| Author | Zhang, Xiaofan |
| Call Number | AIT Thesis no. TC-93-8 |
| Subject(s) | Spread spectrum communications
|
| Note | A thesis submitted in partial fulfillment of the requirement for the degree of
Master of Engineering, School of Engineering and Technology |
| Publisher | Asian Institute of Technology |
| Abstract | The performance of Direct Sequence Code-Division Multiple-Access
(DS/CDMA) communication systems is heavily dependent on the receiver structure
and the signature codes used. This thesis presents the analyses and investigations
into the performance of DS/CDMA systems using structured signature codes
(SSCs). Expressions for the signal to noise ratio (SNR) and the bit error rate (BER)
at the output of the correlator in a bipolar baseband DS/CDMA system are derived.
The analyses consider both worst and average interference conditions. These
expressions are used to evaluate the SNR and BER petfonnance both as a function
of~e subset size (i.e., equivalent to the number of simultaneous users) and as a
function of EJN0 • An analysis of the optimum matched filter (OMF) for bipolar
baseband DS/CDMA applications is presented. Three large sets of SSCs are
constructed, from which three good subsets of SSCs are selected for use with an
OMF detector. The performance parameters, in terms of SNR, BER and spectral
efficiency, of these three subsets of SSCs are assessed in a bipolar baseband
DS/CDMA system. The performance results for SSCs show that the significant
improvements over the expected performance, which is produced by an equivalent
set of random binary sequences and classical matched filter detection, are mainly
due to the SSCs used and secondly due to the OMF detector adopted. |
| Year | 1993 |
| Type | Thesis |
| School | School of Engineering and Technology (SET) |
| Department | Other Field of Studies (No Department) |
| Academic Program/FoS | Telecommunications (TC) |
| Chairperson(s) | O'Farrell, Timothy
|
| Examination Committee(s) | Lockmann, Steffen ;Takahashi, Kenzo
|
| Scholarship Donor(s) | ADB Japan |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 1993 |