Show simple item record

dc.contributor.authorKhoshnevis, Ahmad
dc.creatorKhoshnevis, Ahmad 2007-10-31T00:49:22Z 2007-10-31T00:49:22Z 2001-04-20 2001-09-20
dc.description Masters Thesis
dc.description.abstract A fixed bandwidth expansion can be achieved either by coding or spreading, while each have different effect on the resultant signal space. Coding increases both Shannon and Fourier bandwidth whereas spreading only increases the Fourier bandwidth. In this document we are looking for the optimum combination of coding and spreading, in a Code Division Multiple Access (CDMA) system, that minimizes the average frame error rate under fading channel with multiple antennas at transmitter and receiver. Using the theory of lattice code, we show that in a system with K users, the optimum spreading factor N equals K. Simulation results support the analysis. In simulations we used Minimum Mean Square Error (MMSE), and Matched Filter (MF) as multi-user detector. We also assumed that receiver knows the Channel State Information (CSI). In case of multiple antennas Alamouti scheme at transmitter and Maximum Ratio Combining (MRC) at the receiver are applied.
dc.language.iso eng
dc.subjectlattice codes
dc.title Coding-Spreading Tradeoff for Lattice Codes
dc.type Thesis
dc.citation.bibtexName mastersthesis
dc.citation.journalTitle Masters Thesis 2003-07-12
dc.contributor.orgCenter for Multimedia Communications (
dc.subject.keywordlattice codes
bandwidth Masters
dc.type.dcmi Text
dc.type.dcmi Text
dc.identifier.citation A. Khoshnevis, "Coding-Spreading Tradeoff for Lattice Codes," Masters Thesis, 2001.

Files in this item


This item appears in the following Collection(s)

  • ECE Publications [1426]
    Publications by Rice University Electrical and Computer Engineering faculty and graduate students
  • Rice Wireless [268]
    Publications by Rice Faculty and graduate students in the Rice Wireless group

Show simple item record