Patent ID: 7864873
Filing Date: 2011-01-04
Classification: H04L

Abstract:
1. A method for spectral side lobe suppression of a transmission signal comprising the steps of: (a) providing a communication system selected from a group of systems, the group consisting of a wireless or wired orthogonal frequency-division multiplexing (OFDM) communication system, an OFDM multicarrier communication system, and an OFDM-based multicarrier communication system; and (b) inserting certain subcarriers as cancellation subcarriers in a frequency range of the communication system, the cancellation subcarriers containing, instead of complex data symbols, complex weighting factors; wherein the complex weighting factors are determined for each OFDM symbol sequence separately so that in accordance with an optimization criterion spectral side lobes of the each OFDM symbol sequence of an OFDM transmission of the communication system are minimized; and wherein as the optimization criterion for determining the complex weighting factors, use is made of minimizing a squared error between the transmission signal and scaled weighted cancellation subcarriers in each domain of a first spectral side lobe outside of the communication bandwidth or in another side lobe domain.