Multicarrier transmission method and apparatus
AssigneePanasonic Corporation
InventorsHiroshi Itahara, Yuichi Hagiwara
Life of this patent
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Abstract
A multicarrier transmission apparatus that achieves both power efficiency in a high-frequency amplifier and quality of transmission signal in a radio transmission system in next-generation mobile communications that supports high speed data packet transmission. In the apparatus, adaptive peak limiter 400 performs adaptive hard limit processing on baseband signals of frequency channels passed through multiplexing sections 200a to 200d for users, multicarrier signal generating circuit 500 with peak suppressing function performs peak limit processing on a synthesized multicarrier signal, hybrid distortion compensating circuit 700 corrects non-linear distortion due to high-frequency amplifier 32, and the multicarrier signal is transmitted from an antenna (ANT).
Claims6
An adaptive peak limiter comprising:
- a plurality of hard limiters which is provided respectively for a plurality of frequency channels having a possibility of containing communication data to which a predetermined data packet transmission scheme is applied, and limits an amplitude value of a baseband signal of each of the frequency channels using an adaptive limit value provided from outside;
- and a limit value table to which access is made using, as an address variable, on/off bit information indicative of whether the predetermined data packet transmission scheme is applied and another on/off bit information indicative of whether each of the frequency channel is used, both the information being reported from an upper layer for each of the frequency channels, and which outputs an adaptive limit value as a result of the access to provide to at least one of the plurality of hard limiters.
Dependencies are inferred from the claim text.