Efficient decision feedback receiver design for cellular CDMA spread spectrum communications Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/ms35td00t

Descriptions

Attribute NameValues
Creator
Abstract or Summary
  • This dissertation presents the continued study of a non-iterative decision feedback (DF) receiver/decoder design and its application to cellular communications or wireless local loop systems based on the IS-95(-A) standard of the Telecommunications Industry Association and also Personal Communications Services systems based on the American National Standards Institute standard J-STD- 008-1996, which use code-division multiple access (CDMA) spread spectrum technology. Specifically, the DF decoder presented herein can be used in the uplink of these systems, which simultaneously uses a concatenation of convolutional coding, interleaving, and orthogonal Walsh modulation. The main contributions of this dissertation are the demonstration that the DF concept works well in multipath fading environments, the design of a new time-efficient decoding algorithm, and a new interleaver design. Initially, the performance of the DF decoder is assessed in unfaded as well as Rayleigh fading multipath propagation in additive white Gaussian noise interference. Simulation results using coherent and noncoherent detection are presented for both independent Rayleigh fading and Rayleigh fading with a commonly used Doppler spectrum. The results show improved performance compared to conventional non-DF receivers using the same decoding metric. This is a prerequisite for application of the DF decoder in an actual mobile communications environment. The effectiveness of the initial DF decoder design, as it is applied to IS-95 based systems, is studied. It is found that the effectiveness of the DF decoder is determined by the decoding delay of the convolutional decoder and the interleaver specification. Based on these findings, two methodologies to improve the effectiveness of the DF decoder are investigated. First, the average decoding delay is reduced using sub-optimal convolutional decoding. Second, the combination of a new block interleaver design and the DF decoder is considered. Simulation results of average decoding delay, bit error rate and frame error rate are presented for coherent and noncoherent detection of unfaded and Rayleigh fading multipath signals. It is shown that both approaches result in better system performance, which can further improve the quality of service and/or capacity of an IS-95 based system. Finally, a simplified analysis of the DF decoder performance is presented.
Resource Type
Date Available
Date Copyright
Date Issued
Degree Level
Degree Name
Degree Field
Degree Grantor
Commencement Year
Advisor
Academic Affiliation
Non-Academic Affiliation
Subject
Rights Statement
Peer Reviewed
Language
Digitization Specifications
  • File scanned at 300 ppi (Monochrome, 8-bit Grayscale) using ScandAll PRO 1.8.1 on a Fi-6770A in PDF format. CVista PdfCompressor 4.0 was used for pdf compression and textual OCR.
Replaces
Additional Information
  • description.provenance : Made available in DSpace on 2012-09-07T20:44:00Z (GMT). No. of bitstreams: 1 VolzPatrickU1999.pdf: 13162936 bytes, checksum: 1badfc75abab9ead72b49756fcbf1bba (MD5) Previous issue date: 1999-05-07
  • description.provenance : Submitted by Kevin Martin (martikev@onid.orst.edu) on 2012-09-07T18:59:15Z No. of bitstreams: 1 VolzPatrickU1999.pdf: 13162936 bytes, checksum: 1badfc75abab9ead72b49756fcbf1bba (MD5)
  • description.provenance : Approved for entry into archive by Patricia Black(patricia.black@oregonstate.edu) on 2012-09-07T20:44:00Z (GMT) No. of bitstreams: 1 VolzPatrickU1999.pdf: 13162936 bytes, checksum: 1badfc75abab9ead72b49756fcbf1bba (MD5)
  • description.provenance : Approved for entry into archive by Patricia Black(patricia.black@oregonstate.edu) on 2012-09-07T20:41:42Z (GMT) No. of bitstreams: 1 VolzPatrickU1999.pdf: 13162936 bytes, checksum: 1badfc75abab9ead72b49756fcbf1bba (MD5)

Relationships

In Administrative Set:
Last modified: 08/20/2017

Downloadable Content

Download PDF
Citations:

EndNote | Zotero | Mendeley

Items