Methods and system for wireless networks with relays involving pseudo-random noise sequences

A relay station configured to communicate via an orthogonal frequency division multiplexed (OFDM) communication system, comprising:

• a memory;
• and
• a processor configured to:
• select one pseudo-random noise (PN) sequence from a plurality of PN sequences, wherein the one PN sequence is distinct from PN sequences assigned to other relay stations and base stations in a communication area of the relay station;
• store the distinct PN sequence for the relay station in the memory
• generate a preamble based on the distinct PN sequence for the relay station;
• and
• transmit a signal to a base station, the signal including the preamble.

A base station configured to communicate via an orthogonal frequency division multiplexed (OFDM) communication system, comprising:

• a memory;
• and
• a processor configured to:
• receive, from a relay station of the OFDM communication system, a list of a plurality of pseudo-random noise (PN) sequences for the relay station;
• select one of the PN sequences from the list;
• and
• assign the one of the PN sequences to the relay station, wherein the one of the PN sequences is distinct from PN sequences assigned to other relay stations and base stations in a communication area of the relay station.