This thesis investigates the impact of pilot contamination and other interference, namely data to pilot interference, on the performance of finite massive mimo systems with synchronized and unsynchronized pilots. Unlimited capacity in wireless networks with massive mimo. Hardware implementation of baseband processing for massive mimo. Massive mimo in real propagation environments gao, xiang lu in series of licentiate and doctoral theses. Graduate thesis or dissertation multiuser massive mimo. Results show that there are signi cant di erences in sum rate performance.
Massive mimo technology is one of the most promising technologies that has the potential to be the standard technology for the next generation of wireless communication systems. Massive mimo systems envision accurate beamforming. Performance analysis of multiuser massive mimo systems. Weight optimization methods of massive multipleinput multipleoutput mimo antennas are proposed and verified. Throughput analysis of massive mimo uplink with onebit adcs. This thesis investigates the achievable uplink throughput in a massive mimo system under the presence of onebit converters. Understanding the basics of mimo communication technology.
Emilbjornson divisionofcommunicationsystems departmentofelectricalengineeringisy. The base station is assumed not to have any a priori channel state information. Abstract mobile communications are now evolving towards the fifth generation 5g. Throughput analysis of massive mimo uplink with onebit adcs sven jacobsson. Previous attempts at applying the kf to estimate fast fading coefficients of a massive multiple input multiple output mimo channel assume that the channel autocorrelation is constant or varies weakly. This paper addresses the beam search complexity for massive multipleinput multipleoutput mimo in millimeter wave mmwave band. Doctoral thesis approximate inference in massive mimo. Hardware implementation of baseband processing for massive mimo prabhu, hemanth 2017 document version. Receiver design for massive mimo a thesis submitted in partial ful.
Expectationsfor5gnetworks 5g nextnetworkgeneration tobeintroducedaround2020 designobjectivesarecurrentlybeingdefined. Training in massive mimo systems university of canterbury. Uplink pilot contamination in tdd massive mimo scheme. Graduate thesis or dissertation massive mimo channel. A paradigm for 5g is the first book of its kind to hinge together related discussions on mmwave and massive mimo under the umbrella of 5g networks. Massive mimo systems subject to composite shadowingfading environment by muhammad saad zia nust201260920mseecs61212f supervisor dr.
Electronics free fulltext massive mimo wireless networks. Thesis for the degree of master in science throughput analysis of massive mimo uplink with onebit adcs sven jacobsson department of signals and systems. In the paper massive mimo has unlimited capacity, the authors used three different channel correlation models and i was wondering which one. New networking scenarios are identified, along with fundamental design requirements for mmwave massive mimo networks from an architectural and practical perspective. Mm networks, where massive mimo operates alongside other emerging 5g. It has been incorporated into standards like long term evolution lte and ieee802. University of oulu, degree programme in computer science and engineering. In this dissertation, we focus on the performance of massive mimo. The novel contributions in this thesis are presented in three sections. Massive multipleinput multipleoutput mimo technology is considered as one of the enabling technologies to scale up the data rates for the future communication systems. Fundamentals of massive mimo written by pioneers of the concept, this is the rst complete guide to the physical and engineering principles of massive mimo. Massive multipleinputmultipleoutput mimo systems use few hundred antennas to simultaneously serve large number of wireless broadband terminals.
Chalmers university of technology gothenburg, sweden 2015 masters thesis ex0062015. Hardware implementation of baseband processing for massive. Thesis for the degree of master in science throughput analysis of massive mimo uplink. Optimal capacity and energy efficiency of massive mimo systems. Of specific interest is how to aquire channel state information, crucial for gaining the benefits of massive mimo, and how to handle effects of the lack therof. Abstract the development of mobile telecommunication systems is a constant process and there is a high demand to add new features and further enhance the long term evolution advanced ltea, also known as 4g. This thesis focuses on the design and analysis of low complexity precoding schemes. In this paper, we follow up on our earlier exposition 1, with a focus on the developments in the last three years. Pdf channel estimation and precoding for massive mimo. Massive multipleinputmultipleoutput mimo is a wireless communication technology that uses a large number of antennas at the base station and serves multiple terminals over the same timefrequency resource.
It concludes that in a massive mimo system, the user terminals uts do not. Standard mimo networks tend to use two or four antennas. Due to the fact that the carrier frequency of 5g massive mimo systems reach tens of giga hertz, the channel autocorrelation could vary more. Our research compares the impact of block fading and timeselective fading channel models in massive mimo systems.
To achieve this, we derive a novel closed form sum rate expression for timeselective channels. Massive mimo massive mimo is an emerging technology, that scales up mimo by possibly orders of magnitude compared to current stateoftheart. In this thesis, four massive mimo channel models have been proposed. Massive mimo systems envision accurate beamforming and decoding with simpler and. Abstract massivemimo multipleinputmultipleoutput isamultiantennatech nologyforcellularwirelesscommunication,wherethebasestationusesa. A massive mimo system uses hundreds of antennas at the base station bs to simultaneously serve tens of users. Pdf joint precoding and antenna selection in massive mimo. Unsynchronizing the pilots can reduce pilot contamination, but it can produce data to pilot interference.
Theres no set figure for what constitutes a massive mimo setup, but the description tends to be applied to systems with tens or even hundreds of antennas. Massive mimo is the currently most compelling sub6 ghz physicallayer technology for future wireless access. The investigations in the thesis conclude that massive mimo works efficiently in real propagation environments. This technique can achieve higher data rates than existing communication technology, which only serves one terminal per resource. Assuming only a basic background in communications and statistical signal processing, it will guide readers through key topics in multicell systems such as propagation modeling. These advances have brought mmwave communications, untenable almost two decades 1 ago, to manageable today. In cellfree massive mimo, on the other hand, distributed access points aps are connected to a central processing unit cpu and jointly serve distributed users. This thesis aims to characterize massive mimo channels in every possible scenario for a typical sevencell hexagonal configuration. An overview of research topics and challenges for 5g massive. Asymptotic performance of multiuser massive mimo systems.
Specifically, we implement physical downlink shared channel baseband. Performance analysis of massive mimo systems in the. One research contribution which is not presented in the thesis, but has been published during my. American university of beirut large multiuser mimo. Basically, the more the antennas, the better shall be the performance. Fortunately, millimeterwave mmwave massive mimo provide a judicious way to harness all of these approaches to provide a wireless networking platform constituting a wireless network of small cells and providing very high speed data rate. Publishers pdf, also known as version of record link to publication citation for published version apa. Spectral efficiency and energy efficiency in massive mimo. An overview of research topics and challenges for 5g massive mimo antennas elias yaacoub faculty of computer studies, arab open university beirut, lebanon email. Massive mimo is an antenna technology that is considered the most promising for future superfast 5g networks, although researchers have until now. Asymptotic performance of multiuser massive mimo systems by.
In massive mimo, the base station estimates the radio channel by. In this thesis, we investigate the problem of efficient data detection in large. Massive mimo channel modelling for 5g wireless communication. Cellfree massive mimo and millimeter wave channel modelling. Massive mimo, on the other hand, is a mimo system with an especially high number of antennas. First, a low complexity hybrid precoding scheme is proposed for the downlink transmission of massive multiuser mimo systems with a finite dimensional channel model. The department of electrical and information technology. Aass enable stateoftheart beamforming and multipleinput, multipleoutput mimo techniques that are powerful tools for improving enduser experience, capacity and coverage. Spectral efficiency and energy efficiency in massive mimo systems. Millimeter wave massive mimo beamforming communication simulator design. In this thesis, we investigate the uplink pilot contamination in time division duplexing. However, the low throughput of celledge users remains a limitation in realistic multicell massive mimo systems.
This thesis investigates the performance of cellfree massive mimo. Syed ali hassan department of electrical engineering a thesis submitted in partial ful llment of the requirements for the degree of masters of science in electrical engineering ms ee in. Thesis pdf available february 2018 with 1,538 reads. Channel estimation and precoding for massive mimo downlink time division duplex system. Therefore we operate the massive mimo in tdd system and assume that downlink channel is reciprocal of uplink channel. Performance analysis of massive mimo systems in the presence.
Millimeter wave massive mimo beamforming communication. It provides high throughput 11, 12, allowing to reap all the bene ts. Massive mimo for 5g wireless networks ubc open collections. In the rst part, we focus on fundamental limits of the system performance under. Interference mitigation in 5g massive mimo networks. Abstract this thesis implements long term evolution lte transmission layer on a coarse grained reconfigurable called, dynamically reconfigurable resource array drra. This chapter aims to briefly introduce mmwave massive mimo from a high level.