Granted Patent B2

US 9,209,858 · App. 13/084,901 · Granted Dec 8, 2015

Abstract

Claims (26)

1. A method of determining uplink noise power in a wireless communication system, comprising:

receiving signals from user equipment;

despreading the received signals by applying an unused channelization code;

determining the uplink noise power based on output of the despreading;

canceling noise power from a data signal power in the received signals based on the determined uplink noise power to produce a modified data signal power;

canceling noise power from a control signal power in the received signals based on the determined uplink noise power to produce a modified control signal power; and

detecting whether the user equipment is operating in a power limited mode based on the modified data signal power and the modified control signal power.

2. The method of claim 1 , further comprising:

selecting a channelization code from a set of orthogonal channelization codes such that the selected channelization code is currently unused.

3. The method of claim 1 , wherein the canceling cancels the determined uplink noise power from the power of the at least two signals on a symbol-by-symbol basis.

4. The method of claim 1 , further comprising:

performing detection of discontinuous transmission based on the determined uplink noise power.

5. The method of claim 1 , further comprising:

performing a signal processing operation based on the determined uplink noise power.

6. An uplink receiver, comprising:

a first despreader configured to receive signals from a user equipment, and configured to despread the received signals using an unused channelization code;

a second despreader configured to despread the received signals to obtain a data signal;

a third despreader configured to despread the received signals to obtain a control signal;

a noise cancellation unit configured to cancel noise power from data signal power and control signal power based on output from the first through third despreaders; and

a detector configured to detect whether the user equipment is operating in a power limited mode based on output of the noise cancellation unit.

7. The uplink receiver of claim 6 , further comprising:

an averaging unit configured to average output from the noise cancellation unit over a number of symbols.

8. The uplink receiver of claim 6 , further comprising:

a detector configured to detect discontinuous transmission based on the determined noise power.

9. The uplink receiver of claim 6 , further comprising:

an averaging unit configured to average output from the noise cancellation unit over a number of symbols.

Assignments (10)