Personal communication network unit for use in a spread spectrum communication system overlaying a microwave system

• US 6,243,370 B1
• Filed: 06/26/2000
• Issued: 06/05/2001
• Est. Priority Date: 05/15/1991
• Status: Expired due to Fees

• Current Assignee: Interdigital Technology Corporation (InterDigital, Inc.)
• Original Assignee: Interdigital Technology Corporation (InterDigital, Inc.)
• Inventors: Schilling, Donald L.
• Primary Examiner(s): CANGIALOSI, SALVATORE A
• Application Number:
  US09/602,718
• Time in Patent Office: 344 Days
• Field of Search: 370/320, 370/335, 370/342, 370/441, 370/321, 375/141, 343/387, 342/357
• US Class Current: 370/335
• CPC Class Codes: H04B 1/71 the interference being narrowband interference
• CPC Class Codes: H04W 52/343 taking into account loading or congestion level
• CPC Class Codes: H04W 52/346 distributing total power among users or channels

Abstract

A personal communication network unit used in a spread spectrum code division multiple access (CDMA) communication system. The CDMA communication system co-exists with a microwave system which selectively utilizes various microwave frequencies within a selected range of frequencies. The unit generates a spread spectrum CDMA data signal using a pseudo random chip code sequence. The spread data signal encompassing the selected range. The unit notch filters the spread data signal at microwave frequencies within the selected range used by the microwave system. The notch filtered spread data signal is transmitted to a base station.

Claims

1. A personal communications network unit for use in a spread spectrum code division multiple access (CDMA) communication system which co-exists with a microwave system, the microwave system selectively utilizing various microwave frequencies within a selected range of frequencies, the unit comprising:

means for generating a spread spectrum CDMA data signal using a pseudo random chip code sequences the spread data signal encompassing the selected range;

means for notch filtering the spread data signal at microwave frequencies within the selected range used by the microwave system; and

means for transmitting the notch filtered spread data signal to a base station.

2. The unit of claim 1 further comprising means for determining microwave frequencies currently used by the microwave system that have a spectrum overlapping a spectrum of the spread data signal;

wherein the notch filtering is at the determined microwave frequencies.

3. The unit of claim 2 further comprising means for detecting a microwave power associated with the overlapping frequencies;

wherein the determining of the overlapping microwave frequencies is based on in part the detected microwave power.

4. The unit of claim 2 wherein each of the overlapping frequencies has an associated bandwidth, the unit further comprising:

means for determining the bandwidth for each of the overlapping frequencies;

wherein the notch filtering filters a bandwidth at each of the overlapping frequencies based on in part that frequency'"'"'s determined bandwidth.

5. The unit of claim 2 wherein the unit further comprises:

means for receiving a command indicating the overlapping microwave frequencies transmitted from the base station;

wherein the determining of the overlapping frequencies is based on in part the received command.

6. The unit of claim 1 further comprising:

means for receiving a base spread spectrum CDMA data signal and recovering data from the base data signal;

wherein the base data signal being notched filtered at the microwave frequencies within the selected range.

7. The unit of claim 6 further comprising:

means for notch filtering the received base data signal at the microwave frequencies within the selected range prior to the recovering of data.

8. The unit of claim 7 further comprising means for determining microwave frequencies currently used by the microwave system that have a spectrum overlapping a spectrum of the spread data signal and received base CDMA data signal;

wherein the notch filtering of the spread data signal is at the overlapping frequencies and the notch filtering of the received base data signal is at the overlapping frequencies.

9. The unit of claim 8 further comprising means for detecting a microwave power associated with the overlapping frequencies wherein the determining of the overlapping microwave frequencies is based on in part the detected microwave power.

10. The unit of claim 8 wherein each of the overlapping frequencies has an associated bandwidth, the unit further comprising:

means for determining the bandwidth for each of the overlapping frequencies;

wherein the notch filtering of the spread data signal and the base data signal filters a bandwidth of each of the overlapping frequencies based on in part that frequency'"'"'s determined bandwidth.

11. The unit of claim 8 wherein the unit further comprises:

means for receiving a command indicating the overlapping microwave frequencies transmitted from the base station;

wherein the determining of the overlapping frequencies is based on in part the received command.

12. A personal communications network unit for use in a spread spectrum code division multiple access (CDMA) communication system which co-exists with a microwave system, the microwave frequencies within a selected range of frequencies, the unit comprising:

a mixer for mixing a data signal with a pseudo random chip code sequence to generate a spread spectrum CDMA data signal, the spread data signal encompassing the selected range of microwave frequencies;

an adaptive notch filter for notch filtering the spread data signal at microwave frequencies within the selected range used by the microwave system; and

an antenna for transmitting to a base station the notch filtered spread data signal.

13. The unit of claim 12 further comprising a sensor detecting a microwave power associated with the microwave frequencies that have a spectrum overlapping a spectrum of the spread data signal, the detected microwave power used to determine the overlapping microwave frequencies;

wherein the adaptive notch filtering is at the determined microwave frequencies.

14. The unit of claim 12 wherein the antenna receives a command transmitted from the base station indicating the overlapping microwave frequencies and the adaptive notch filtering is at the indicated overlapping microwave frequencies.

15. The unit of claim 12 further comprising a controller operatively coupled to the adjustable notch filter for controlling the adjustable notch filter to filter at the microwave frequencies used by the microwave system.

16. The unit of claim 12 further comprising a local oscillator for modulating the notch filtered spread data signal to radio frequency.

17. The unit of claim 12 wherein the antenna receives a base station spread spectrum CDMA data signal;

wherein the base data signal being notch filtered at the microwave frequencies within the selected range.

18. The unit of claim 17 further comprising:

a despreader for despreading the base data signal;

a bandpass filter for filtering the despread base data signal; and

a detector for detecting data within the despread base filtered data signal.

19. A personal communications network unit for use in a spread spectrum code division multiple access (CDMA) communication system which co-exists with a microwave system, the microwave system selectively utilizing various microwave frequencies within a selected range of frequencies, the unit comprising:

a modulator for converting a data signal into a format suitable for communicating over radio waves;

a spread-spectrum modulator for spreading the converted data signal using a pseudo random code sequence; and

a transmitter for transmitting the spread data signal over a spectrum encompassing the selected range of frequencies;

whereby at a base station data is recovered from the transmitted spread data signal by notch filtering at the microwave frequencies within the selected range.