Patent ID: 8169977

Claim:
A method of operating a sectorized base station including a first sector and a second sector in a frequency division multiplexing (FDM) communication system using a set of available tones, the method comprising: determining a first set of tones in a first set of FDM symbols; transmitting to the first sector a set of known symbols in the first set of tones in a first FDM symbol in the first set of FDM symbols at a predetermined power; determining a second set of tones in a second set of FDM symbols, wherein the second set of FDM symbols are a subset of the first set of FDM symbols; restraining from transmitting any power to the first sector in the second set of tones in a second FDM symbol in the second set of FDM symbols; determining a third set of tones in the first set of FDM symbols; transmitting to the second sector the set of known symbols in the third set of tones in a third FDM symbol in the first set of FDM symbols at a predetermined power; determining a fourth set of tones in a third set of FDM symbols; restraining from transmitting any power to the second sector in the fourth set of tones in a fourth FDM symbol in the third set of FDM symbols, wherein a plurality of modular tone spacings between adjacent pairs of modular adjacent tones are equal to one of a set (a), a set (b) or a set (c), wherein the plurality of modular tone spacings are calculated with a modular constant equal to 113, wherein: the set (a)={26, 27, 26, 5, 29}; the set (b)={26, 1, 26, 31, 29}; and the set (c)={2, 27, 26, 27, 31}.