Method for spectral side lobe suppression in OFDM-based communication systems
AssigneeDeutsches Zentrum für Luft- und Raumfahrt e. V.
InventorsIvan Cosovic, Sinja Brandes, Michael Schnell
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Abstract
The subcarriers in an OFDM communication system or OFDM-based multicarrier communication system are multiplied with weighting factors, determined so that in accordance with an optimization criterion the side lobes are minimized in a determined frequency domain. In determining the weighting factors constraints can be taken into account to further boost system power output.
Claims27
A method for spectral side lobe suppression of the transmitter signal in wireless or wired orthogonal frequency-division multiplexing (OFDM) communication systems and in OFDM or OFDM-based multicarrier communication systems, characterized in that the subcarriers in the OFDM or OFDM-based multi-carrier communication system are multiplied with real or complex weighting factors determined so that in accordance with an optimization criterion the spectral side lobes are minimized.
The method as set forth in any of the preceding claims, characterized by use of a modulation method such as for example BPSK, QPSK or QAM compatible with OFDM communication systems or OFDM-based multi-carrier communication systems.
The method as set forth in any of the preceding claims, characterized in that the optimization criterion requires the square of the sum of the transmission signal to be minimized for a determined number of spectral side lobes.
The method as set forth in any of the preceding claims, characterized by weighting of the transmission signal in the frequency domain.
The method as set forth in any of the preceding claims, characterized in that a determined part of the subcarriers is left free, such as, for example, in the reverse link of OFDM.
The method as set forth in any of the preceding claims, characterized in that not all subcarriers are weighted, weighting instead being applied only to part of the subcarriers as determined.
The method as set forth in any of the preceding claims, characterized in that not only the subcarriers for data communication but also others as used, for example, for communicating pilot and/or sync symbols are weighted.
The method as set forth in any of the preceding claims, characterized by a combination of one or more methods for spectral side lobe suppression in the corresponding OFDM communication system or OFDM or OFDM-based multi-carrier communication system.
Use of the method as set forth in any of the preceding claims for an OFDM-based wired communication system for achieving spectral side lobe suppression.
Dependencies are inferred from the claim text.