Search for dissertations about: "ofdma"

Showing result 1 - 5 of 11 swedish dissertations containing the word ofdma.

2. 1. Optimization of Joint Cell, Channel and Power Allocation in Wireless Communication Networks

   Author : Mikael Fallgren; Anders Forsgren; Zhi-Quan (Tom) Luo; KTH; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Wireless multicell networks; Optimization; OFDMA; Shannon capacity; Complexity; NP-hard; Relays; Allocation problems; Heuristic algorithms;

   Abstract : In this thesis we formulate joint cell, channel and power allocation problems within wireless communication networks. The objectives are to maximize the user with mini- mum data throughput (Shannon capacity) or to maximize the total system throughput, referred to as the max-min and max-sum problem respectively. READ MORE

4. 2. Network Optimization of Evolving Mobile Systems with Presence of Interference Coupling

   Author : Lei You; Di Yuan; Pierre Flener; Gabor Fodor; Uppsala universitet; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Resource optimization; load coupling; OFDMA; NOMA; Computer Science; Datavetenskap;

   Abstract : The rapid development from 4G to 5G of mobile communications poses significant challenges in providing high rate and capacity, making it more crucial for efficient utilization of time-frequency resource via optimally configuring the network. Mathematical optimization serves as a powerful tool for addressing this type of problems. READ MORE

5. 3. Radio Resource Optimization for OFDM-based Broadband Cellular Systems

   Author : Lei Lei; Di Yuan; Michael Reyer; Linköpings universitet; []
   Keywords : ;

   Abstract : The rapid growth of users’ traffic demand in broadband wireless communication systems requires high-speed data transmission and intelligent resource allocation approaches. The Third Generation Partnership Project-Long Term Evolution (3GPPLTE) has standardized multiple access (MA) schemes for 4G cellular networks. READ MORE

6. 4. Diversity and Interference Aspects in the Downlink of Code Division Multiple Access Systems

   Author : Anders Persson; Chalmers tekniska högskola; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; orthogonal frequency division multiplexing; multi-carrier modulation; Rayleigh-fading channels; code division multiple access; frequency-selective channels; multiple access interference; diversity;

   Abstract : This thesis consists of six included papers and technical reports, plus an introduction. The topic studied is interference and diversity aspects in code division multiple access (CDMA) systems for mobile cellular communications. The focus in the papers is on the downlink - the communication link from the base station to the mobile terminal. READ MORE

7. 5. Cross-layer Aspects in OFMDA Systems : Feedback, Scheduling and Beamforming

   Author : Patrick Svedman; Björn Ottersten; Ana I. Pérez-Neira; KTH; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Telecommunication; Telekommunikation;

   Abstract : This thesis mainly studies the downlink of a wireless multiuser system, where the transmitter has limited knowledge about the communication channels of the users. Key techniques to improve the performance of such systems are, for instance, multiple antennas, multiuser diversity and orthogonal frequency-division multiple access (OFDMA). READ MORE