Zobrazeno 1 - 10
of 14
pro vyhledávání: '"Phuong Huu Nguyen"'
Publikováno v:
Science and Technology Development Journal - Natural Sciences. 1:180-186
Cognitive radio (CR) systems are one of the most interesting topics in recent years. They would enable more efficient use of the spectrum. The main problem of CR is how to dectect exactly the spectrum usage of primary users. There are many ways to do
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::4c5e6736e66a47760ae1b055bd4bd800
https://doi.org/10.32508/stdjns.v1it4.495
https://doi.org/10.32508/stdjns.v1it4.495
Publikováno v:
Science and Technology Development Journal - Natural Sciences. 1:163-171
The technique named DC biased orthogonal frequency division multiplexing (DCO-OFDM) is the most popular method in optical wireless communication system. In this article, we describe for the first time an exact numerical computation for the bit error
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::b67426eef6bf9dbea4eddb6790769baa
https://doi.org/10.32508/stdjns.v1it4.475
https://doi.org/10.32508/stdjns.v1it4.475
Publikováno v:
Science and Technology Development Journal. 18:218-224
Optical wireless systems have attracted attention, because they allow high-speed transmission without electromagnetic interference. Orthogonal frequency division multiplexing (OFDM) can send multiple high speed signals by using orthogonal carrier fre
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::5f17759bf26c043657dd7898b1b15d7e
https://doi.org/10.32508/stdj.v18i3.839
https://doi.org/10.32508/stdj.v18i3.839
Publikováno v:
Science and Technology Development Journal. 17:17-31
In cognitive radio network, how to minimize the impact of secondary user on primary user’s signal plays a very important and complex role. Therefore, spectrum sensing is one of the most essential components of cognitive radio. Therefore, the effect
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::3fd8dd949b1399e5f1a08d72620e97dd
https://doi.org/10.32508/stdj.v17i1.1239
https://doi.org/10.32508/stdj.v17i1.1239
Publikováno v:
Science and Technology Development Journal. 17:5-16
Indoor optical wireless systems have attracted attention, because they allow high-speed transmission without electromagnetic interference. Multi Input Multi Output (MIMO) techniques are very promising in providing high data rate or providing performa
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::ed95d57b435df4a69085b354b67dd2f3
https://doi.org/10.32508/stdj.v17i1.1238
https://doi.org/10.32508/stdj.v17i1.1238
Publikováno v:
Science and Technology Development Journal. 14:34-42
Our ears often simultaneously receive various sound sources (speech, music, noise . . .), but we can still listen to the intended sound. A system of speech recognition must be able to achieve the same intelligent level. The problem is that we receive
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::fa0d564fd9499c73cc75fca3f915784b
https://doi.org/10.32508/stdj.v14i4.2034
https://doi.org/10.32508/stdj.v14i4.2034
Publikováno v:
Science and Technology Development Journal. 12:73-85
Recently, OFDM technique has been applied to many digital communications systems such as DVB-T, WiFi, WiMAX and MIMO systems. OFDM can send multiple high speed signals by using orthogonal carrier frequencies. In addition, OFDM technique can combat in
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::17333e77f8b726bd1c024b849ea19219
https://doi.org/10.32508/stdj.v12i12.2322
https://doi.org/10.32508/stdj.v12i12.2322
Publikováno v:
AETA 2013: Recent Advances in Electrical Engineering and Related Sciences ISBN: 9783642419676
Reception diversity has considered as an effective way to improve the system performance. In this paper, we present a real-time hardware implementation of spectrum sensing based energy detection (ED) with multi-receive antenna technique. We only focu
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::962883db5681b5c6c3e7b41c6dca2509
https://doi.org/10.1007/978-3-642-41968-3_19
https://doi.org/10.1007/978-3-642-41968-3_19
Publikováno v:
2013 International Conference on Advanced Technologies for Communications (ATC 2013).
Spectrum sensing (SS) plays a significant role in cognitive radio network. In our work, we focused on FPGA (Field Programmable Gate Array) implementation of SS applying for DVB-T (Digital Video Broadcasting - Terrestrial) signal detection because TV
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::31519644d40e10b124b4d83b7f82cc7a
https://doi.org/10.1109/atc.2013.6698098
https://doi.org/10.1109/atc.2013.6698098
Publikováno v:
2013 Annual International Conference on Emerging Research Areas and 2013 International Conference on Microelectronics, Communications and Renewable Energy.
In cognitive radio network (CR), spectrum sensing (SS) is regarded as a critical component. Several local SS schemes have been studied well in the literature to locate spectrum holes for reusing it. However, the system's performance will be degraded
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::f652998d9b2b0552ed16b7e80029c14a
https://doi.org/10.1109/aicera-icmicr.2013.6575928
https://doi.org/10.1109/aicera-icmicr.2013.6575928