Patent ID: 7724125

Claim:
A remote unit for a keyless entry system, the remote unit comprising: a controller configured to generate a command signal for transmission during a transmission period in response to a user input, the command signal comprising a first command message and a second command message, wherein the first command message comprises first and second high power, low data rate portions having data indicative of a function corresponding to the user input and the second command message comprises a low power, high data rate portion having data indicative of the function corresponding to the user input; wherein the first low data rate portion has a first transmission length within the transmission period, the second low data rate portion has a second transmission length within the transmission period, and the high data rate portion has a third transmission length within the transmission period; wherein the data rate portions are arranged in the command signal such that the first low data rate portion precedes the high data rate portion and the high data rate portion precedes the second low data rate portion; wherein the power and transmission lengths of the data rate portions are matched such that an average strength of the command signal is lower than a first threshold and such that a peak strength of the command signal is lower than the sum of the average strength of the command signal and a second threshold greater than the first threshold; and a transmitter configured to transmit the command signal.