An Improved Code Acquisition Scheme for Band-limited DSSS Systems with Sampling Offset

Ding, Shuai; Yi, Zhou; Liu, Huijie; Liang, Xuwen

doi:10.1109/lcomm.2012.052112.120688

Cited by 11 publications

(3 citation statements)

References 5 publications

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“…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. 21,22 On the other hand, several works addressed waveform design for code tracking purposes, as in Landolsi and Hussain, 23 where the optimization of the tracking error variance was discussed based on a simplified noncoherent DLL model. Criteria that relate to pulse design for precise synchronization were discussed in Nossek and Antreich.…”

Section: Introductionmentioning

confidence: 99%

“…Acquisition schemes were also devised for band-limited spread-spectrum signals in previous studies. 21,22 On the other hand, several works addressed waveform design for code tracking purposes, as in Landolsi and Hussain, 23 where the optimization of the tracking error variance was discussed based on a simplified noncoherent DLL model. Likewise, in Antreich and Nossek, 24 a methodology for designing band-limited waveforms based on the constrained minimization of the Cramer-Rao lower bound for time delay estimation, and solutions were developed for GNSS applications.…”

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%

Section: Introductionmentioning

confidence: 99%

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

Landolsi

2018

Int J Communication

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“…In paper [12] the problem of code acquisition for band-limited DSSS systems, in the presence of sampling offset is studied. An improved acquisition scheme is presented which utilizes two decision variables (with and without the existence of sampling offset) for joint noncoherent detection.…”

Section: Introductionmentioning

confidence: 99%

Area Efficient Rapid Signal Acquisition scheme for High Doppler DSSS Signals

Reddy¹,

Savithri²

2013

IJCNC

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The Direct Sequence Spread Spectrum (DSSS) communication system is widely used in ground to air missile links due to its anti-jam and low Signal to Noise Ratio (SNR) requirement advantages. The paper presents the challenges in achieving fast signal acquisition in this scenario and brings out the implementation challenges for achieving simultaneous Doppler estimation and phase delay of Pseudo Noise (PN) code. A new scheme for PN code phase delay estimation with correlation of differential signals, followed by precise Doppler estimation using Fast Fourier Transform (FFT) is presented. The area optimized Field Programmable Gate Array (FPGA) friendly architecture is utilized for rapid signal acquisition by combining both time and frequency domain approaches. The advanced design practices inFPGAs are used to achieve resource sharing and high clock speed of operation. The architecture is synthesized for Virtex-6 LX240T FPGA, resulting in 52% of area occupancy and 134 MHz of maximum allowed clock frequency value.

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