Evolutionary algorithms for orthogonal frequency division multiplexing-based dynamic spectrum access systems

2012 ◽  
Vol 56 (14) ◽  
pp. 3206-3218 ◽  
Author(s):  
H. Ahmadi ◽  
Y.H. Chew
Keyword(s):  
Evolutionary Algorithms ◽  
Orthogonal Frequency Division Multiplexing ◽  
Dynamic Spectrum Access ◽  
Dynamic Spectrum ◽  
Frequency Division Multiplexing ◽  
Frequency Division ◽  
Spectrum Access

scholarly journals FILTER BANK MULTICARRIER (FBMC) UNTUK 5G

2021 ◽  
Vol 13 (2) ◽  
pp. 135-142
Author(s):  
Gradiyanto Jason ◽  
Theresia Ghozali ◽  
Kumala Indriati
Keyword(s):  
Amplitude Modulation ◽  
Orthogonal Frequency Division Multiplexing ◽  
Dynamic Spectrum Access ◽  
Filter Bank ◽  
Quadrature Amplitude Modulation ◽  
Cyclic Prefix ◽  
Intercarrier Interference ◽  
Frequency Division ◽  
Spectrum Access ◽  
Filter Bank Multicarrier

Saat ini, teknologi pada bidang telekomunikasi berkembang dengan pesat. Pengguna telekomunikasi membutuhkan teknologi komunikasi yang cepat dengan bandwidth yang lebih lebar. Oleh karena itu dikembangkanlah Filter Bank Multi Carrier/Offset Quadrature Amplitude Modulation yang merupakan teknologi kandidat modulasi yang akan digunakan pada 5G. Filter Bank Multi Carrier/Offset Quadrature Amplitude Modulation (FMBC/OQAM) merupakan perkembangan dari Orthogonal Frequency Division Multiplexing (OFDM) yang dimodifikasi dengan menggunakan filter untuk mengurangi noise. OFDM menggunakan teknik multiplexing yang membagi bandwith menjadi beberapa frekuensi sub-carrier. Tetapi OFDM memiliki kelemahan yaitu memerlukan Cyclic Prefix (CP) untuk mengatasi Intersymbol Interference (ISI) serta Intercarrier Interference (ICI). Dengan menggunakan Filter berdasarkan Lembaga Physical layer for dynamic spectrum access and cognitive radio (PHYDYAS)  ,lebar bandwith yang bertambah akibat Cyclic prefix  akan dapat dikurangi Hasil yang dicapai dalam penelitian ini adalah  FBMC berhasil diterapkan  dan data yang dikirim sama dengan data yang diterima.

scholarly journals Architecture and Implementation of Fading Compensation for Dynamic Spectrum Access Wireless Communication Systems

VLSI Design ◽  
2013 ◽  
Vol 2013 ◽  
pp. 1-9
Author(s):  
Masahide Hatanaka ◽  
Toru Homemoto ◽  
Takao Onoye
Keyword(s):  
Wireless Communication ◽  
Communication Systems ◽  
Orthogonal Frequency Division Multiplexing ◽  
Dynamic Spectrum Access ◽  
Dynamic Spectrum ◽  
Wireless Communication Systems ◽  
Clock Frequency ◽  
Spectrum Access ◽  
Ofdm Symbol ◽  
Piecewise Linear Interpolation

This paper proposes an efficient architecture and implementation of fading compensation dedicated to dynamic spectrum access (DSA) wireless communication. Since pilot subcarrier arrangements are adaptively determined in wireless communication systems with DSA, the proposed architecture employs piecewise linear interpolation to the channel response estimation for data subcarriers in order to increase the channel estimation accuracy. The fading compensation for an orthogonal frequency-division multiplexing (OFDM) symbol is performed within the time for one OFDM symbol to make increase of latency smaller. The proposed architecture guarantees real-time processing with 76 MHz or higher clock frequency. The FPGA implementation of the proposed architecture occupies 1,577 slices and works up to 121 MHz.

scholarly journals Suppression of Mutual Interference in Noncontiguous Orthogonal Frequency Division Multiplexing Based Cognitive Radio Systems

2017 ◽  
Vol 2017 ◽  
pp. 1-9 ◽  
Author(s):  
Atif Elahi ◽  
Ijaz Mansoor Qureshi ◽  
Fawad Zaman ◽  
Noor Gul ◽  
Tahir Saleem
Keyword(s):  
Cognitive Radio ◽  
Orthogonal Frequency Division Multiplexing ◽  
Spectrum Sharing ◽  
Dynamic Spectrum Access ◽  
Frequency Division Multiplexing ◽  
Frequency Division ◽  
Secondary Users ◽  
Generalized Sidelobe Canceller ◽  
Suppression Technique ◽  
Sidelobe Canceller

Orthogonal frequency division multiplexing (OFDM) is a favourable technology for dynamic spectrum access (DSA) due to the flexibility in spectrum shaping. In spite of that, high sidelobes of OFDM subcarriers bring in considerable interference to the nearby users, particularly in OFDM based cognitive radio (CR) networks, where the secondary users (SUs) are capable of accessing the spectrum opportunistically. In this paper, two new techniques for the suppression of high sidelobes are proposed. The proposed techniques composed of an optimization scheme are followed by generalized sidelobe canceller. The proposed techniques can be considered as a two-level suppression technique in the sense that in the first level the sidelobe is reduced by using cancellation carriers (CCs), whose amplitudes are determined using genetic algorithm (GA) and differential evolution (DE), while in the second level further reduction of sidelobe is achieved using generalized sidelobe canceller (GSC). Simulation results show the power spectral density (PSD) performance of the proposed techniques in comparison with already existing techniques, demonstrating that the proposed techniques minimize the out-of-band radiation (OOBR) significantly, thus qualifying for more effective spectrum sharing.

Dynamic Spectrum Access to the Combined Resource of Commercial and Public Safety Bands Based on a WCDMA Shared Network

2009 ◽  
Vol E92-B (12) ◽  
pp. 3581-3585
Author(s):  
Hyoungsuk JEON ◽  
Sooyeol IM ◽  
Youmin KIM ◽  
Seunghee KIM ◽  
Jinup KIM ◽  
...  
Keyword(s):  
Public Safety ◽  
Dynamic Spectrum Access ◽  
Dynamic Spectrum ◽  
Spectrum Access ◽  
Shared Network
Sign in / Sign up

Export Citation Format

Share Document