(1999) DS-CDMA Chip Waveform Design for Minimal Interference under Bandwidth, Phase and Envelope Constraints. IEEE Transactions on Communications, 47 (11). pp. 1737-1746.
Full text not available from this repository.Abstract
This paper investigates the effect of chip waveform shaping on the error performance, bandwidth confinement, phase continuity, and envelope uniformity in direct-sequence code-division multiple-access communication systems employing offset quadrature modulation formats. An optimal design methodology is developed for the problem of minimizing the multiple-access interference power under various desirable signal constraints, including limited 99% and 99.9% power bandwidth occupancies, continuous signal phase, and near-constant envelope. The methodology is based on the use of prolate spheroidal wave functions to obtain a reduced-dimension discrete constrained optimization problem formulation. Numerous design examples are discussed to compare the performance achieved by the optimally-designed chip waveforms with other conventional schemes, such as offset quadrature phase-shift keying, minimum-shift keying (MSK), sinusoidal frequency-shift keying (SFSK), and time-domain raised-cosine pulses. In general, it is found that while the optimized chip pulses achieved substantial gains when no envelope constraints were imposed, these gains vanish when a low envelope fluctuation constraint was introduced. In particular, it is also shown that MSK is quasi-optimal with regard to the 99% bandwidth measure, while the raised-cosine pulse is equally good with both the 99% and 99.9% measures, but at the expense of some envelope variation. On the other hand, SFSK is quasi-optimal with regard to the 99.9% bandwidth occupancy, among the class of constant-to-low envelope variation pulses.
| Item Type: | Article |
|---|---|
| Subjects: | Electrical |
| Department: | College of Engineering and Physics > Electrical Engineering |
| Depositing User: | Obaid-Ur-Rehman Khattak |
| Date Deposited: | 25 Mar 2008 08:48 |
| Last Modified: | 01 Nov 2019 13:24 |
| URI: | http://eprints.kfupm.edu.sa/id/eprint/640 |