講演抄録/キーワード |
講演名 |
2020-03-04 11:35
Improving In-Band Full-Duplex Capacity by Transmitter Nonlinearization using Digital Predistortion ○Chua Teong Zhe・Kazuki Komatsu・Yuichi Miyaji・Hideyuki Uehara(Toyohashi Univ. of Tech.) RCS2019-338 |
抄録 |
(和) |
In-band full-duplex (IBFD) is expected to have higher throughput or spectral efficiency compared to conventional wireless communication schemes. However, as IBFD uses the same frequency band to transmit and receive at the same time, the transmitted signal of a device is received as self-interference (SI) at the same device. In order to realize IBFD systems, SI must be cancelled sufficiently so that the desired signal from the communicating device can be demodulated correctly. In this technical report, we focus on SI cancellation in the digital domain and propose the introduction of transmitter nonlinearities using digital predistortion in order to improve the self-interference cancellation ratio of Hammerstein cancellers and consequently the full-duplex capacity of IBFD systems. Simulation results show that coupling a fifth order Hammerstein canceller with a nonlinearizing predistorter increases the self-interference cancellation ratio and the full-duplex capacity of the system when compared to the case of coupling with a linearizing predistorter or when there is no predistorter. We also show the potential to further increase full-duplex capacity by operating the transmitter at a lower backoff, but at the cost of increasing the nonlinear components of the transmitted signal. |
(英) |
In-band full-duplex (IBFD) is expected to have higher throughput or spectral efficiency compared to conventional wireless communication schemes. However, as IBFD uses the same frequency band to transmit and receive at the same time, the transmitted signal of a device is received as self-interference (SI) at the same device. In order to realize IBFD systems, SI must be cancelled sufficiently so that the desired signal from the communicating device can be demodulated correctly. In this technical report, we focus on SI cancellation in the digital domain and propose the introduction of transmitter nonlinearities using digital predistortion in order to improve the self-interference cancellation ratio of Hammerstein cancellers and consequently the full-duplex capacity of IBFD systems. Simulation results show that coupling a fifth order Hammerstein canceller with a nonlinearizing predistorter increases the self-interference cancellation ratio and the full-duplex capacity of the system when compared to the case of coupling with a linearizing predistorter or when there is no predistorter. We also show the potential to further increase full-duplex capacity by operating the transmitter at a lower backoff, but at the cost of increasing the nonlinear components of the transmitted signal. |
キーワード |
(和) |
In-band full-duplex / transmitter nonlinearities / digital predistortion / Hammerstein canceller / / / / |
(英) |
In-band full-duplex / transmitter nonlinearities / digital predistortion / Hammerstein canceller / / / / |
文献情報 |
信学技報, vol. 119, no. 448, RCS2019-338, pp. 99-104, 2020年3月. |
資料番号 |
RCS2019-338 |
発行日 |
2020-02-26 (RCS) |
ISSN |
Online edition: ISSN 2432-6380 |
著作権に ついて |
技術研究報告に掲載された論文の著作権は電子情報通信学会に帰属します.(許諾番号:10GA0019/12GB0052/13GB0056/17GB0034/18GB0034) |
PDFダウンロード |
RCS2019-338 |