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Low complexity transmission of wideband OFDM signals via inter-band carrier aggregation

Typical transceiver implementation proposals for inter-band carrier aggregation (CA) suggest use of parallel independent chains, one for each of the available component carriers (CCs), which is not a scalable approach when the number of CCs increases. Aiming towards efficient transceiver architectures for CA, this paper focuses on the digital-baseband processing part of the transceiver operations and investigates the potential of a filter-bank based architecture for transmission of a single wideband OFDM waveform over multiple, concurrently operating narrowband CCs. Appropriate filter bank designs and system operational parameters are pursued in order to keep the resulting transceiver complexity comparable to that of a standard single CC transmission. It is demonstrated that there exist designs which achieve this goal and, moreover, are able to inherently exploit the maximum available CC diversity by a simple precoding operation on the transmitted signal without any rate loss due to coding.