Search results for "WCDMA"
showing 6 items of 6 documents
Studies on high speed uplink packet access performance enhancements
2014
Multi-user interference mitigation under limited feedback requirements for WCDMA systems with base station cooperation
2016
One of the techniques that has been recently identified for dealing with multi-user interference (MUI) in future communications systems is base station (BS) cooperation or joint processing. However, perfect MUI cancellation with this technique demands severe synchronization requirements, perfect and global channel state information (CSI), and an increased backhaul and signaling overhead. In this paper, we consider a more realistic layout with the aim of mitigating the MUI, where only local CSI is available at the BSs. Due to synchronization inaccuracies and errors in the channel estimation, the system becomes partially asynchronous. In the downlink of wideband code division multiple access …
Performance enhancements of MBMS and VoIP services in WCDMA/HSPA networks
2009
Performance of advanced transmission and reception algorithms for high speed downlink packet access
2008
Nykyisten kolmannen sukupolven (3G) matkaviestinverkkojen suorituskykyä voidaan parantaa huomattavasti käyttämällä erilaisia kehittyneitä tekniikoita tukiasemissa ja matkaviestimissä. Suorituskyvyn lisääminen on tarpeen langattoman liikenteen jatkuvasti kasvaessa. – Ihmisten liikkuvuus on huipussaan ja esimerkiksi työn sidonnaisuus yhteen paikkaan on vähentynyt. Tarve olla jatkuvasti yhteydessä tietoverkkoon on samalla lisääntynyt. Yhä useammalla on esimerkiksi ns. liikkuva laajakaista, jolla nopea Internet-yhteys on riippumaton paikasta, Nihtilä toteaa. Nihtilä tutki väitöskirjassaan erilaisten lähetin- ja vastaanotinalgoritmien suorituskykyä 3G-teknologia WCDMA:n (Wideband Code Division M…
Advanced receivers and antenna diversity in WCDMA HSDPA
2007
Enhancing the performance of HSDPA communication with multipoint transmission techniques
2015
The evolution of mobile phones, tablets and other mobile communication devices has led to a significant increase in the amount of data delivered over mobile networks. In order to satisfy the climbing data rate demands of customers, existing mobile broadband networks are being expanded with new features that allow ubiquitous and consistent networking experience. This research presents three multipoint transmission techniques for Wideband Code Division Multiple Access (WCDMA) based High-Speed Downlink Packet Access (HSDPA) communication protocol. Multiflow, High-Speed Single-Frequency Network (HS-SFN) and Multipoint-to-Point Single-Frequency Network (M2P-SFN) enable transmission of user-dedicat…