An introduction to scfdma used by lte in uplink direction. Single carrier fdma places sc fdma in the wider context of wireless communications, providing the reader with an indepth tutorial on sc fdma technology. Summary of the difference between ofdm and sc fdma. Since sc fdma has low papr, it is sensitive to carrier frequency offsets cfos similar to that of ofdma. Broadband ofdmfdma system for the uplink of a wireless lan 4 properties of the ofdm transmission technique single carrier. Single carrier fdma for uplink wireless transmission 2006.
Single carrier frequency division multiple access sc fdma has recently become the preferred uplink transmission scheme in longterm evolution lte systems. Papr analysis of single carrier fdma system for uplink. Single carrier fdma sc fdma is a frequencydivision multiple access scheme. Uplink transmit power control for singlecarrier grouped fdma. Single carrier frequencydivision multiple access sc fdma, based on single carrier modulation with frequencydomain equalization scfde 1, is an uplink data transmission scheme for broadband. As wireless multimedia applications become more wide spread. The demand for wireless communication increased rapidly through. This technique is also known as dftspread ofdm dftsofdm where dft is an acronym for discrete fourier transform. Singlecarrier frequency division multiple access scfdma has been adopted and employed as the standard in the 3rd generation partnership project 3gpp longterm evolution lte uplink multipleaccess scheme. Goodmansingle carrier fdma for uplink wireless transmission.
Precoding of ofdma signal with discrete fourier transformation dft can convert it into single carrier frequency division multiple access signal scfdma. Although the performance gap is small, sc fdma s advantage of low papr makes it desirable for uplink wireless transmission in mobile communication systems, where transmitter power efficiency is of paramount importance. Cooperative diversity schemes for uplink singlecarrier fdma systems. Single carrier frequency division multiple access scfdma is a promising technique for high data rate uplink. Ofdm takes groups of input bits 0s and 1s to assemble the sub carriers which are then processed by the idft to get a time signal. Single carrier fdma for uplink wireless transmission ieee journals. Qos analysis of mimonoma for uplink transmission using.
Although the performance gap is small, scfdmas advantage of low papr makes it desirable for uplink wireless transmission in mobile communication systems, where transmitter power efficiency is. Frequency domain softconstraint multimodulus blind. Single carrier fdma for uplink wireless transmission hyung g. Single carrier frequency division multiple access scfdma is a novel method of radio transmission under consideration for deployment in future cellular systems. If we carried out the scheduling methods on each subcarrier block which are composed of sequence subcarriers, the restraining of. Effects of different modulation schemes in papr reduction. Symbol duration mainly depends on data rate symbol duration single carrier fdma for uplink wireless transmission abstract. Single carrier frequency division multiple access sc fdma has been adopted and employed as the standard in the 3rd generation partnership project 3gpp longterm evolution lte uplink multipleaccess scheme. Effects of different modulation schemes in papr reduction of. Broadband ofdm fdma system for the uplink of a wireless lan 4 properties of the ofdm transmission technique single carrier. Why isnt scfdma used for downlink transmission in lte. Most researches focus on maximizing the system throughput of sc fdma under changeable channel condition. Convergence constrained multiuser transmitterreceiver. While wimax uses ofdma orthogonal frequency division multiple access, the 3gpp 3rd generation partnership project standardization group has decided to use sc fdma single carrier frequency division multiple access instead.
Among the possible subcarrier mapping approaches, we find that localized. For uplink scheme an emerging technology of single carrier frequency division multiple access sc fdma is used for high data rates and has been hugged by 3gpp for it cutting edge cell framework, called longterm evolution lte. So conversion of multicarrier ofdm signal into single carrier can effectively reduce papr of the signals. The radio resource allocation is one of the most important issues to achieve effective wireless communication. Uplink transmission the uplink transmission scheme is based on single carrier fdma, more specifically dftsofdm. Detection of single carrier fdma mark geles, amir averbuch, ofer amrani and doron ezri abstract single carrier fdma sc fdma plays an important role in modern wireless communications as an alternative to ofdm since mainly it exhibits low peaktoaverage power ratio papr. Single carrier frequency division multiple access sc fdma has been adopted for fourth generation 4g mobile uplink transmission schemes because of its low peak to average power ratio papr as compared to that of orthogonal frequencydivision multiple access ofdma. Single carrier fdma for uplink wireless transmission abstract. Single carrier fdma places scfdma in the wider context of wireless communications, providing the reader with an indepth tutorial on scfdma technology. So conversion of multi carrier ofdm signal into single carrier can effectively reduce papr of the signals.
Sc fdma has similar throughput performance and essentially the same overall complexity as ofdma. Download citation single carrier fdma for uplink wireless transmission single carrier frequency division multiple access sc fdma, a modified form of. A principal advantage of sc fdma is the peaktoaverage power ratio parr, which is lower than that. In this article, we deduced the ofdma and sc fdma basic performance. Like other multiple access schemes tdma, fdma, cdma, ofdma, it deals with the assignment of multiple users to a shared communication resource. Singlecarrier frequency division multiple access scfdma is considered as a. A uplink radio resource allocation scheme for localized sc. The long term evolution advanced ltea uplink transmission is covered as the main topic in this report. Single carrier fdma sc fdma is an extension of scfde to accommodate multiuser access.
Performance analysis of downlink and uplink transmission. User scheduling for uplink scfdma with subcarrierblocking. Single carrier fdma for uplink wireless transmission ieee xplore. Sc fdma has similar throughput performance and essentially the same overall.
On the other hand, the lte standard for uplink transmission is based on single carrier fdma scfdma, the principal subject of this book. The major reason for papr in ofdm is its multicarrier structure. Performance assessment of papr in ofdm system using single. Fairness aware group proportional frequency domain resource. We aim to introduce scfdma to an audience of industry engineers and academic researchers. This project mainly focuses on the uplink transmission i. Ofdma orthogonal frequency division multiple access uplink. Sc fdma is mainly depends on the multicarrier nature of ofdm for high throughput. Single carrier frequency division multiple access sc fdma, a modified form of orthogonal fdma ofdma, is a promising technique for high data rate uplink communications in future cellular systems. Goodman, single carrier fdma for uplink wireless transmission, ieee veh.
On the other hand, the lte standard for uplink transmission is based on single carrier fdma sc fdma, the principal subject of this book. Besides the papr reduction schemes, the single carrier frequency division multiple access sc fdma scheme has been proposed for alleviating the papr problem in uplink transmission. It uses the standard ofdma transceiver blocks with different ordering. Single carrier fdma scfdma for uplink wireless transmission, ieee. Performance analysis of scfdma and ofdma in lte frame structure. This paper presents virtual clusters based proportional fairness and resource allocation scheme for localized single carrier frequency division multiple access lsc fdma. Single carrier fdma scfdma is an extension of scfde to accommodate multiuser access. The sc fdma is a adopted multiple access scheme for uplink transmission in the long term evolution. The book introduces the reader to this new multiple access technique that utilizes single carrier modulation along with orthogonal frequency multiplexing and frequency domain. The performance of sc fdma in relation to ofdma has been the subject of various studies. Scfdma has similar throughput performance and essentially the same overall. Single carrierfrequency division multiple access scfdma is an ofdma variant technology that is tailored for uplink transmission.
Broadband ofdmfdma system for the uplink of a wireless. Abstractfor the uplink of the eutra long term evolution lte system, single carrier frequencydivision multiple access sc fdma transmission has been selected. The earliest digital cellular systems, north american tdma and. I think this is a very good qualitative comparison between ofdma and scfdma. Singlecarrier frequencydivision multiple access scfdma, based on singlecarrier modulation with frequencydomain equalization scfde 1, is an uplink data transmission scheme for broadband. Single carrier frequency division multiple access sc fdma is an ofdma variant technology that is tailored for uplink transmission. Next generation wireless multiple access technology ofdma and. Introduction to single carrier fdma places scfdma in the wider context of wireless communications, providing the reader with an indepth tutorial on scfdma technology. Broadband singlecarrier transmission techniques sciencedirect. So, single carrier frequency serves multiples users see fig. In long term evolution lte network, single carrier frequency division multiple access scfdma is applied as the transmission technology for uplink traffic. Masterseries single carrier fdma for uplink wireless. Besides the papr reduction schemes, the single carrier frequency division multiple access scfdma scheme has been proposed for alleviating the papr problem in uplink transmission.
If we now will introduce m as the total number of cells in area of service, 2. Singlecarrier fdma scfdma is a frequencydivision multiple access scheme. Single carrier frequency division multiple access sc fdma is a novel method of radio transmission under consideration for deployment in future cellular systems. Previously, we proposed the scheduling methods so as to select a constant number of simultaneous multiaccess users for uplink scfdma. The present invention presents a scheme for multiplexing and resource mapping of uplink data and uplink signaling information, in order to satisfy the single sub carrier characteristic in the transmission of the uplink data and uplink signaling information in an sc fdma wireless communication system. Performance analysis of scfdma and ofdma in lte frame.
Abstract single carrier fdma has been recently considered as a promising uplink transmission scheme for next generation mobile communications due to. Single carrier fdma for uplink wireless transmission researchgate. Goodman, polytechnic university o ver the past fifteen years, the bit rates achieved in cellular and local area wireless communications systems have increased steadily. Performance assessment of papr in ofdm system using. Frequencydomain linear and decisionfeedback equalizers have been already given in the literature for an sc fdma transmission over a multiple input multiple. The performance of scfdma in relation to ofdma has been the subject of various studies. It offers comparable performance and complexity to orthogonal frequency multiple access scheme ofdma with a lower peak to average power ratio papr offering. However, peaktoaverage ratio gets increase because we assumed that we carried out the scheduling methods on each subcarrier. Uplink transmission the uplink transmission scheme is based on singlecarrier fdma, more specifically dftsofdm. Tdma shares a single carrier frequency with several users, where each user makes use of nonoverlapping time slot. Tx diversity, rx diversity, singleuser mimo up to 4x4, beamforming uplink.
In the long term evolution lte downlink link access scheme based on ofdma, at the same time, the uplink access scheme based on sc fdma. Precoding of ofdma signal with discrete fourier transformation dft can convert it into single carrier frequency division multiple access signal sc fdma. Low complexity cfo compensation scheme for scfdma uplink. Jul 27, 20 lte video tutorial part 2 single carrier this video explains the importance of scfdma single carrier fdma and uplink frame structure in lte. Oct 31, 2008 introduction to single carrier fdma places sc fdma in the wider context of wireless communications, providing the reader with an indepth tutorial on sc fdma technology. Lte video tutorial part 2 single carrier this video explains the importance of scfdma single carrier fdma and uplink frame structure in lte. The present invention presents a scheme for multiplexing and resource mapping of uplink data and uplink signaling information, in order to satisfy the single subcarrier characteristic in the transmission of the uplink data and uplink signaling information in an scfdma wireless communication system. Scfdma aka dftprecodedspread ofdma is the multiuser version of single carrier modulation with frequency domain equalization scfde. In section iii, iterative frequency domain equalizer is described. Most researches focus on maximizing the system throughput of scfdma under changeable channel condition. The scfdma is a adopted multiple access scheme for uplink transmission in the long term evolution.
Sc fdma has drawn great attention from the communications industry as an attractive alternative to orthogonal frequency division multiple. Sc fdma aka dftprecodedspread ofdma is the multiuser version of single carrier modulation with frequency domain equalization scfde. Convergence constrained power allocation ccpa for turbo equalizer is derived in section iv. We aim to introduce sc fdma to an audience of industry engineers and academic researchers. Single carrierfrequency division multiple access scfdma is an. Resource allocation with multicell processing, interference cancelation and backhaul rate constraint in single carrier fdma systems p. Universal terrestrial radio access network utran which is the foundation for. Lsc fdma has been selected as the uplink transmission scheme in 3gpp long term evolution lte due to its low peak to average power ratio papr over ofdma in general and. Next generation wireless multiple access technology ofdma. Introduction to single carrier fdma places sc fdma in the wider context of wireless communications, providing the reader with an indepth tutorial on sc fdma technology.
It offers comparable performance and complexity to orthogonal frequency multiple access scheme ofdma with a lower peak to average power ratio papr offering powerefficient. Us10348473b2 method and apparatus for transmitting. In long term evolution lte network, single carrier frequency division multiple access sc fdma is applied as the transmission technology for uplink traffic. Sc fdma single carrier frequency division multiple access modulation formats qpsk, 16qam, 64qam mimo technology downlink. Scfdma has drawn great attention from the communications industry as an attractive alternative to orthogonal frequency division multiple. Long term evolution lte is consents pliable spectrum distribution which renders enriched wireless data services to users at lower latency and multimegabit throughput. Thus, instead of detecting the bits on many different sub carriers, only a single detector is used on a single carrier. If they are equal, they simply cancel out and it becomes a conventional singlel user single carrier system with frequency domain equalization. Previously, we proposed the scheduling methods so as to select a constant number of simultaneous multiaccess users for uplink sc fdma.
Singlecarrier frequencydivision multiple access scfdma, based on. Broadband ofdmfdma system for the uplink of a wireless lan. In uplink direction, however, the two systems go different ways. Scfdma single carrier frequency division multiple access modulation formats qpsk, 16qam, 64qam mimo technology downlink. Single carrier frequency division multiple access sc fdma is a promising technique for high data rate uplink. Lte uses orthogonal frequency division multiple access ofdma and single carrier frequency division multiple access sc fdma for downlink and uplink transmission where ofdma has been acquired in lte for downlink transmission. Single carrier fdma for uplink wireless transmission. Tx diversity, rx diversity, single user mimo up to 4x4, beamforming uplink. 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. Request pdf on dec 1, 2015, shatrughna prasad yadav and others published papr analysis of single carrier fdma system for uplink wireless transmission find, read and cite all the research you. A multistage decisionfeedback receiver design for lte uplink. The book introduces the reader to this new multiple access technique that utilizes single carrier modulation along with orthogonal frequency multiplexing and frequency domain equalization. Single carrier frequency division multiple access sc fdma, a modified form of orthogonal fdma. Similar to orthogonal frequency division multiple access ofdma, sc fdma is highly sensitive to frequency offsets caused by oscillator inaccuracies and doppler spread, which lead to intercarrier interference ici.
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