Patent ID: 8265176
Filing Date: 2012-09-11
Classification: H04L

Abstract:
1. A method comprising: receiving a first orthogonal frequency division multiplexing signal via a transceiver; applying a first power mask to the first orthogonal frequency division multiplexing signal to generate a first carrier modified signal, wherein the applying of the first power mask includes adjusting (i) a shape of a first frequency spectrum of the first orthogonal frequency division multiplexing signal, and (ii) power levels of frequency carriers of the first orthogonal frequency division multiplexing signal; applying an inverse fast Fourier transform to the first carrier modified signal to generate a first time-domain signal; adjusting a duration of a first cyclic prefix based on a delay spread of a channel of the first orthogonal frequency division multiplexing signal; inserting the first cyclic prefix in the first time-domain signal; multiplying the first time-domain signal by at least one cosine window to generate a second time-domain signal; adjusting a first set of parameters of the first orthogonal frequency division multiplexing signal based on (i) a first regulation associated with a first country, and (ii) a first channel type to generate a first digital signal, wherein the first set of parameters includes (i) a first bandwidth, (ii) a first shape of a first spectrum, (iii) a first power level of the first spectrum, and (iv) a first position of the first spectrum, and wherein adjusting the first set of parameters comprises converting the first digital signal to a first analog signal (i) via a digital-to-analog converter, and (ii) based on a sampling frequency; receiving a second orthogonal frequency division multiplexing signal via the transceiver; adjusting a second set of parameters of the second orthogonal frequency division multiplexing signal based on (i) a second regulation associated with a second country, and (ii) a second channel type to generate a second digital signal, wherein the second country is different than the first country, and wherein the second set of parameters includes (i) a second bandwidth, (ii) a second shape of a second spectrum of the second orthogonal frequency division multiplexing signal, (iii) a second power level of the second spectrum, and (iv) a second position of the second spectrum; converting the second digital signal to a second analog signal via (i) the digital-to-analog converter, and (ii) based on the sampling frequency, wherein the second digital signal is converted to the second analog signal without altering the sampling frequency used to convert the first digital signal to the first analog signal; decreasing the first factor to increase the bandwidth for the first orthogonal frequency division multiplexing signal; and increasing the first factor to decrease the bandwidth for the first orthogonal frequency division multiplexing signal.