Sökning: "Channel feedback"

Visar resultat 41 - 45 av 103 avhandlingar innehållade orden Channel feedback.

  1. 41. Linearity Enhancements of Receiver Front-end Circuits for Wireless Communication

    Författare :Mohammed Abdulaziz; Institutionen för elektro- och informationsteknik; []
    Nyckelord :CMOS; receivers; operational transconductance amplifiers; filtering; channel select filters; stability; low noise amplifiers; linearization; carrier aggregation; spectrum sensing;

    Sammanfattning : Technology scaling in advanced CMOS nodes has been very successful in reducing the cost and increasing the operating frequency, however, it has also resulted in reduced transistor intrinsic gain and increased thermal noise coefficient, and most importantly, deteriorated linearity performance. At the same time, advanced wireless communication standards offer ever increasing data rates and pose more stringent requirements on coexistence, leading to very stringent linearity requirements. LÄS MER

  3. 42. Adaptive Baseband Pro cessing and Configurable Hardware for Wireless Communication

    Författare :Rakesh Gangarajaiah; Integrerade elektroniksystem; []
    Nyckelord :Wireless receivers; baseband processing; LTE-A; MIMO; OFDM; carrier aggregation; channel preprocessing; adaptive signal processing; non-linearity mitigation; massive MIMO;

    Sammanfattning : The world of information is literally at one’s fingertips, allowing access to previously unimaginable amounts of data, thanks to advances in wireless communication. The growing demand for high speed data has necessitated theuse of wider bandwidths, and wireless technologies such as Multiple-InputMultiple-Output (MIMO) have been adopted to increase spectral efficiency. LÄS MER

  4. 43. Intracellular signaling of phosphorylated insitol compounds : a study in pancreatic beta-cells and hippocampal neurons

    Författare :Jia Yu; Karolinska Institutet; Karolinska Institutet; []
    Nyckelord :InsP6; L-type Ca 2 channel; hippocampal neuron; Ins 1; 4; 5 P3; Ca2 ; cyt-MIPP; pancreatic beta-cell; PtdIns 3; 4; 5 P3; Ptdlns 3; 5 P2.;

    Sammanfattning : The family of phosphorylated inositol compounds consists of soluble cytosolic inositol phosphates and insoluble inositol phospholipids, localized in cellular membranes and the nuclear matrix. Although inositol phospholipids only account for 5-10% of total plasma membrane lipids, these compounds and their inositol phosphate derivatives play an important role in a broad range of cellular processes including intracellular Ca 2+ signalling, ion channel regulation, vesicle trafficking, both exo- and endocytosis, cell growth and apoptosis. LÄS MER

  5. 44. Designing Space-Time Codes Using Orthogonal Designs

    Författare :Girish Ganesan; Thomas Marzetta; Uppsala universitet; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Space-time codes; Orthogonal designs; Amicable orthogonal designs; Differential detection; Trellis codes; Turbo codes; Signal processing; Signalbehandling; Signalbehandling; Signal Processing;

    Sammanfattning : This thesis deals with coding schemes for systems with multiple transmit antennas. The problem of finding optimal transmission schemes for the case when the transmitter knows the channel and the case when the transmitter does not know the channel are considered. LÄS MER

  7. 45. Coordinated Transmission for Wireless Interference Networks

    Författare :Hamed Farhadi; Mikael Skoglund; David Gesbert; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Interference; Wireless Network; MIMO; Coordinated Transmission; Resource Allocation; Interference Alignment; Scheduling; Electrical Engineering; Elektro- och systemteknik;

    Sammanfattning : Wireless interference networks refer to communication systems in which multiple source–destination pairs share the same transmission medium, and each source’s transmission interferes with the reception at non-intended destinations. Optimizing the transmission of each source–destination pair is interrelated with that of the other pairs, and characterizing the performance limits of these networks is a challenging task. LÄS MER