Patent ID: 7860150

Claim:
A method comprising: composing, by a data processor, first uplink pilot signals and a second uplink pilot signal; transmitting, by at least one transmitter, the first uplink pilot signals during sub-bands and slots of a time-frequency resource space, wherein at least three first portions of the time-frequency resource space (a first long block 1 (LB 1 ), a first long block 2 (LB 2 ) and a first long block 3 (LB 3 )) are reserved for the first uplink pilot signals, wherein the first LB 1 and the first LB 2 comprise in-band pilot signals transmitted using a dedicated pilot code; and transmitting, by the at least one transmitter, the second uplink pilot signal during a second portion of the time-frequency resource space (a second long block 3 (LB 3 )) using a frequency hopping pattern and a pilot code allocation that are based on a slot and a sub-band in which the first LB 3 is transmitted.