Turbo Receiver for Spread Spectrum Systems Employing Parity Bit Selected Spreading Sequences

FieldValue
dc.contributor.authorMirzaee, Alireza
dc.date.accessioned2012-01-25T20:34:35Z
dc.date.available2012-01-25T20:34:35Z
dc.date.created2012
dc.date.issued2012
dc.identifier.urihttp://hdl.handle.net/10393/20635
dc.identifier.urihttp://dx.doi.org/10.20381/ruor-5408
dc.description.abstractIn spread spectrum systems employing parity bit selected spreading sequences, parity bits generated from a linear block encoder are used to select a spreading code from a set of mutually orthogonal spreading sequences. In this thesis, turbo receivers for SS-PB systems are proposed and investigated. In the transmitter, data bits are rst convolutionally encoded before being fed into SS-PB modulator. In fact, the parity bit spreading code selection technique acts as an inner encoder in this system without allocating any transmit energy to the additional redundancy provided by this technique. The receiver implements a turbo processing by iteratively exchanging the soft information on coded bits between a SISO detector and a SISO decoder. In this system, detection is performed by incorporating the extrinsic information provided by the decoder in the last iteration into the received signal to calculate the likelihood of each detected bit in terms of LLR which is used as the input for a SISO decoder. In addition, SISO detectors are proposed for MC-CDMA and MIMO-CDMA systems that employ parity bit selected and permutation spreading. In the case of multiuser scenario, a turbo SISO multiuser detector is introduced for SS-PB systems for both synchronous and asynchronous channels. In such systems, MAI is estimated from the extrinsic information provided by the SISO channel decoder in the previous iteration. SISO multiuser detectors are also proposed for the case of multiple users in MC-CDMA and MIMO-CDMA systems when parity bit selected and permutation spreading are used. Simulations performed for all the proposed turbo receivers show a signi cant reduction in BER in AWGN and fading channels over multiple iterations.
dc.language.isoen
dc.publisherUniversité d'Ottawa / University of Ottawa
dc.subjectspread spectrum communication
dc.subjectCDMA
dc.subjectturbo receiver
dc.subjectMUD
dc.subjecterror control coding
dc.subjectMIMO
dc.subjectsoft input soft output detector
dc.titleTurbo Receiver for Spread Spectrum Systems Employing Parity Bit Selected Spreading Sequences
dc.typeThesis
dc.faculty.departmentGénie électrique / Electrical Engineering
dc.contributor.supervisorD'Amours, Claude
dc.embargo.termsimmediate
dc.degree.namePhD
dc.degree.leveldoctorate
dc.degree.disciplineGénie / Engineering
thesis.degree.namePhD
thesis.degree.levelDoctoral
thesis.degree.disciplineGénie / Engineering
uottawa.departmentGénie électrique / Electrical Engineering
CollectionThèses, 2011 - // Theses, 2011 -

Files