Since the project is based on software defined radio sdr, the goal of this thesis is to transmit and receive a data via usrp connected on the pc. In this paper, we present an implementation of a long term evolution lte system on a software defined radio sdr platform using a conventional personal computer that adopts a graphic processing unit gpu and a universal software radio peripheral2 usrp2 with a ursp hardware driver uhd to implement an sdr software modem and a radio frequency transceiver, respectively. Over in china where td lte is commonly used, jiao xianjun discovered that the current lte cellscanner linux program did not support td lte, so he made a fork which does support td lte. Software defined radio with zynq using simulink learn the modelbased design workflow from simulation of rf chain, testing with radio io to moving design to chip get handson experience with picozed setting up and communicating with board capture overtheair signal and process in matlab ad9361 configuration. In sc fdma, the transmitter adds an msize fft stage before the ofdm transmitter. This is useful for lte since it makes possible to exploit frequency dependence scheduling.
A realtime software defined radio platform fo r lteadvanced heterogeneous networks peng li 1, 2, yunjian jia, mingjun feng 1, changrong ye, fei chen, and huifang fan. Jul 27, 2016 ofdm for lte tdd subframe structure type 1 first ofdm symbol within a slot is little bit longer than other ofdm symbols. From the editors of the highly successful wcdma for umts, this new book gives a complete and uptodate overview of long term evolution lte in a systematic and clear manner. The long term evolution lte is an advanced standard for wireless voice and data communication.
The mstage fft stage takes a single carrier channel and converts it into subcarrier level symbols that can be transmitted over an nstage ofdm system here m the ul and dl. Implementation of lte scfdma on the usrp2 software defined radio platform in proceedings of 2011 ieee swedish communication technologies workshop okt. Implementing the scfdma transmission technique using. With scfdma, each user is assigned part of the system bandwidth scfdma has a significantly lower papr, providing the advantages of multicarrier technology without excessive cost for the mobile terminal transmitter, while retaining a reasonable degree of commonality between uplink and downlink technologies. Dreamcatcher essentials of lte and lte advanced courseware. Design and implementation of a constant envelope ofdm waveform in a software defined radio platform amos vershima ajo jr. Lte long term evolution or the eutran evolved universal terrestrial access network, introduced in 3gpp r8, is the access part of the evolved packet system eps. Umts lte single carrier frequency division multiple access sc fdma. I am trying to understand how sc fdma is used in lte system. The figure below shows the relationship between ofdm and sc fdma in lte.
Scfdma in lte system signal processing stack exchange. Implementation of lte scfdma on the usrp2 software. Resource blocks comprise 12 subcarriers, regardless of the overall lte signal bandwidth. For user simplicity, it has graphical user interface gui known as gnu radio companion grc, to build a signal processing ow graph. Software defined radio sdr enables various wireless. Lte is based on orthogonal frequency division multiplexing ofdm with cyclic prefix cp in the downlink, and on singlecarrier frequency division multiple access sc fdma with cyclic prefix in the uplink. Jan 12, 2011 single carrier frequency division multiple access sc fdma has been adopted by the third generation partnership project 3gpp for uplink transmission in technology standardized for long term evolution lte of cellular systems. Refer papr article to understand peak to average power ratio. This paper gives an overview of simulation of software defined radio forlong term evolution lte uplink based on orthogonal frequency division multiplexing. Figure mentions modules unique to the scfdma and in common with ofdma system. In scfdma, papr is same as that of original qpsk data symbols as m qpsk data symbols are transmitted in series at m times rate compare to ofdma. Sc fdma single carrierfrequency division multiple access.
The basics of air interface modulation choices are introduced and. Implementation of lte system on an sdr platform using cuda and. Tie index terms extends programmability through the rf with analog wireless, physical layer, lte, baseband processing, software defined radio. The flexibility, affordability, and easeofuse make the usrp an ideal option for numerous applications ranging from simple recordandplayback devices, to spectrum monitoring systems. A reconfigurable hardware platform implementation for. Implementation of lte scfdma on the usrp2 software defined.
It is one of two variants of lte technology, with the other being fd lte frequency division lte. Instead the reader is referred to wellknown literature references. This high par is one of the most important implementation challenges that face ofdm, because it reduces the efficiency and hence increases the cost of the rf power amplifier, which is one of the most expensive components in the radio. Implementation of a lte inspired transceiver on a usrp.
Implementation of ofdm systems using gnu radio and usrp. Scfdma in contrast first runs an fft over the groups of input bits to spread them over all subcarriers and then uses the result for the idft which creates. College of communication engineering, chongqing university, chongqing, 400044, china. Software radio is the technique of getting code as close to the antenna as possible. A new bandwidth allocation scheme for dualhop transmission using virtual oligopoly market model and cournot competition nikfar b. Digital information and communication technology and its applications, konya, turkey 2016, pp. Pdf lte for umts ofdma and scfdma based radio access. Abstract lowcost software communications architecture sca based waveform implementation and porting is a much soughtafter feature in the software defined radio sdr community. This evolution is a great boom in the mobile technologies towards 4th generation. Obeid4, yehea ismail5, and hassan mostafa1,5 1electronics and communications engineering department, cairo university. Software defined radio sdr is a radio in which all or majority of the functionality.
Therefore, the result of the idft is a frequencyshifted singlecarrier signal. The lte specification specifies sc fdma as the encoding scheme for the reverse link mobile to base station when the forward link uses ofdma. Scfdma is the air interface which has been selected for the uplink in the latest long term evolution lte standard. Written by experts actively involved in the 3gpp standards and product development, lte for umts, second edition gives a complete and uptodate overview of long term evolution lte in a systematic and clear manner. Performance analysis of lte system using ofdma and scfdma. This new form of radio implementation came to be known as software defined radio sdr or software radio. Software defined radio sdr is a promising technique for multitype, high speed wireless communication system with low requirements on capability of hardware. Typical values for each system bw is as follows system bw number of rbs n ifft binsifft 1. Why does the lte specification define scfdma as the. The main requirements for the new access network are high spectral efficiency, high peak data rates, short round trip time as well as flexibility in frequency and bandwidth. The me1 serves as a readytoteach package for indepth understanding and handson experience on lte and lte advanced technologies. Lte transmitter using zynqbased softwaredefined radio. Software implementation and performance analysis of the.
Opportunistic communications using software defined radio. Access scfdma waveform, according to the lte standard. The voice solution and voice capacity in lte are also illustrated. Implementation of lte sc fdma on the usrp2 software defined radio platform in proceedings of 2011 ieee swedish communication technologies workshop okt. The purpose of this thesis is to implement the basic features of wimax ofdm physical layer based on ieee 802. Scfdma single carrier frequency divison multiple access. The goal of sdrs is to implement fully functional radios in one system that previously needed multiple systems. Scfdma single carrierfrequency division multiple access. Design and implementation of a constant envelope ofdm.
Gnu radio is a software defined radio sdr platform. Introduction to sc fdma and uplink frame structure. Long term evolution is the outcome of the development of 3. Softwaredefined lte evolution testbed enabling rapid. Siso single input single output soft input soft output. This motivated us to build a prototyping platform using the ns3 lte lena stack and interface it with a realistic subset of the physical layer using labview, so that researchers can focus on the performance of algorithmic aspects rather than the implementation details of the algorithm within the lte standard in a realistic testbed. Lte for umts ofdma and sc fdma based radio access april 2009. Implementation of lte scfdma on the usrp2 software defined radio platform proc. Implementation of modulation schemes using software. Developed by a team led by matt ettus, the usrp product family is intended to be a comparatively inexpensive hardware platform for software radio, and is commonly used by research labs, universities, and hobbyists. The included classes qam, doublyselectivechannel, ofdm, fbmc. Software defined radio sdr is a promising technique for multitype, high speed wireless communication system with low requirements on capability of hardware devices, low. The ettus research usrp universal software radio peripheral platform is a lowcost sdr that is commonly used for rapid prototyping and complex system design.
When the system has n orthogonal rbs and k issue 2 xu quansheng, et al. Using software designed radio to transmit lte downlink signals at 2. Studies in softwaredefined radio system implementation. Mobility aspects and radio resource management together with radio and endtoend performance are assessed. Scfdma was introduced in the uplink, which is trying to combine the advantages. Figure2 depicts the block diagram of scfdma and ofdma system. Jun, 2015 uplink downlink user 1 user 2 user 3 scfdma ofdma figure 1.
Resource allocation algorithm in lte uplink scfdma system for timevaryinga 9 users nk, there are totally 1 1 1 cc. Implementation of lte system on an sdr platform using cuda and uhd. Wimax implementation on gnu radio platform information. The adroit project implemented the phy layer of the ieee 802. Sc fdma is the air interface which has been selected for the uplink in the latest long term evolution lte standard. The most important lte radio interface parameters are summarized in table 1 for the convenience of the reader. Software defined radio long term evolution lte is a upcoming telecommunication standard with throughput of up to 300 mbps. Softwaredefined radio sdr is a popular concept for. Implementation of dynamic resource allocation for lte system.
The papr issue led the lte designers to choose sc fdma in the uplink direction. This is what software defined radio sdr is all about. Implementation of dynamic resource allocation for lte system using gnu radio by hanke cheng a thesis submitted to the graduate faculty of george mason university in partial fulfillment of the requirements for the degree of master of science electrical and computer engineering commlittee. Grc translates any speci c task ow graph to a python program which calls in. The software toolkit that has been used for the implementation of the prototype has been gnu radio. Ofdm takes groups of input bits 0s and 1s to assemble the subcarriers which are then processed by the idft to get a time signal. Socalled software defined radios make it easier for tinkerers and researchers to prototype their own components for a 4g lte technology cellular network. Umts lte single carrier frequency division multiplexing sc. It starts with an indepth explanation of the background and standardization process before moving on to examine the system architecture evolution sae.
In this paper we discuss the implementation of a single carrier frequency division multiple access sc fdma transceiver running over the universal software radio peripheral 2 usrp2. Implementation of lte system on an sdr platform using cuda. This means that different lte signal bandwidths will have different numbers of resource blocks. Td lte is a mobile phone standard acronym for time division long term evolution. Fpga and firmware images for the usrp2 to operate as a wireless firewall wifire firewall wireless xilinxfpga software defined radio wirelesssensornetworks wirelesssensornetwork usrp updated jun 22, 2017.
Figure 2 from implementation of lte scfdma on the usrp2. Lte receiver using zynqbased softwaredefined radio sdr. Uplink downlink user 1 user 2 user 3 scfdma ofdma figure 1. Peter bjorn jorgensen phd fellow technical university of. New potential avenues for lte lte advanced lte a are public safety and missioncritical. Introduction econfigurable radio systems are radios that can change to different communication protocols as they. A type 1 lte radio frame with normal cyclic prefix. A reconfigurable hardware platform implementation for software defined radio using dynamic partial reconfiguration on xilinx zynq fpga ahmed kamaleldin1, sherif hosny2, khaled mohamed3, mostafa gamal1, abdelrhman hussien1, eslam elnader1, ahmed shalash1, abdelfattah m. In sc fdma, papr is same as that of original qpsk data symbols as m qpsk data symbols are transmitted in series at m times rate compare to ofdma. Implementation of dynamic resource allocation for lte.
Sdrwinncomm 20 proceedings wireless innovation forum. Section 3 also includes the parallelization of signal processing algorithms required for implementing lte. It not only reduces the acquisition cost to purchase systems and equipment, but also lowers the entry barrier, thus enabling a broader range of organizations to. Software defined radios 6 developed for multiple systems tribble, 2008. Nov 19, 20 in this paper, we present an implementation of a long term evolution lte system on a software defined radio sdr platform using a conventional personal computer that adopts a graphic processing unit gpu and a universal software radio peripheral2 usrp2 with a ursp hardware driver uhd to implement an sdr software modem and a radio frequency transceiver, respectively. Software defined radio with gnu radio and usrp2 8 2. Resource allocation algorithm in lte uplink scfdma system. Hassan modern academy cairo, egypt ain shams university a. Peak to average power ratio papr comparison with sc fdma and ofdma.
The dft makes sc fdma a singlecarrier signal because the input to the idft is a spectrum already not qam symbols. A realtime software defined radio platform for lte. In this paper, we present an implementation of a long term evolution lte system on a software defined radio sdr platform using a conventional personal computer that adopts a graphic processing. Figure mentions modules unique to the sc fdma and in common with ofdma system. Lte is based on orthogonal frequency division multiplexing ofdm with cyclic prefix cp in the downlink, and on singlecarrier frequency division multiple access scfdma with cyclic prefix in the uplink. Sc fdma was chosen because it combines the low papr techniques of singlecarrier transmission systems, such as gsm and cdma, with the multipath resistance and. Sdr platform and basics starting with a significant citation from gnu radio founder eric blossom, software defined radio can be defined as. Gomah national institute for standards giza, egypt abstract long term evolution lte is an advanced standard of the mobile communication systems. Dec 02, 2011 abstract lowcost software communications architecture sca based waveform implementation and porting is a much soughtafter feature in the software defined radio sdr community. It is considered a development for the 2g and 3g standards. An introduction to scfdma used by lte in uplink direction. Implementation of a wireless ofdm system using usrp 2 and. In this paper we discuss the implementation of a single carrier frequency division multiple access scfdma transceiver running over the universal software radio peripheral 2 usrp2. Software defined radio implementation of lte transmitter physical layer sara m.
Implementation of lte scfdma on the usrp2 software defined radio platform. In order to test our hypotheses, we have acquired two bladerf sdr platforms. For the experiments reported here, we adopted the usrp. Figure2 depicts the block diagram of sc fdma and ofdma system. Thesis submitted to the faculty of the virginia polytechnic institute and state university in partial fulfillment of the requirements for the degree of master of science in electrical engineering carl b.
G, implementation of lte scfdma on the usrp2 software defined radio. Id like to point out, that the whole purpose of sc fdma is to reduce the papr. It turns radio hardware problems into software problems. Software defined radio implementation of lte transmitter. Performance evaluation of lte physical layer using scfdma. With the software defined radio sdr concept a new communication technology was created to improve interoperability among different wireless networks, systems, and devices and some of the typical limitations in flexibility of classical radio implementations were removed, aiming at the same time at reducing the cost of technology components. Simulation of ofdm based software defined radio for fdd. Finally, the main differences between lte tdd and fdd modes are examined and hspa evolution in 3gpp releases 7 and 8 is described. Due to this it has been chosen as reference point, for analysing the possibilities of hardware accelerating the functionalities of the physical layer in a high. Single carrier frequency division multiple access is a process that allows mobile radios to share radio frequency allocation by dividing up that allocation into separate radio channels where each radio device can communicate on a single radio channel. In this paper, we present an implementation of a long term evolution lte system on a software defined radio sdr platform using a conventional personal computer that adopts a graphic processing unit gpu and a universal software radio peripheral2 usrp2 with a ursp hardware driver uhd to implement an sdr software modem and a radio. Implementation of lte scfdma on the usrp2 software defined radio platform by peter bjorn jorgensen, thomas lundgaard hansen, troels bundgaard sorensen and gilberto berardinelli no static citation data no static citation data cite. An allphotonic digital radio over fiber architecture abdollahi s.
Universal software radio peripheral usrp is a range of software defined radios designed and sold by ettus research and its parent company, national instruments. In this paper an improvement of a sc fdma system is aimed by decreasing the papr. Developed by a team led by matt ettus, the usrp product family is intended to be a comparatively inexpensive hardware platform for software radio, and is commonly used by research labs, universities, and hobbyists 5. Implementation of an asip based sdr platform for mimo ofdm transceivers. Radio will be used as the software part to implement the logic, and bladerf as the hardware to test. The primary contribution of this thesis is a highly tunable softwaredefined radio sdr implementation of the waveform which enables rapidprototyping and testing of ceofdm systems. Usrp is a range of software defined radios designed and sold by ettus research and its parent company, national instruments. Software defined radio sdr provides the platform through mat labsimulink tool and this is possible by the ieeep1900.
Kucuk, design and implementation of a realtime erpofdm sdr receiver on the usrp2 platform, proc. For instance, it would be possible to exploit the fact that user 1 might have a better radio link quality on some specific bandwidth area of the available bandwidth. As communications technology continues its rapid transition from analogue to digital, more functions of modern radio systems are implemented in software, rather than hardware, leading toward the software defined radio architecture. It platform, high computing performance and good energy ef. Implementing the scfdma transmission technique using the. The digital baseband processing of the waveform is executed on a general purpose processor gpp in the ubuntu 14. Every description i found so far refers to dft and idft. In this paper we discuss the implementation of a single carrier. The main advantages of the lte, also known as 4g, over the 2g and 3g systems are utilizing a higher peak data rates in both. Developing and prototyping nextgeneration communications systems. If you have a second sdr platform the transmitted signal can be captured and the broadcast channel decoded using the companion example lte receiver using zynqbased softwaredefined radio sdr. The pcbased implementation of the lte s enodeb and epc is a powerful platform for students to explore lte protocols and learn how to build a standalone lte network. Softwaredefined radio will let communities build their. Especially, sc fdma is not necessary to implement fdma.
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