New multiple-input multiple-output-based filter bank multicarrier structure for cognitive radio networks

• Published in: IET communications 2019-06, Vol.13 (10), p.1514-1523
• Main Authors: Abd El-Hamid, Zahraa, Hassan, Emad S, Zekry, Abdel-Halim A, Elagooz, Salah S, Samir, Moataz, Abd El-Samie, Fathi E
• Format: Article
• Language: English
• Subjects: bit error rate; channel bank filters; cognitive radio; cognitive radio networks; computational complexity; conventional FBMC‐based MIMO techniques; conventional OQAM‐FBMC systems; CR systems; CR‐based systems; DCT; discrete cosine transform; discrete cosine transforms; error statistics; even subcarriers; imaginary interference; intercarrier interference; interference suppression; inter‐carrier interference; MIMO communication; MIMO‐based FBMC transceiver structure; new multiple‐input multiple‐output‐based filter bank multicarrier structure; odd subcarriers; OFDM modulation; offset quadrature amplitude modulation‐based filter bank multicarrier modulation; OQAM‐FBMC techniques; orthogonal frequency division multiplexing; orthogonality conditions; QAM transmission; quadrature amplitude modulation; radio networks; radio transceivers; radiofrequency interference; Research Article; residual interference cancellation; resource allocation; resource allocation algorithm; spectral efficiency; spectral efficiency improvement; spectrum confinement; timing offset
• ISSN: 1751-8628; 1751-8636; 1751-8636
• DOI: 10.1049/iet-com.2018.5706

Cognitive radio (CR) has been proposed for spectral efficiency improvement while avoiding interference with licensed users. The offset quadrature amplitude modulation-based filter bank multicarrier (OQAM-FBMC) modulation is a promising candidate for CR-based systems. Although it behaves better in many aspects than orthogonal frequency division multiplexing (OFDM), the application of some techniques with FBMC becomes more challenging due to the imaginary interference, as in the case of multiple-input multiple-output (MIMO) technique. Here, the authors first propose a new MIMO-based FBMC transceiver structure for CR systems. The proposed structure is based on QAM transmission to handle the interference presented in conventional OQAM-FBMC systems. The authors also introduce two different methods to satisfy the orthogonality conditions and cancel the residual interference in QAM-FBMC systems. Both methods are based on discrete cosine transform (DCT) to achieve superior spectrum confinement and hence better spectral efficiency. Moreover, the authors present a resource allocation algorithm for the proposed structure. Simulation results demonstrate that the proposed structure outperforms the conventional FBMC-based MIMO techniques in terms of bit error rate (BER) and computational complexity. The results also show that the spectral efficiency of the proposed structure could be further improved by applying the proposed resource allocation algorithm.