Parallel acquisition of PN sequences in DS/SS systems

Chawla, K.; Sarwate, D.V.

doi:10.1109/26.285151

Cited by 77 publications

(18 citation statements)

References 6 publications

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“…Exiting strategies for code acquisition are single and multiple dwell detectors [1], matched filters [2], sequential [3] and parallel detection [4]. Because of the frequency uncertainty, the most common approach is to sequentially search all code phases over the range of Doppler frequency offsets, which may lead to a large of acquisition time since it needs to search all time and frequency units.…”

Section: Introductionmentioning

confidence: 99%

A High-Accuracy Frequency Estimation Approach Based on Segmental-FFT for Code Fast Acquisition

Huan

Tao

2011

2011 First International Conference on Instrumentation, Measurement, Computer, Communication and Control

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In this paper, to solve the problem of the Doppler estimation limited by FFT in the traditional code acquisition scheme based on FFT, a method of Doppler estimation for code acquisition based on segmental-FFT phase difference is proposed. First, the despreaded baseband data with Doppler frequency is divided into two segments and the FFT is applied on them individually. Then, with the help of the phase difference of the two FFT spectrum at their maximum amplitude position, the Doppler frequency is estimated. At last, a coherent accumulation method is designed according to the phase difference. By theoretical analysis and simulation, the RMS errors of this frequency estimation method is close to CR bound, and the new coherent accumulation gain is higher than non-coherent accumulation gain but lower than the conventional coherent accumulation gain, meanwhile the calculating amount is less than the conventional coherent accumulation.

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Section: Introductionmentioning

confidence: 99%

A High-Accuracy Frequency Estimation Approach Based on Segmental-FFT for Code Fast Acquisition

Huan

Tao

2011

2011 First International Conference on Instrumentation, Measurement, Computer, Communication and Control

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“…However, when the receiver has no knowledge about the transmitter's PN sequence (e.g., when intercepting an unfriendly transmission), all the related issues of synchronization, multipath equalization, and data detection become more challenging. Much of the literature has focused on the problem of synchronization or "code-delay acquisition" under various interferences and multipath environments when the PN sequence is known to the receiver [3]. However, the literature is not equally rich when the PN sequence is unknown.…”

Section: Introductionmentioning

confidence: 99%

Multichannel Convolution Blind Separation Algorithm for MIMO DSSS/CDMA System

Cheng

Wei

2007

Circuits Syst Signal Process

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Direct-sequence spread-spectrum (DSSS)/code division multiple access (CDMA) transmissions are now widely used for secure communications and multiple access. They can be transmitted at a low signal-to-noise ratio, and have a low probability of interception and capture. How to obtain the original users' signal in a noncooperative context or estimate the spreading sequence in blind conditions is a very difficult problem. Most of the signal sources are assumed to be instantaneous mixtures. In fact, the received CDMA signals are linearly convoluted. A more complicated blind source separation (BSS) algorithm is required to achieve better source separation. In this paper, a new BSS algorithm is proposed for separating linearly convolved signals in CDMA systems when the mixture coefficients of the signal and channel response are totally unknown, but some knowledge about the temporal model does exist. This algorithm is based on minimizing the squared cross-output-channel-correlation criterion. The simulation results show the effectiveness of the algorithm in the blind detection of DS-CDMA signals.

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“…Jo= 10loglo WJ -TL (10) where TL is the free-space transmission loss given by [10]: TL = 201og10 4,1 (11) For the carrier frequency f in GHz and R in miles, equation (1 1) becomes: TL = 96.6 + 20 log1o f + 20 loglo (R) (12) Jamming to signal power ratio for a remote source operating in L-band at range R miles emitting effective WJ watts may be written as [10]:…”

Section: Performance In the Presence Of Intentional Jammingmentioning

confidence: 99%

“…In a parallel acquisition mode, the detection stage simultaneously evaluates all the possible code offsets and picks the one with the highest correlation [11,12].…”

Section: Parallel Search Acquisitionmentioning

confidence: 99%

Time Acquisition Performance of PN Spread Spectrum Signal in the Presence of Intentional Jamming

Ahmed

Jabr²

2006 2nd International Conference on Information &Amp; Communication Technologies

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In this paper different acquisition methods were presented. Evaluation of a serial and parallel-search DS-SS, single and double dwell time acquisition system is given with and without incorporating an intentional jamming. The mean acquisition time is considered to be the performance measure of the receiver using a certain PN codes as spreading codes. The effects ofprobability of detection (PD), probability offalse alarm (PFA) and the threshold level (Vth) on the mean acquisition time also included.

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Parallel acquisition of PN sequences in DS/SS systems

Cited by 77 publications

References 6 publications

A High-Accuracy Frequency Estimation Approach Based on Segmental-FFT for Code Fast Acquisition

A High-Accuracy Frequency Estimation Approach Based on Segmental-FFT for Code Fast Acquisition

Multichannel Convolution Blind Separation Algorithm for MIMO DSSS/CDMA System

Time Acquisition Performance of PN Spread Spectrum Signal in the Presence of Intentional Jamming

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