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A fast OFDM-CDMA user demultiplexing architecture

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dc.contributor Universitat de Vic. Escola Politècnica Superior
dc.contributor.author Martí i Puig, Pere
dc.contributor.author Sala Álvarez, J.
dc.date.accessioned 2012-11-29T13:52:27Z
dc.date.available 2012-11-29T13:52:27Z
dc.date.created 2000
dc.date.issued 2000
dc.identifier.citation Marti-Puig, P.; Sala-Alvarez, J.; , "A fast OFDM-CDMA user demultiplexing architecture," Acoustics, Speech, and Signal Processing, 2000. ICASSP '00. Proceedings. 2000 IEEE International Conference on , vol.6, no., pp.3358-3361 vol.6, 2000 ca_ES
dc.identifier.issn 0-7803-6293-4
dc.identifier.uri http://hdl.handle.net/10854/1938
dc.description.abstract A 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 [I]. 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 symboldependent combination of Walsh-Hadamard codes [2][3][4]. We derive a fast arquitecture 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. ca_ES
dc.format application/pdf
dc.format.extent 4 p. ca_ES
dc.language.iso eng ca_ES
dc.publisher IEEE ca_ES
dc.rights (c) IEEE
dc.rights Tots els drets reservats ca_ES
dc.subject.other Lògica matemàtica -- Congressos ca_ES
dc.title A fast OFDM-CDMA user demultiplexing architecture ca_ES
dc.type info:eu-repo/semantics/conferenceObject ca_ES
dc.rights.accesRights info:eu-repo/semantics/closedAccess ca_ES

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