel sensors at base stations to determine the availability of out-band channels for the data transmission;

using mitigation techniques to suppress interference from the data transmission on the in-band channel into out-band channels;

managing spectrum availability, including determining if there is another out-band channel available for the data transmission;

if yes, periodically switching the data transmission to an available channel and repeating the above method steps;

and if no, then entering a non-hopping mode for the data transmission.

2. The method of claim 1, wherein the spectrum sensing is performed by match filtering.

3. The method of claim 1, wherein the spectrum sensing is performed by energy detection.

4. The method of claim 1 wherein the spectrum sensing is performed by cyclostationary feature detection.

5. The method of claim 1, wherein the interference mitigation techniques comprise a guard band, transmission power control of the transmitter, an output filter of the transmitter, an input filter of a sensing receiver, an antenna side lobe suppression, antenna polarization, an adaptive antenna, and optimization of antenna positioning.

6. A method for use in wireless regional area network (WRAN) systems comprising:

initially performing spectrum sensing and determining a channel available for data transmission, which is the in-band channel;

initializing the in-band channel to provide the data transmission;

simultaneous with the data transmission, using channel sensors to determine the availability of out-band channels for the data transmission;

using mitigation techniques at both base stations and at consumer premises equipment to suppress interference from the data transmission on the in-band channel into the out-band channels;

managing spectrum availability, including determining if there is another out-band channel available for the data transmission;

if yes, periodically switching the data transmission to an available out-band channel and repeating the above method steps;

and if no, then entering a non-hopping mode for the data transmission.

7. The method of claim 6, wherein the spectrum sensing is performed by match filtering.

8. The method of claim 6, wherein the spectrum sensing is performed by energy detection.

9. The method of claim 6, wherein the spectrum sensing is performed by cyclostationary feature detection.

10. The method of claim 6, wherein the interference mitigation techniques comprise a guard band, transmission power control of the transmitters, an output filter of the transmitters, an input filter of a sensing receiver, an antenna side lobe suppression, antenna polarization, an adaptive antenna, and optimization of antenna positioning.