Digital communication in wireline and wireless environments
1999 (English)Licentiate thesis, comprehensive summary (Other academic)
This thesis consists of an introduction and five parts dealing with digital communication. Three parts address Discrete Multi-Tone modulation (DMT), a wireline form of Orthogonal Frequency Division Multiplexing (OFDM). One part addresses channel estimation in wireless OFDM and one addresses multiuser detection in wireless Direct Sequence-Code Division Multiple Access (DS- CDMA).The first part presents a new duplex method, called Zipper, for Very High bit rate Digital Subscriber Lines (VDSL). It is a duplex method that offer high flexibility and compatibility with existing services in the access network. The second part presents a digital Radio Frequency Interference (RFI) suppression method. It is located in the frequency domain and it can be used by any DMT-based VDSL system. The third part presents a method to run Zipper in an asynchronous mode with only a small performance loss. This can be of interest for telecom operators when constructing a VDSL system. The fourth part examines the trade-off between pilot symbol spacing and symbol error rate in a wireless OFDM system using Pilot Symbol Assisted Modulation (PSAM). The last part presents a low complexity multiuser detector for wireless DS-CDMA. It consists of a pipelined detector structure that produces Maximum Likelihood Secence Detector (MLSD) decisions on some of the received bits in the sequence. The remaining, previously undetected bits, are fed to a secondary post-processor.
Place, publisher, year, edition, pages
Luleå: Luleå tekniska universitet, 1999. , 101 p.
Licentiate thesis / Luleå University of Technology, ISSN 1402-1757 ; 1999:13
Research subject Signal Processing
IdentifiersURN: urn:nbn:se:ltu:diva-17330Local ID: 2dc0eed0-e288-11db-b078-000ea68e967bOAI: oai:DiVA.org:ltu-17330DiVA: diva2:990332
Godkänd; 1999; 20070404 (ysko)2016-09-292016-09-29Bibliographically approved