RSSI MEASUREMENT MECHANISM IN THE PRESENCE OF PULSED JAMMERS
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.
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.