Go to  Advanced Search

Bit-interleaved coded modulation for hybrid rf/fso systems

Show full item record

Files in this item

Files Size Format Description   View
ubc_2009_spring_he_xiaohui.pdf 405.0Kb Adobe Portable Document Format   View/Open
 
Title: Bit-interleaved coded modulation for hybrid rf/fso systems
Author: He, Xiaohui
Degree Master of Applied Science - MASc
Program Electrical and Computer Engineering
Copyright Date: 2008
Publicly Available in cIRcle 2008-12-11
Subject Keywords FSO; RF; BICM; Physical layer; Channel coding; Cut-off rate; Pairwise Error Probability; Codeword Error Probability; Ricean fading; Gamma-Gamma fading
Abstract: In this thesis, we propose a novel architecture for hybrid radio frequency (RF)/free–space optics (FSO) wireless systems. Hybrid RF/FSO systems are attractive since the RF and FSO sub–systems are affected differently by weather and fading phenomena. We give a thorough introduction to the RF and FSO technology, respectively. The state of the art of hybrid RF/FSO systems is reviewed. We show that a hybrid system robust to different weather conditions is obtained by joint bit–interleaved coded modulation (BICM) of the bit streams transmitted over the RF and FSO sub–channels. An asymptotic performance analysis reveals that a properly designed convolutional code can exploit the diversity offered by the independent sub–channels. Furthermore, we develop code design and power assignment criteria and provide an efficient code search procedure. The cut–off rate of the proposed hybrid system is also derived and compared to that of hybrid systems with perfect channel state information at the transmitter. Simulation results show that hybrid RF/FSO systems with BICM outperform previously proposed hybrid systems employing a simple repetition code and selection diversity.
URI: http://hdl.handle.net/2429/2868

This item appears in the following Collection(s)

Show full item record

All items in cIRcle are protected by copyright, with all rights reserved.

UBC Library
1961 East Mall
Vancouver, B.C.
Canada V6T 1Z1
Tel: 604-822-6375
Fax: 604-822-3893