A solution to coexistence of OFDM and FH signals based on principles of cognitive radio implemented on USRP N210 platform

Moulines, Éric; Janjic, Milos

doi:10.1109/telfor.2014.7034404

Cited by 4 publications

(2 citation statements)

References 14 publications

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“…Extension of OFDM systems to OFDMA is also implemented using SDRs [59] with NI-USRP 210 model. In [60], the authors implemented OFDM-based secondary cognitive link by using USRP N210 platforms. In [61], OFDM is implemented by using GNU radio on USRP platform, mainly targeting WiMAX standard.…”

Section: Sdr Implementation Of Ofdm/ofdma-based Systemsmentioning

confidence: 99%

OFDMA-based network-coded cooperation: design and implementation using software-defined radio nodes

Gökçeli

Alakoca

Basaran

et al. 2016

EURASIP J. Adv. Signal Process.

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Benefits of network coding towards enhancing communication quality, both in terms of robustness or data transmission rates, make it a significant candidate as a future networking technology. Conventionally, network coding is mostly used in wired infrastructures, where transmission errors between nodes are negligible. Capturing the provided benefits of network coding via straightforward extension from wired networks to wireless networks is not trivial. In addition to the challenges introduced through the wireless channel impairments, we can also capture the spatial diversity gain provided by the broadcast nature of the wireless channels. In this work, we design and implement a network-coded cooperation (NCC) system that operates in real time through the use of software-defined radio (SDR) nodes for the first time in the literature. We specifically target wireless networks. Our system is based on orthogonal frequency division multiple access (OFDMA) that provides a practical means to enable high transmission rates through the use of narrowband subcarriers. The developed testbed is composed of three source nodes, a relay node and two destination nodes. The transmission of the proposed NCC-OFDMA system is completed in two phases; the broadcast and the relaying phases. Multiplexing of source nodes' signals is achieved through OFDMA technique. In the broadcast phase, an OFDMA signal is transmitted to relay and destination nodes. In the relaying phase, the relay node first detects the OFDMA signal, generates network-coded symbols, and then transmits these symbols to destination nodes. At the end of these two phases, the destination nodes determine the source nodes' signals by using network decoders. The destination nodes make use of both the uncoded and network-coded symbols, which are received in broadcast and relaying phases, respectively. Destination nodes then perform network decoding. Through real-time bit error rate and error vector magnitude measurements, we show that the NCC-OFDMA system can significantly improve the communication quality and robustness, while enabling data transmission between multiple users, as known from theoretical analyses. Some features of this implemented NCC-OFDMA system have the potential to be included in 5G standards, due to the improved radio resource usage efficiency.

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Section: Sdr Implementation Of Ofdm/ofdma-based Systemsmentioning

confidence: 99%

OFDMA-based network-coded cooperation: design and implementation using software-defined radio nodes

Gökçeli

Alakoca

Basaran

et al. 2016

EURASIP J. Adv. Signal Process.

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“…SDR olarak NI-USRP N210 modeli kullanılarak OFDM tabanlı sistem tasarımı çalışmaları yapılmıştır [5]. NI-USRP N210 platformunda OFDM sistemi ile gerçeklenmiş frekans atlama teknikleri ve bazı radar tarama sistemleri üzerine çalışmalar vardır [6], [7]. [8] OFDM'e göre dinamik ve çoklu kullanıcılara uygun bir yapının tasarımının zorluguyla açıklanabilir.…”

Section: Introductionunclassified

Design and implementation of a software defined radio based OFDMA network

Gökçeli

Alakoca

Kurt

2015

2015 23nd Signal Processing and Communications Applications Conference (SIU)

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Özetçe -OFDM teknigi; güncel haberleşme sistemlerinde kullanımı yaygın olan, frekans spektrumunun verimli kullanımı ile birlikte yüksek kalitede kullanıcı hizmeti saglayan bir tekniktir. OFDM tekniginin literatürde bir takım yazılım tabanlı radyo uygulamaları yapılmıştır. OFDM tekniginin getirdigi avantajların, çoklu kullanıcılı ve dinamik yapıdaki sistemler tarafından kullanılmasını saglayan OFDMA teknigi, modern haberleşme sistemleri için daha büyük önem taşımaktadır. Bu çalışmada OFDM'in gelişmiş türü olarak kabul edilen OFDMA sisteminin literatürde bir ilk olarak çoklu verici ortamında yukarı-baglantı OFDMA yazılım tabanlı radyo uygulaması yapılmıştır. Yapılan bu uygulama ile çoklu kullanıcılı sistemlerin getirdigi problemlerin çözülmesinin temelleri atılmıştır. Ayrıca bu uygulama ile güncel ve gelecekteki haberleşme teknolojilerinin temellerinin ve yapısının anlaşılmasının yolu açılmıştır.Anahtar Kelimeler-OFDMA, yazılım tabanlı radyo, çoklu kullanıcılı haberleşme, senkronizasyon.Abstract-OFDM technique has wide usage in modern communication systems, it can offer efficient use of frequency spectrum and high service quality for users. In literature, there are some software defined radio implementations of OFDM technique. OFDMA technique that can deliver advantages of OFDM technique to multi-user and dynamic based systems is more important for modern communications systems. In this study, for the first time in literature, multi-transmitter OFDMA, which is seen a generalized case of OFDM, is implemented using software defined radio technology. Handicaps of multiuser systems are tackled and solved with our implementation. This implementation is also an important step for understanding the basics and structure of modern and future communication technologies.

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