Rapid direct sequence spread spectrum code synchronization using a complex matched filter on an FPGA

Koets, Michael A.; Lillywhite, Michael D.; McDaniel, Larry T.; Lecocke, Meredith Beveridge

doi:10.1109/acssc.2009.5469932

Cited by 1 publication

(2 citation statements)

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“…On the other hand, the accrued multiaccess interference resulting from simultaneous asynchronous transmissions and consequently the system bit error performance strongly depend on signal waveform shaping as well. 14,15 Acquisition performance enhancement algorithms were also introduced for binary offset carrier signaling schemes used in GNSS. For a DS-SS receiver timing synchronization system employing initial coarse timing search followed by fine delay-locked loop (DLL) tracking, it is found that the signaling waveforms properties play an important role affecting timing acquisition capability and residual jitter.…”

Section: Introductionmentioning

confidence: 99%

“…13 Several research contributions focused on the design of fast acquisition schemes for efficient hardware implementation. 14,15 Acquisition performance enhancement algorithms were also introduced for binary offset carrier signaling schemes used in GNSS. [16][17][18] Signal design under various constraints was discussed in Landolsi 19 where full-and partial-response waveforms were proposed for the maximization of timing acquisition probability and in Giunta et al 20 where constrained optimization for noncoherent acquisition of DS-SS signals was based on generalized Q-functions.…”

Section: Introductionmentioning

confidence: 99%

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Novel signals for optimized timing synchronization in direct‐sequence spread‐spectrum communication systems

Landolsi

2018

Int J Communication

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The paper presents design techniques for novel signaling waveforms to optimize timing synchronization in direct-sequence spread-spectrum communication systems. Both coarse code timing acquisition and fine delay-locked loop tracking systems are considered, and their performance metrics are analyzed in terms of initial acquisition detection probability and residual tracking jitter, showing a strong dependency on signal waveform spectral characteristics. Bit error performance under imperfect synchronization is also assessed. A design methodology is formulated with a low complexity parametric optimization approach based on prolate spheroidal waveform expansions for the generation of signals that minimize the probability of acquisition miss and tracking error jitter subject to additional constraints on signal energy and phase transitions. Novel optimized waveforms are synthesized with different levels of effective root mean square bandwidth occupancy and compared with conventional pulses to illustrate their advantages. Performance trade-offs are demonstrated between the acquisition and tracking systems, whereby signals with low effective bandwidth are found to have better acquisition capability at the expense of poorer tracking jitter, while the converse holds for signals with higher effective bandwidth. It is found that an effective root mean square bandwidth occupancy in the range of 40% to 50% of the chip rate can achieve a good compromise between the requirements of the 2 code timing synchronization phases. Numerical results are presented to quantify the relative merits of representative waveforms with respect to the different performance measures in terms of acquisition capability, tracking jitter, and bit error probability.

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Section: Introductionmentioning

confidence: 99%