SYSTEM AND METHOD FOR SELECTIVELY REJECTING FREQUENCY BANDS IN WIRELESS COMMUNICATION SYSTEMS

• US 20090075644A1
• Filed: 09/19/2007
• Published: 03/19/2009
• Est. Priority Date: 09/19/2007
• Status: Abandoned Application

• Current Assignee: CommScope Technologies, LLC (CommScope Holding Company, Inc.)
• Original Assignee: ADC Telecommunications Incorporated (TE Connectivity Limited)
• Inventors: Hermel, Michael J.
• Application Number:
  US11/857,537
• Publication Number:
  US 20090075644A1
• Time in Patent Office: Days
• US Class Current: 455/422.100
• CPC Class Codes: H04B 1/0475 with means for limiting noise, interference or distortion H04B1/0483 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 1/50 using different frequencies for the two directions of communication

Abstract

A system and method for selectively rejecting frequency bands in wireless communication systems are disclosed. For example, the system provides a software-selective band rejection technique using multiple cascaded band rejection filters that can remove undesired sub-bands within the RF pass band of the wireless communication system, subsystem or network involved. Thus, the system enables the remaining or desired sub-bands in that RF pass band to be passed. Consequently, the software-oriented band rejection approach enables a designer, operator or user to rapidly configure or reconfigure its designated bands or sub-bands (e.g., on an application-by-application basis) without having to procure and install new bandpass filter hardware or other filter hardware.

Claims

1. A system for selectively rejecting frequency bands in a wireless communication system, comprising:

a base unit;

a transmitter unit; and

a programmable band rejection unit coupled to the base unit and the transmitter unit, wherein the programmable band rejection unit is configured to;

selectively reject at least one predetermined band of frequencies from a plurality of bands of frequencies included in signals received from the base unit.

2. The system of claim 1, wherein the programmable band rejection unit is further configured to:

pass signals including a remainder of the plurality of bands of frequencies to the transmitter unit.

3. The system of claim 1, further comprising:

a receiver unit; and

a second programmable band rejection unit connected between the receiver unit and the base unit, wherein the second programmable band rejection unit is configured to;

selectively reject at least one predetermined band of frequencies from a second plurality of bands of frequencies included in signals received from the receiver unit.

4. The system of claim 3, wherein the second programmable band rejection unit is further configured to:

pass signals including a remainder of the second plurality of bands of frequencies to the receiver unit.

5. The system of claim 1, wherein the programmable band rejection unit comprises a plurality of programmable notch filters.

6. The system of claim 1, wherein the programmable band rejection unit comprises:

a plurality of programmable notch filters; and

a digital processor unit coupled to each programmable notch filter of the plurality of programmable notch filters.

7. The system of claim 1, further comprising:

a plurality of programmable notch filters; and

a digital processor unit co-located with and coupled to each programmable notch filter of the plurality of programmable notch filters, wherein the digital processor unit is configured to;

control a band rejection function of each programmable notch filter.

8. The system of claim 1, wherein the plurality of bands of frequencies comprises an RF pass band.

9. The system of claim 1, wherein the plurality of programmable notch filters comprises an RF transport device.

10. The system of claim 1, wherein the wireless communication system comprises a cellular communication system, the base unit comprises a base station, and the transmitter unit comprises an RF coverage transmit antenna.

11. A system for selectively rejecting sub-bands of frequencies in a wireless communication system, comprising:

a base station;

an RF coverage antenna subsystem; and

a plurality of programmable band rejection filters coupled to the base station and the RF coverage antenna subsystem, wherein the plurality of programmable band rejection filters is configured to;

select at least one sub-band of frequencies from a plurality of sub-bands of frequencies included in signals received from the base station; and

remove the at least one sub-band of frequencies from the plurality of sub-bands of frequencies.

12. The system of claim 11, wherein the plurality of programmable band rejection filters is further configured to:

pass a remainder of the plurality of sub-bands of frequencies to the RF coverage antenna subsystem.

13. The system of claim 11, wherein the plurality of programmable band rejection filters comprises a plurality of software-executable notch filters.

14. The system of claim 11, wherein the plurality of programmable band rejection filters is further configured to:

select at least one sub-band of frequencies from a second plurality of sub-bands of frequencies included in signals received from the RF coverage antenna subsystem; and

remove the at least one sub-band of frequencies from the second plurality of sub-bands of frequencies.

15. The system of claim 11, further comprising:

a digital processor coupled to the plurality of programmable band rejection filters and configured to;

control a filter function of each band rejection filter of the plurality of programmable band rejection filters.

16. A method for processing sub-bands of frequencies in a wireless communication system, comprising the steps of:

receiving signals including a plurality of sub-bands of frequencies;

selecting at least one sub-band of frequencies from the plurality of sub-bands of frequencies;

removing the at least one sub-band of frequencies from the plurality of sub-bands of frequencies; and

outputting signals including the plurality of sub-bands of frequencies minus the at least one sub-band of frequencies.

17. The method of claim 16, wherein the selecting step is performed by a digital processor.

18. The method of claim 16, wherein the removing step is performed by a plurality of programmable band rejection filters.

19. The method of claim 16, wherein the removing step is performed by a plurality of associated notch filters.

20. The method of claim 16, wherein the signals are uplink or downlink RF signals in a cellular communication system.