Sökning: "Björn Ottersten"
Visar resultat 6 - 10 av 18 avhandlingar innehållade orden Björn Ottersten.
6. Antenna array mapping for DOA estimation in radio signal reconnaissance
Sammanfattning : To counter radio signal reconnaissance, an efficient way of covert communication is to use subsecond duration burst transmissions in the congested HF band. Against this background, the present thesis treats fast direction finding (DF) using antenna arrays with known response only in a few calibration directions. LÄS MER
7. Detection for multiple input multiple output channels : analysis of sphere decoding and semidefinite relaxation
Sammanfattning : The problem of detecting a vector of symbols, drawn from a finite alphabet and transmitted over a multiple-input multiple-output (MIMO) channel with Gaussian noise, is of central importance in digital communications and is encountered in several different applications. Examples include, but are not limited to; detection of symbols spatially multiplexed over a multiple-antenna channel and the multiuser detection problem in a code division multiple access (CDMA) system. LÄS MER
8. Analysis and Modelling of Joint ChannelProperties from Multi-site, Multi-Antenna RadioMeasurements
Sammanfattning : Future wireless communication systems will utilize the spatialproperties of the wireless channel to improve the spectralefficiency and thus increase capacity. This is realized bydeploying multiple antennas at both the transmitter and receiver. LÄS MER
9. Analysis of Radio Channel Measurements Using Multiple Base Stations
Sammanfattning : Future wireless communication systems will utilize the spatial properties of the wireless channel to improve the spectral efficiency and thus increase capacity. This is realized by deploying multiple antennas at both the transmitter and receiver. LÄS MER
10. MIMO Transceiver Design for Multi-Antenna Communications over Fading Channels
Sammanfattning : In wireless communications, the use of multiple antennas for both transmission and reception is associated with performance gains of fundamental nature. One such gain stems from the spatial-multiplexing capabilities of wireless multiple-input multiple-output (MIMO) channels: Many propagation environments admit several data streams to be conveyed in parallel over a single point-to-point link, setting the stage for significantly increased data rates. LÄS MER