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Analysis and rate optimization of GFDM‐based cognitive radios
Author(s) -
Mohammadian Amirhossein,
Baghani Mina,
Tellambura Chintha
Publication year - 2018
Publication title -
transactions on emerging telecommunications technologies
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.366
H-Index - 47
ISSN - 2161-3915
DOI - 10.1002/ett.3435
Subject(s) - cognitive radio , orthogonal frequency division multiplexing , transmitter , interference (communication) , computer science , electronic engineering , transmission (telecommunications) , spectral efficiency , convex optimization , frequency division multiplexing , multiplexing , optimization problem , transmitter power output , frequency allocation , telecommunications , computer network , wireless , engineering , mathematics , algorithm , regular polygon , beamforming , channel (broadcasting) , geometry
Abstract Generalized frequency division multiplexing (GFDM) is suitable for cognitive radio networks due to its low out‐of‐band emission and high spectral efficiency. In this paper, we thus consider the use of GFDM to allow an unlicensed secondary user (SU) to access a spectrum hole. However, in extremely congested spectrum scenarios, both active incumbent primary users on the left and right channels of the spectrum hole will experience out‐of‐band interference. While constraining this interference, we thus investigate the problem of power allocation to the SU transmitter to maximize the overall data rate where the SU receiver is employing a matched filter or zero‐forcing receiver. The power allocation problem is thus solved as a classic convex optimization problem. Finally, total transmission rate of GFDM is compared with that of orthogonal frequency division multiplexing. For instance, when right and left interference should be below 10 dBm, the capacity gain of GFDM over OFDM is 400%.