Patent ID: 7251291
Filing Date: 2007-07-31
Classification: H04L

Abstract:
1. A method of transmitting comprising: generating I/Q imbalance compensation pilot symbols located in time and frequency; generating a set of pilot symbols for channel estimation located in time and frequency; transmitting an orthogonal frequency division multiplexing (OFDM) signal containing the I/Q imbalance compensation pilot symbols and the pilot symbols for channel estimation; wherein the I/Q imbalance compensation pilot symbols are for use by a receiver to perform I/Q imbalance compensation to produce a corrected signal; and the pilot symbols for channel estimation are for use by the receiver to perform channel estimation based on the corrected signal; wherein the step of generating I/Q imbalance compensation pilot symbols comprises the steps of: wherein the first pilot carrier and the second pilot carrier are selected so that I/Q imbalance compensation is decoupled from channel estimation by said receiver receiving the first and second transmit signals; wherein the first predetermined sample frequency and the second predetermined sample frequency correspond to a predetermined positive frequency and a predetermined negative frequency, respectively; and the predetermined positive frequency and the predetermined negative frequency are symmetrical about a direct current (DC) frequency in the bandwidth of the communication channel.