Optimizes currently used physical layer based on 4g lte multiple access. A comprehensive analysis of the lte physical layer fahimeh rezaei, m. In order to report the feedback information pmi, cqi, ri to the bs and perform closedloop transmission, lteltea defines multiple aperiodic and periodic reporting modes, on the physical uplink shared channel pusch and physical uplink control channel pucch respectively, with different frequency granularity of the pmi and cqi. This technical white paper provides an overview of the lte physical layer phy, including technologies that are. This paper discusses the various options of dss implementation, including deployment challenges, possible impacts to data rates, and areas. Once the channel coding is performed, its output will be kept in a circular buffer where redundancy versions rvs are constituted. Unlimited viewing of the articlechapter pdf and any associated supplements and figures.
Abstractlongterm evolution lte represents an emerging and promising technology for providing broadband ubiquitous internet access. Long term evolution downlink physical layer simulation in. Overview of the 3gpp long term evolution physical layer. The content is presented in the form of bullet points to keep it concise and to allow rapid access to the key information. Studies new waveforms, nonorthogonal multiple access noma explores new spectrum beyond 52. Sends this information to the physical channel processor in the form of physical control channels. The data on the interface between the physical layer and the medium access control mac is in the form of transport blocks or of control information of the physical layer. Lte ue is similar to subscriber station of other technologies such as wimax,gsm etc. Pdcp packet data convergence protocol, rlc radio link control, and.
Physical layer overview and performance ieee communication theory workshop 2018 amitabha ghosh nokia fellow and head, radio interface group. However, despite its many advantages, ofdma has certain drawbacks such as high sensitivity to frequency offset resulting from instability of electronics and doppler spread. Modeling a 4g lte system in matlab idin motedayenaval senior applications engineer mathworks idin. Lte physical layer includes implantation of ofdm and receiver chain processing in ansi c. Pdf performance analysis of lteadvanced physical layer. The downlink physical layer of lte is based on ofdma. Lte physical layer model in matlab turbo channel coding mimo 1 ofdma adaptation of everything channel coding rate matching code block concatenation a. In section 3, we investigate the physical layer per. The key technology components of the nr physical layer are modulation schemes, waveform, frame structure, reference signals, multiantenna transmission and channel coding. The downsampling filter used for the initial synchronization and. Therefore, fitting the flexible physical layer design of nr around that of lte is needed in order to deploy dss on a shared spectrum. The simple answer is create matrices in such that the rank of matrix product of the whole process become maximum value. The new system, called longterm evolution lte, has been optimised for the packet.
For example, in a 5 mhz uplink lte signal, a pucch allocation of subframe 1, pucch index 0 means that pucch is transmitted on slot 2, rb0 and slot 3, rb24. Lte physical layer enodeb and ue physical layer in lte. Examples where the two lte modes are largely identical include the downlink physical layer channels, the use of resource blocks, the mapping of control channels to resource elements, the channel coding, the scrambling of each code word, the modulation types and how they work, and the basic implementations of mimo. In this document, we will run the oai software without the s1 interface to the mme and hss in the epc. Pcfich physical control format indicator channel downlink. Enhanced intercell interference control icic for noncarrier aggregation ca based deployments of heterogeneous networks for lte r1, r2, r3, r4 false. The information travels as far as the transport channel processor in the receiver, but is completely invisible to higher layers. Lte in bullets 2nd edition pdf the content is aimed towards anyone wishing to learn the basics, or to develop a more thorough understanding. Analysis of maclevel throughput in lte systems with link rate adaptation and harq protocols. Estimation of linklayer quality parameters in a system. Cpofdm and dftsofdm physical channels and modulation wave 2. Overview of the 3gpp long term evolution physical layer 1 1 introduction the 3gpp long term evolution lte represents a major advance in cellular technology. Pdf analysis of maclevel throughput in lte systems with.
Generation partnership project 3gpp introduced long term evolution lte. In this paper, the study of lte phy layer performance evaluation is conducted. The design of the lte physical layer phy is heavily influenced by the. Modulation schemes lte supports the qpsk, 16qam, 64qam and 256qam modulation formats, and all of these will also be supported by nr.
Estimation of link layer quality parameters in a systemlevel lte simulator p. Above figure depicts lte physical layer modules in ue transmitter part. Lte is designed to meet carrier needs for highspeed data and media transport as well as highcapacity voice support well into the next decade. The w1918 lte advanced baseband verification library saves time, reduces engineering effort and accelerates the maturity of 4g baseband phy designs for nextgeneration 3rd generation partnership project 3gpp long term evolution lte advanced systems. This mode is used for delay tolerant data but is loss sensitive such as file download where it is desired to minimize packet losses to save bandwidth utilization and enhance data rate. The lte link layer protocols are optimized for low delay and low overhead and are simpler than their counterparts in utran. This site is like a library, use search box in the widget to get ebook that you want.
Lte provides a packet switched model at the sap, but retains a circuit switched model at the phy. This article describes the lte link layer protocols, which abstract the physical layer and adapt its characteristics to match the requirements of higher layer protocols. Read 4g, lte advanced pro and the road to 5g online download pdf 4g, lte advanced pro and the road to 5g download epub 4g, lte advanced pro and the road to 5g. Getting started with 4g lte using eurecom openairinterface. Mimo technologies in 3gpp lte and lte advanced article pdf available in eurasip journal on wireless communications and networking 20091. The location of the pucch resource block in the second slot is the one that mirrors the location of the resource block in the first slot. Overview of the 3gpp long term evolution physical layer nxp. To avoid a new lte mac layer to coexist with wifi lbt, lte could use wifi mac and phy and tunnel lte provides fair use of spectrum with wifi as it is essentially wifi at the physical layer make use of a lte licensed cell similar to laa and aggregate the wifi channel makes core easier with a single entry point into epc. Lte physical and link layer upper control layers attach, authentication, query info, etc other rf technology such as wcdma, tdscdma emm layer rf driver and. Certification program test plan december 2011 1 revision 1. A physical layer abstraction is performed to predict link layer performance with a low. In this paper, we introduce a matlab and simulinkbased lte downlink physical layer simulator according to 3gpp specifications and. Exploring the physical layer frontiers of cellular uplink core. Software implementation and performance analysis of the.
In lte, data and control information are encoded down from the mac to the physical layer and decoded back from physical to mac layer to serve transport and control channels. Click download or read online button to get fundamentals of lte book now. In this paper, we present a matlabbased 19 lte physical layer simulator and investigate the gains in execution time when parallelizing the simulation. Rsrp is the most basic of the ue physical layer measurements and is the linear. However, lte has several other bene ts of which the most important are explained in the following. Synchronization signal sss, and physical broadcast channel pbch numerology of ssb depends on frequency band ue performs matched filtering to find pss 3 pss as in lte ue detects in frequencydomain sss pss and sss together indicate physical cell id in total 3336 1008 physical cell ids. In this paper, we present an indepth analysis of the ltea downlink physical layer characteristics and its performance. Lte 5x20 mhz 5g 100 mhz wideband 5g carrier is more efficient than multicarrier lte faster load balancing less common channel overhead no unnecessary guard bands between carriers. The projected processing requirements of an lte ue on the sb3500 are presented with the expected number of cores needed for the data rates analyzed. The physical layer itself maintains the continuous connection model, especially on the downlink, where there is continuous transmission. Lte eutran and its access side protocols radisys white paper 4 physical layer for eutran frame type in lte lte downlink and uplink transmissions are. This book presents the technical characteristics of the two radio network interfaces of mobile 4g, lte and lte advanced, based on release 8, 9 and 10 of the 3gpp specifications.
The binary for the oai enb physical layer is ltesoftmodemnos1. Lte physical layer model in matlab turbo channel coding mimo ofdma adaptation of everything open lte system model. Physical layer lte and lte advanced wiley online library. Rsrp dbm rssi dbm 10log 12n where rssi received signal strength indicator n. The most important thing is to figure out what kind of matrix i have to use for each steps. Such a unit is assigned a sequence number, and is managed as a distinct entity by the arq state machines.
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