Open Access
Chip Waveform Selection in Offset-Quaternary Direct-Sequence Spread-Spectrum Multiple-Access Communications
TLDR
An offset-quaternary direct-sequence spread-spectrum multiple-access communication system is analyzed, which considers the effect of the choice of chip waveforms on the bandwidth, the signal-to-noise ratio at each user's receiver, and the constant-envelope character of the transmitted signals.Abstract:
: An offset-quaternary direct-sequence spread-spectrum multiple-access communication system is analyzed. This analysis considers the effect of the choice of chip waveforms on the bandwidth which the system utilizes, the signal-to-noise ratio at each user's receiver, and the constant-envelope character of the transmitted signals. (Author)read more
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Journal ArticleDOI
Spread-Spectrum Multiple-Access Performance of Orthogonal Codes: Linear Receivers
Per Enge,D. Sarwate +1 more
TL;DR: This paper analyzes a direct-sequence, spread-spectrum, multiple-access SSMA communication system which assigns a set of M orthogonal sequences to each user, and obtains approximations for the multiuser probability of error by using a Gaussian approximation for the multiple- access interference.
Journal ArticleDOI
DS-CDMA chip waveform design for minimal interference under bandwidth, phase, and envelope constraints
TL;DR: 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 and finds that while the optimized chip pulses achieved substantial gains when no envelope constraints were imposed, these gains vanish when a low envelope fluctuations constraint was introduced.
Journal ArticleDOI
Asynchronous multiple-access interference suppression and chip waveform selection with aperiodic random sequences
TL;DR: A linear decentralized receiver capable of suppressing multiple-access interference for asynchronous direct-sequence code-division multiple- access (DS-CDMA) systems with aperiodic random signature sequences is proposed and performance bounds on this receiver are obtained.
Journal ArticleDOI
An optimal signal design for band-limited asynchronous DS-CDMA communications
Joon Ho Cho,James S. Lehnert +1 more
TL;DR: An optimal signal design for band-limited, asynchronous, direct-sequence code-division multiple-access (DS-CDMA) communications with aperiodic random spreading sequences and a conventional matched filter receiver is considered in an additive white Gaussian noise (AWGN) channel.
Journal ArticleDOI
Chip waveform design for DS/SSMA systems with aperiodic random spreading sequences
TL;DR: An approach to design waveforms that may result in interchip interference (ICI) is proposed and a criterion for design based on the conditional Gaussian approximation of the MAI for systems with aperiodic random spreading sequences is derived.