Patent ID: 7257151

Claim:
A circuit for a wireless receiver for use in a multi-band orthogonal frequency division multiplex (MB-OFDM) communication system to despread a hierarchical sequence made by spreading an M-length sequence with an N-length sequence, the circuit comprising: a first despreader coupled to a signal input, the first despreader to despread a received signal include a fixed frequency interleaved transmissions with a first sequence, wherein the signal is multi-band orthogonal frequency division modulation transmission including a preamble that makes use of the heirarchical sequence; and a second despreader coupled to an output of the first despreader, the second despreader to despread the output of the first despreader with a second sequence, wherein one of the first or second despreader has N multipliers and N- 1 delay elements and the other of the first or second despreader has M multipliers and M- 1 delay elements.