Use this resource - and many more! - in your textbook!
AcademicPub holds over eight million pieces of educational content for you to mix-and-match your way.
DS-CDMA chip waveform design for minimal interference under bandwidth, phase, and envelope constraints
By: Stark, W.E.; Landolsi, M.A.;
1999 / IEEE
This item was taken from the IEEE Periodical ' DS-CDMA chip waveform design for minimal interference under bandwidth, phase, and envelope constraints ' 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.
Code Division Multiple Access
Spread Spectrum Communication
Land Mobile Radio
Sinusoidal Frequency-shift Keying
Ds-cdma Chip Waveform Design
Direct-sequence Code-division Multiple-access Communication Systems
Offset Quadrature Modulation Formats
Prolate Spheroidal Wave Functions
Reduced-dimension Discrete Constrained Optimization Problem
Optimally-designed Chip Waveforms
Optimized Chip Pulses
Multiple Access Interference
Communication, Networking And Broadcast Technologies