RSSI MEASUREMENT MECHANISM IN THE PRESENCE OF PULSED JAMMERS

• US 20110134965A1
• Filed: 02/25/2011
• Published: 06/09/2011
• Est. Priority Date: 03/18/2008
• Status: Abandoned Application

• Current Assignee: On-Ramp Wireless Incorporated
• Original Assignee: On-Ramp Wireless Incorporated
• Inventors: Myers, Theodore J., Boesel, Robert W.
• Application Number:
  US13/035,459
• Publication Number:
  US 20110134965A1
• Time in Patent Office: Days
• US Class Current: 375/142
• CPC Class Codes: H03J 7/02 Automatic frequency control H03J7/18 takes precedence
• CPC Class Codes: H04B 1/7103 the interference being multiple access interference
• CPC Class Codes: H04J 13/00 Code division multiplex systems for frequency hopping H04B1/713
• CPC Class Codes: H04J 13/0029 Gold
• CPC Class Codes: H04J 3/0685 Clock or time synchronisation in a node; Intranode synchronisation
• CPC Class Codes: H04L 1/0038 Blind format detection for detection of modulation format H04L27/0012
• CPC Class Codes: H04L 1/0046 Code rate detection or code type detection H04L1/0038 takes precedence; detection of the data rate H04L25/0262; for packet format H04L1/0091
• CPC Class Codes: H04L 1/0057 Block codes H04L1/0061, H04L1/0064 take precedence
• CPC Class Codes: H04L 1/0061 Error detection codes
• CPC Class Codes: H04L 1/1819 with retransmission of additional or different redundancy
• CPC Class Codes: H04L 1/1867 Arrangements specially adapted for the transmitter end
• CPC Class Codes: H04L 2027/0065 Frequency error detectors H04L2027/0067 takes precedence
• CPC Class Codes: H04L 27/233 using non-coherent demodulation
• CPC Class Codes: H04L 7/0004 Initialisation of the receiver H04L7/0075 and H04L7/10 take precedence

Abstract

This disclosure relates to method, device and system for controlling power in a communication system. A plurality of power levels is measured from a received signal that includes a pulsed noise source. The received signal is correlated with a known sequence creating a correlation metric. A signal power is determined based on the correlation metric and the plurality of power levels. An uplink signal is transmitted at a transmit power that is based on the signal power.

Claims

1. A method of controlling power in a communication system, the method comprising:

measuring a plurality of sampled power levels from a received signal at a receiver, wherein the received signal comprises a pulsed noise signal;

correlating the received signal with a known sequence to determine a correlation metric;

determining a signal power excluding power of the pulsed noise signal, wherein the signal power is determined using the correlation metric and the plurality of sampled power levels; and

transmitting an uplink signal at a transmit power at a transmitter wherein the transmit power is based in part on the signal power excluding power of the pulsed noise signal.

2. The method of claim 1, wherein the correlation metric is determined in part by computing an average of a plurality of despread symbols, wherein a despread symbol of the plurality of despread symbols is computed in part from correlating the received signal with the known sequence.

3. The method of claim 2, wherein the plurality of despread symbols comprises sixteen despread symbols.

4. The method of claim 1, wherein the correlation metric is determined in part from an empirical mapping of the correlated received signal.

5. The method of claim 1, wherein the known sequence is a gold code.

6. The method of claim 1, wherein a first period of time where the plurality of sampled power levels is measured only partially overlaps with a second period of time where the received signal arrives at the receiver.

7. The method of claim 1, wherein the signal power excluding power of the pulsed noise signal is calculated as CM*[1/AVG(1/SQRT(P_i))]² where CM is the correlation metric and P_i is each of the plurality of sampled power levels.

8. The method of claim 1, wherein the received signal comprises a broadcast channel.

9. The method of claim 1, wherein the uplink signal is transmitted at a time based on a slot start time and a random timing offset, and further wherein the uplink signal is transmitted while at least a portion of a second signal is transmitted from a second node such that both the uplink signal and the second signal are received.

10. The method of claim 1, further comprising calculating a node interference based in part on the signal power, and transmitting the node interference to an access point.

11. A node comprising:

a processor;

a receiver operatively coupled to the processor and configured to measure a plurality of sampled power levels from a received signal, wherein the received signal comprises a pulsed noise signal;

correlate the received signal with a known sequence to determine a correlation metric, and

determine a signal power excluding power of the pulsed noise signal based on the correlation metric and the plurality of sampled power levels; and

a transmitter operatively coupled to the processor and configured to transmit a signal at a transmit power based in part on the signal power excluding power of the pulsed noise signal.

12. The node of claim 11, wherein the correlation metric is determined in part by computing an average of a plurality of despread symbols, wherein each despread symbol of the plurality of despread symbols is computed in part from correlating the received signal with the known sequence.

13. The node of claim 11, wherein the known sequence is a gold code.

14. The node of claim 11, wherein a first period of time where the plurality of sampled power levels is measured only partially overlaps with a second period of time where the received signal arrives at the receiver.

15. The node of claim 11, wherein the received signal comprises a broadcast channel.

16. A system comprising:

an access point comprising

a downlink transmitter configured to transmit a downlink signal; and

a node comprising

a processor;

a receiver operatively coupled to the processor and configured to measure a plurality of sampled power levels from a received signal, wherein the received signal comprises a pulsed noise signal,

correlate the received signal containing the downlink signal with a known sequence to determine a correlation metric, and

determine a signal power excluding power of the pulsed noise signal based on the correlation metric and the plurality of sampled power levels; and

a transmitter operatively coupled to the processor and configured to transmit a signal at a transmit power wherein the transmit power is based in part on the signal power excluding power of the pulsed noise signal.

17. The system of claim 16, wherein the correlation metric is determined in part by computing an average of a plurality of despread symbols, wherein each despread symbol of the plurality of despread symbols is computed in part from correlating the received signal with the known sequence.

18. The system of claim 16, wherein the known sequence is a gold code.

19. The system of claim 16, wherein a first period of time where the plurality of sampled power levels is measured only partially overlaps with a second period of time where the received signal arrives at the receiver.

20. The system of claim 16, wherein the received signal comprises a broadcast channel.