Patent ID: 8223700

Claim:
A method for communication, the method comprising selecting a sequence from a group of sequences for random access; allocating at least one sub-carrier on an uplink channel for at least one random access channel (RACH), the uplink channel comprising at least one data channel, and each data channel comprising a continuous set of data sub-carriers; creating a guard band on each side of the at least one RACH by applying a raised cosine filter before transmitting the selected sequence using the RACH, wherein creating the guard band on each side of the at least one RACH further comprises: for each continuous set of multiple RACHs among the at least one RACH, applying the raised cosine filter to a first frequency bandwidth that corresponds to a combination of a first set of sub-carriers adjacent to a first side of the continuous set of multiple RACHs, the continuous set of multiple RACHs, and a second set of sub-carriers adjacent to a second side of the continuous set of multiple RACHs; mapping the selected sequence to the at least one RACH to generate a at least one RACH signal; and transmitting the at least one RACH signal to a base station.