Patent ID: 7944980
Filing Date: 2011-05-17
Classification: H04L

Abstract:
1. Apparatus for transmitting a transmit block pursuant to an OFDM scheme, said apparatus comprising: a combiner configured to multiply a data block with a first selected scrambling sequence to form a first combination sequence, the first selected scrambling sequence being from a set of scrambling sequences, wherein each scrambling sequence from the set of scrambling sequences comprises a sequence of binary values with different binary sequences forming independent sequences, each independent sequence consisting of a plurality of 1 and −1 values; a scrambling sequence provider configured to provide the first selected scrambling sequence to said combiner, said scrambling sequence provider and said combiner are configured iteratively to provide successive scrambling sequences and successive combination sequences if a power ratio indicium associated with either the first combination sequence or a subsequent combination sequence is larger than a predefined threshold; a provider configured to generate a control signal that identifies the selected scrambling sequence of the accepted combination sequence; and a transmitter adapted selectably to receive an accepted combination sequence formed by said combiner and the control signal generated by said provider, the combination sequence being accepted if a power ratio indicium based on the first combination sequence or subsequence combination sequence is determined to be smaller than the predefined threshold, the accepted combination sequence forming the transmit block, said transmitter configured to transmit the accepted combination sequence and the control signal.