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A fast OFDM-CDMA user demultiplexing architecture
dc.contributor.author | Marti Puig, Pere |
dc.contributor.author | Sala Álvarez, José |
dc.contributor.other | Universitat Politècnica de Catalunya. Departament de Teoria del Senyal i Comunicacions |
dc.date.accessioned | 2016-07-11T10:52:18Z |
dc.date.available | 2016-07-11T10:52:18Z |
dc.date.issued | 2000 |
dc.identifier.citation | Marti, 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.isbn | 0-7803-6293-4 |
dc.identifier.uri | http://hdl.handle.net/2117/88665 |
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. 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.extent | 4 p. |
dc.language.iso | eng |
dc.publisher | Institute of Electrical and Electronics Engineers (IEEE) |
dc.subject | Àrees temàtiques de la UPC::Enginyeria de la telecomunicació |
dc.subject.lcsh | Modulation (Electronics) |
dc.subject.other | Hadamard codes |
dc.subject.other | OFDM modulation |
dc.subject.other | Code division multiple access |
dc.subject.other | Computational complexity |
dc.title | A fast OFDM-CDMA user demultiplexing architecture |
dc.type | Conference report |
dc.subject.lemac | Modulació (Electrònica) |
dc.contributor.group | Universitat Politècnica de Catalunya. SPCOM - Grup de Recerca de Processament del Senyal i Comunicacions |
dc.identifier.doi | 10.1109/ICASSP.2000.860120 |
dc.description.peerreviewed | Peer Reviewed |
dc.relation.publisherversion | http://ieeexplore.ieee.org.recursos.biblioteca.upc.edu/stamp/stamp.jsp?tp=&arnumber=860120&tag=1 |
dc.rights.access | Open Access |
local.identifier.drac | 2415013 |
dc.description.version | Postprint (published version) |
local.citation.author | Marti, P.; Sala, J. |
local.citation.contributor | IEEE International Conference on Acoustics, Speech, and Signal Processing |
local.citation.pubplace | Istanbul |
local.citation.publicationName | 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 |
local.citation.startingPage | 3358 |
local.citation.endingPage | 3361 |