Patent ID: 8576936

Claim:
A method of communicating wirelessly comprising: creating a plurality of sub-carrier data signals by quadrature amplitude modulating data onto a plurality of sub-carrier frequencies spaced apart by a sub-carrier frequency spacing interval; converting the plurality of sub-carrier data signals to the frequency domain to create a plurality of frequency bin signals; in the frequency domain, adding pilot symbols at equidistant time points within the plurality of sub-carrier data signals so that each pilot symbol pattern exclusively comprises during a given time period first pilot symbol information to be transmitted during a first time interval by using a first sub-carrier data signal with a first frequency dimension, second pilot symbol information to be transmitted during a second time interval succeeding the first time interval by using a second sub-carrier data signal that is immediately adjacent to the first sub-carrier data signal and that has a second frequency dimension lower than the first frequency dimension, and third pilot symbol information to be transmitted during a third time interval succeeding the first time interval by using a third sub-carrier data signal that is immediately adjacent to the first sub-carrier data signal and that has a third frequency dimension higher than the first frequency dimension, where the period between the first and second time intervals is the same as the period between the second and third time intervals; converting the weighted frequency bin signals back to the time domain; frequency shifting the sub-carrier data signals by one half of the sub-carrier frequency spacing interval; modulating the sub-carrier data signals onto a radio frequency carrier wave for wireless transmission; receiving the sub-carrier data signals wirelessly; frequency shifting the received sub-carrier data signals by one half of the sub-carrier frequency spacing interval in a direction opposite the direction in which the sub-carrier data signals were previously shifted; and determining a phase difference of the channel response of adjacent sub-carriers using in combination said pilot bits in said first and second sub-carrier; phase equalizing the received sub-carrier data signals based on said phase difference.