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Visar resultat 1 - 5 av 491 avhandlingar som matchar ovanstående sökkriterier.
1. MIMO Systems with Residual Hardware Impairments
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
2. Statistical Analysis of Hardware Impairments in Communication Systems
Sammanfattning : This thesis delves into the study of hardware impairments, the inevitable limiting factors in radio frequency (RF) communication systems, and their substantial influence on system performance. It addresses the incongruity between the often stringent requirements imposed by standards and the innate imperfections of analog circuits present in real-world RF electronics. LÄS MER
3. Autism and ADHD in children with cerebral palsy
Sammanfattning : BACKGROUND: Autism spectrum disorder (autism) and attention-deficit/hyperactivity disorder (ADHD) are likely underdiagnosed in children with cerebral palsy (CP). Early identification of impairments is important for adequate understanding and support. LÄS MER
4. How to Make Bicycling Safer - Identification and Prevention of Serious Injuries among Bicyclists
Sammanfattning : The overall aim of this thesis was to guide current and future safety improvements that address serious injuries among bicyclists. The thesis is compiled by four studies, of which the first two aimed to identify injuries leading to loss of health from a biopsychosocial perspective, and the two following studies aimed to understand how these injuries occur and how they can be prevented. LÄS MER
5. Characterization and Compensation of Hardware Impairments in Transmitters for Wireless Communications
Sammanfattning : Increasing demands for data rate, energy efficiency and reliability in wireless communications have resulted in the introduction of radio frequency (RF) multiple input multiple output (MIMO) transmitters. However, MIMO transmitters suffer from additional crosstalk impairments along with the power amplifier (PA) and I/Q imbalance distortions observed in single input single output (SISO) transmitters. LÄS MER