Reducing effects of self-created interference on broadband reception

• US 20040157578A1
• Filed: 12/05/2003
• Published: 08/12/2004
• Est. Priority Date: 06/08/2001
• Status: Active Grant

• Current Assignee: RPX Corporation
• Original Assignee: Nokia Corporation
• Inventors: Auranen, Tommi
• Granted Patent: US 7,227,917 B2
• Time in Patent Office: Days
• US Class Current: 455/278.1
• CPC Class Codes: H04L 27/2647 Arrangements specific to the receiver only equalisation H04L27/01

Abstract

The invention relates to a method for reducing effects of self-created digital radio frequency interference on broadband reception. In the method a DVB-T (Digital Video Broadcasting—Terrestrial) signal is received at a broadband receiver (200). The received signal is demodulated in a demodulation process. Information (210) on frequencies of self-created digital radio frequency interference is provided for the broadband reception. The information has been generated based on prior measurements and stored to a memory prior to the receiving of the DVB-T signal. The information is used in the broadband reception so as to reduce the effects of the self-created digital radio frequency interference on the broadband reception.

Claims

1. A method for reducing effects of self-created radio frequency interference on broadband reception, the method comprising:

receiving a broadband signal at a broadband receiver;

demodulating the received broadband signal in a demodulation process, the demodulation process being a part of the broadband reception, characterised by the method comprising;

providing for the broadband reception information on frequencies of self-created radio frequency interference the information having been generated and stored in a memory prior to the receiving of the broadband signal, the memory being accessible to the broadband receiver; and

using the information in the broadband reception so as to reduce the effects of the self-created radio frequency interference on the broadband reception.

2. A method according to claim 1, wherein the method comprises:

using the information in the demodulation process in order to reduce the effects of the self-created radio frequency interference on the demodulation process.

3. A method according to claim 1 or 2, wherein the broadband signal is a multi-carrier modulated signal and the information is used to cancel, in the demodulation process, a carrier which is interfered by the self-created radio frequency interference.

4. A method according to claim 3, wherein the interfered carrier frequency is cancelled by carrying out an algorithm.

5. A method according to any of the preceding claims, wherein the broadband signal is a multi-carrier modulated signal and the information is used to weight each of the carriers in the demodulation process so as to reduce the effects of the self-created radio frequency interference on the demodulation process.

6. A method according to claim 5, wherein the weighting is carded out by giving to each of the carriers a weighted value so that to an interfered carrier is given a lower value than to those carriers that are not interfered by the self-created radio frequency interference.

7. A method according to any of the preceding claims, wherein the method comprises:

converting the received broadband signal from an analog form to a digital form the conversion being based on a conversion window;

controlling the size of the conversion window; and

using the information on the self-created radio frequency interference in the control of the size of the conversion window so as to allow the conversion window to clip during the self-created radio frequency interference for improving sensitivity of the demodulation process.

8. A method according to any of the preceding claims, wherein the self-created radio frequency interference is coming from the broadband receiver itself or from a device in which the broadband receiver is located.

9. A method according to any of the preceding claims, wherein the self-created radio frequency interference is coupled to an internal antenna of the broadband receiver.

10. A method according to any of the preceding claims, wherein the broadband receiver is located in a mobile communication device so as to form a portable hand-held device suitable for broadband reception.

11. A method according to any of the preceding claims, wherein the broadband receiver is one of the following:

a DVB-T (Digital Video Broadcasting-Terrestrial) receiver, an ISDB-T (Integrated Services Digital Broadcasting—

Terrestrial) receiver.

12. A method according to any of the preceding claims, wherein the received broadband signal comprises at least one of the following:

digital video stream, IP (Internet Protocol) packet stream, IP multicast packets.

13. A method according to to any of the preceding claims, wherein the method comprises:

receiving the broadband signal at a particular radio channel; and

providing for the broadband reception information on self-created radio frequency interference at the particular radio channel.

14. A broadband receiver (200) for reducing effects of self-created radio frequency interference on broadband reception, the broadband receiver comprising:

an antenna for receiving a broadband signal at the broadband receiver;

a demodulator (209) for demodulating the received broadband signal in a demodulation process, the demodulation process being a part of the broadband reception, characterised by the broadband receiver further comprising;

a memory in the broadband receiver or in connection to the broadband receiver for storing information (210) on frequencies of self-created radio frequency interference for the broadband reception the information having been generated prior to the receiving of the broadband signal, the broadband receiver being configured to;

use the information in the broadband reception so as to reduce the effects of the self-created radio frequency interference on the broadband reception.

15. A broadband receiver according to claim 14, wherein the broadband receiver is configured to:

use the information in the demodulation process in order to reduce the effects of the self-created radio frequency interference on the demodulation process.

16. A communication device (80) comprising a broadband receiver (200) for reducing effects of self-created radio frequency interference on broadband reception, the broadband receiver comprising:

an antenna for receiving a broadband signal at the broadband receiver;

a demodulator (209) for demodulating the received broadband signal in a demodulation process, the demodulation process being a part of the broadband reception, characterised by the broadband receiver further comprising;

a memory in the broadband receiver or in connection to the broadband receiver for storing information (210) on frequencies of self-created radio frequency interference for the broadband reception the information having been generated prior to the receiving of the broadband signal, the broadband receiver being configured to;

use the information in the broadband reception so as to reduce the effects of the self-created radio frequency interference on the broadband reception.

17. A communication device according to claim 16, wherein the communication device is a mobile communication device comprising, in addition to the broadband receiver, a cellular network interface (87) for communicating information with a cellular network.