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dc.contributor.authorMarti Puig, Pere
dc.contributor.authorSala Álvarez, José
dc.contributor.otherUniversitat Politècnica de Catalunya. Departament de Teoria del Senyal i Comunicacions
dc.date.accessioned2016-07-11T10:52:18Z
dc.date.available2016-07-11T10:52:18Z
dc.date.issued2000
dc.identifier.citationMarti, P., Sala, J. A fast OFDM-CDMA user demultiplexing architecture. A: IEEE International Conference on Acoustics, Speech, and Signal Processing. "ICASSP 2000: 2000 IEEE international conference on acoustics, speech, and signal processing: silver anniversary, proceedings: 5-9 June 2000: Hilton Hotel and Convention Center, Istanbul, Turkey". Istanbul: Institute of Electrical and Electronics Engineers (IEEE), 2000, p. 3358-3361.
dc.identifier.isbn0-7803-6293-4
dc.identifier.urihttp://hdl.handle.net/2117/88665
dc.description.abstractA fast algorithm based on a butterfly structure is presented that demultiplexes the symbols of a particular type of MC-MA (multi-carrier multiple-access) modulation previously proposed for indoor radio communications. A special transform is used to packetize the different symbols on the down-link such that the code sequences associated with the different symbols are transmitted synchronously at the base station. The input to the FFT bins is defined as a symbol-dependent combination of Walsh-Hadamard codes. We derive a fast architecture that can combine the common redundancy found in the Walsh-Hadamard and the inverse Fourier transform. In the direct implementation, the receiver would compute the IFFT (as in OFDM) before the Walsh-Hadamard transform. The proposed algorithm evaluates both transforms in a single step. A general expression for the butterfly weights is derived and the savings in computational complexity in terms of the frame length is evaluated.
dc.format.extent4 p.
dc.language.isoeng
dc.publisherInstitute of Electrical and Electronics Engineers (IEEE)
dc.subjectÀrees temàtiques de la UPC::Enginyeria de la telecomunicació
dc.subject.lcshModulation (Electronics)
dc.subject.otherHadamard codes
dc.subject.otherOFDM modulation
dc.subject.otherCode division multiple access
dc.subject.otherComputational complexity
dc.titleA fast OFDM-CDMA user demultiplexing architecture
dc.typeConference report
dc.subject.lemacModulació (Electrònica)
dc.contributor.groupUniversitat Politècnica de Catalunya. SPCOM - Grup de Recerca de Processament del Senyal i Comunicacions
dc.identifier.doi10.1109/ICASSP.2000.860120
dc.description.peerreviewedPeer Reviewed
dc.relation.publisherversionhttp://ieeexplore.ieee.org.recursos.biblioteca.upc.edu/stamp/stamp.jsp?tp=&arnumber=860120&tag=1
dc.rights.accessOpen Access
local.identifier.drac2415013
dc.description.versionPostprint (published version)
local.citation.authorMarti, P.; Sala, J.
local.citation.contributorIEEE International Conference on Acoustics, Speech, and Signal Processing
local.citation.pubplaceIstanbul
local.citation.publicationNameICASSP 2000: 2000 IEEE international conference on acoustics, speech, and signal processing: silver anniversary, proceedings: 5-9 June 2000: Hilton Hotel and Convention Center, Istanbul, Turkey
local.citation.startingPage3358
local.citation.endingPage3361


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