Patent ID: 8619698

Claim:
A base station for use in a frequency division multiplexed communications system, the base station comprising: a transmitter that uses a set of N tones to communicate information into a first region, where N is larger than 10; a first control circuit, coupled to said transmitter, configured to control the transmitter to transmit over a first period of time using first signals into the first region, said first period of time being at least two seconds long; and a second control circuit, coupled to said transmitter, configured to control the transmitter to transmit during a second period of time a second signal including a set of X tones into said first region, where X is a positive integer less than 5, and where less than 80% of a maximum average total base station transmission power used by said base station transmitter to transmit into the first region during any 1 second period during said first period of time is allocated to said set of X tones and where each one of said X tones to which power is allocated is at least 20 times the per tone maximum average power allocated to tones during any one second time period in said first time period.