Concurrent dual-band transmitter architecture for spectrum aggregation system

Authors:
Toru Kitayabu;Yoshiaki Amano;Hiroyasu Ishikawa
Affiliations:
KDDI R&D Laboratories Inc., Fujimino City, Saitama Prefecture, Japan;KDDI R&D Laboratories Inc., Fujimino City, Saitama Prefecture, Japan;KDDI R&D Laboratories Inc., Fujimino City, Saitama Prefecture, Japan
Venue:
RWS'10 Proceedings of the 2010 IEEE conference on Radio and wireless symposium
Year:
2010

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Abstract

This paper proposes a new transmitter architecture that enables concurrent transmission of two separate frequency bands. This is required in order to realize a spectrum aggregation system. The architecture is based on a delta-sigma (ΔΣ) modulation which converts a non-constant envelope signal into a constant one. This enables the transmitter to employ a switching power amplifier that has high efficiency. To demonstrate the effectiveness of this architecture, the results of a simulation in which QPSK signals were concurrently transmitted in two bands are presented. In the simulation, the switching amplifier is modeled as an ideal linear amplifier.