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Visar resultat 1 - 5 av 26 avhandlingar som matchar ovanstående sökkriterier.

1. 1. Verification of wireless communication performance and robustness for automotive applications

   Författare :Mikael Nilsson; Kommunikationsteknologi; []
   Nyckelord :Vehicle-to-Vehicle; V2V; channel modeling; path loss; two-ray; obstruction; large scale fading; shadow fading; multiple links; diversity; correlation; over-the-air; OTA; multi-probe; multipath propagation simulator; fading emulation;

   Sammanfattning : Today's test methods used for verifying the performance and robustness of automotive applications using wireless communication are often based on fieldtrails, which are time consuming, costly, and not repeatable. Therefore, there is an urgent need for new verification methods that can be performed in lab environment, where the realistic radio propagation environment can be emulated. LÄS MER

3. 2. Path Dependence and Path Shaping : Unearthing institutional dynamics in large-scale project organizing

   Författare :Ermal Hetemi; Cali Nuur; Sofia Pemsel; Anna Jerbrant; KTH; []
   Nyckelord :SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; path dependence; path shaping; organisational lock-in; institutional field; knowledge work; Ledarskap; entreprenörskap och organisation; Ledarskap; entreprenörskap och organisation; Organisation theory; Organisationsteori; Industriell ekonomi; Industrial economy; Industriell ekonomi och organisation;

   Sammanfattning : Over the last two decades, large-scale project endeavors or major programs that typically deliver a substantial physical infrastructure or a complex product with a lifetime that can extend for decades and across industries have become the norm for many utility sectors, such as transport, energy, water, or food. The allure of ever-larger projects shows no sign of fading away in the face of sustainable development and grand societal challenges – quite the contrary. LÄS MER

4. 3. Optimization and Learning for Large-Scale MIMO-OFDM Wireless Systems : Theory, Algorithms, and Applications

   Författare :Shashi Kant; Carlo Fischione; Mats Bengtsson; Bo Göransson; Gabor Fodor; Christoph Studer; KTH; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; First-Order Optimization; Convex Optimization; ADMM; Three-operator ADMM TOP-ADMM ; EVM; OOBE; PAPR; ACLR; MIMO; OFDM; Federated Learning; Telecommunication; Telekommunikation; Optimeringslära och systemteori; Optimization and Systems Theory; Electrical Engineering; Elektro- och systemteknik;

   Sammanfattning : The requirements for next-generation wireless communications networks, particularly fifth-generation (5G) and beyond, are driven by at least three broad use cases. These include enhanced mobile broadband services to support extremely high data rates in terms of network or per user in both uplink and downlink, massive machine-type communications to accommodate massive internet-of-things applications, and critical machine-type communications to handle mission-critical applications that require ultra-high reliability and low latency. LÄS MER

5. 4. MIMO Systems with Residual Hardware Impairments

   Författare :Xinlin Zhang; Chalmers tekniska högskola; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; training length.; residual hardware impairments; large-scale MIMO; Achievable rate; channel estimation; channel capacity; energy efficiency;

   Sammanfattning : Recent years have witnessed an unprecedented explosion in mobile data traffic, due to the expansion of numerous types of wireless devices, which have enabled a plethora of data-hungry applications. Novel techniques, such as large-scale multiple-input multiple-output (MIMO) systems, represent potential candidates to support the ever-growing demands. LÄS MER

7. 5. On Radio Wave Propagation Measurements and Modelling for Cellular Mobile Radio Networks

   Författare :Erik Östlin; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Field strength measurements; path loss prediction; point-to-area; Recommendation ITU-R P.1546; artificial neural network; large- and small-scale fading characteristics;

   Sammanfattning : To support the continuously increasing number of mobile telephone users around the world, mobile communication systems have become more advanced and sophisticated in their designs. As a result of the great success with the second generation mobile radio networks, deployment of the third and development of fourth generations, the demand for higher data rates to support available services, such as internet connection, video telephony and personal navigation systems, is ever growing. LÄS MER