Design of Modified UCHT Sequences
| Document type: | Conference Papers |
|---|---|
| Peer reviewed: | Yes |
| Author(s): | Gregory Cresp, Hai Huyen Dam, Hans-Jürgen Zepernick |
| Title: | Design of Modified UCHT Sequences |
| Conference name: | IEEE Symposium on Trends in Communications |
| Year: | 2006 |
| Pagination: | 40-43 |
| Publisher: | IEEE |
| City: | Bratislava |
| Organization: | Blekinge Institute of Technology |
| Department: | School of Engineering - Dept. of Signal Processing (Sektionen för teknik – avd. för signalbehandling) School of Engineering S- 372 25 Ronneby +46 455 38 50 00 http://www.tek.bth.se/ |
| Authors e-mail: | crespg@watri.org.au, dam@watri.org.au, hans-jurgen.zepernick@bth.se |
| Language: | English |
| Abstract: | In this paper, we consider the design of a class of unified complex Hadamard transform (UCHT) sequences. An effi- cient modification is imposed to those sequences to better suit applications in asynchronous code-division multiple- access (CDMA) systems. These modified UCHT sequences preserve the orthogonality of the original UCHT sequences and offer increased design options due to an increased number of parameters. The design of UCHT, modified UCHT, and Oppermann sequences is then formulated with reference to optimizing the maximum nontrivial aperiodic correlation value. These optimization problems can then be solved efficiently using a genetic algorithm with the maximum nontrivial aperiodic correlation value serving in the definition of a fitness function. Numerical examples illustrate the benefits of modified UCHT sequences over the original UCHT sequences. |
| Subject: | Telecommunications\General |
