Patent ID: 8942222
Filing Date: 2015-01-27
Classification: H04L

Abstract:
1. A method of wireless communication over a communication link that comprises a plurality of sub-carriers, comprising: providing, from a mobile unit to a base station, a pilot signal on a random access channel of the communication link, wherein the pilot signal comprises a sounding reference signal comprising at least one reference symbol; and modifying, at the mobile unit, at least one frequency of at least one uplink sub-carrier in response to a signal transmitted to the mobile unit by the base station, the signal indicating a modification of said at least one frequency, the modification being determined by the base station based on a value of a frequency of the pilot signal measured at the base station, wherein the modification of said at least one frequency is determined by down-modulating the received frequency at an expected subcarrier frequency and estimating a frequency offset between the expected subcarrier frequency and said at least one frequency using autocorrelation properties of the at least one reference symbol in an equivalent complex baseband representation of the down-modulated signal.