Self-encoded spread spectrum modulation with differential encoding

Kong, Yan; Nguyen, Lim; Jang, Won Mee

doi:10.1109/isssta.2002.1048586

Cited by 20 publications

(16 citation statements)

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“…Here we assume no self-interference that is negligible anyway at high signal-to-noise ratio (SNR) as shown in Figure 2. Self-interference effect because of incorrectly detected data bits at the receiver can also be removed with differential encoding [6]. Self-interference can be completely disregarded especially with 20 repetition codes as in GPS [7].…”

Section: Power Spectral Density (Psd) Of Sess M-sequence and Gold Codementioning

confidence: 99%

Timing accuracy of self-encoded spread spectrum navigation with communication

Jang

2011

IET Radar Sonar Navig.

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Section: Power Spectral Density (Psd) Of Sess M-sequence and Gold Codementioning

confidence: 99%

Timing accuracy of self-encoded spread spectrum navigation with communication

Jang

2011

IET Radar Sonar Navig.

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“…is the particular SSP sequence of [9]. In order to despread the SSP signal at the receiver, we consider two solutions.…”

Section: A Spreading Sequence Generation In Sspmentioning

confidence: 99%

“…In fact, the despreading sequence must be computed at the receiver from past detected bits and error propagation in the despreading process can severely degrade performance. In order to alleviate error propagation, differential encoding has been considered in [9], while the integration of SSP and coding has been investigated in [10], where only hard decoded bits are used for despreading.…”

Section: Introductionmentioning

confidence: 99%

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Generalized self spread-spectrum communications with turbo soft despreading and decoding

Tomasin

Veronesi

2006

J. Commun. Netw.

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Self-spreading (SSP) is a spread spectrum technique where the spreading sequence is generated from data bits. Although SSP allows communications with low probability of interception by unintended receivers, despreading by the intended receiver is prone to error propagation. In this paper, we propose both a new transmitter and a new receiver based on SSP with the aim to a) reduce error propagation and b) increase the concealment of the transmission. We first describe a new technique for the generation of SSP spreading sequence, which generalizes SSPs of existing literature. We include also coding at the transmitter, in order to further reduce the effects of error propagation at the receiver. For the receiver, we propose a turbo architecture based on the exchange of information between a soft despreader and a softinput soft-output decoder. We design the despreader in order to fully exploit the information provided by the decoder. Lastly, we propose a chip decoder that extracts the information on data bits contained in the spreading sequence from the received signal. The performance of the proposed scheme is evaluated and compared with existing spread-spectrum systems.Index Terms: Low probability of interception, self spread spectrum, turbo despreader.

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“…At the receiver, the feedback demodulator performs the reverse operation for symbol recovery by means of a correlation detector. The differential encoder and decoder serve to mitigate the effect of error propagation [2].…”

Section: Introductionmentioning

confidence: 99%

Pre-filtering of self-encoded spread spectrum in dense multipath channels

Jang

Nguyen

2009

2009 3rd International Conference on Signal Processing and Communication Systems

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Abstract-We present pre-filtering methods of self-encoded spread spectrum (SESS) in dense multipath channels. SESS eliminates the need for traditional transmit and receive pseudo noise (PN) code generators. In this paper, we propose multipath management of SESS in dense multipath urban environments. We propose a transmitter pre-filtering method that retains only good paths that contribute to the data decision positively at the receiver, and eliminates undesirable paths. The proposed technique significantly improves the system performance while increasing the transmit power moderately. Index Terms -multipath, pre-filter, self-encoded spread spectrum.

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Self-encoded spread spectrum modulation with differential encoding

Cited by 20 publications

References 0 publications

Timing accuracy of self-encoded spread spectrum navigation with communication

Timing accuracy of self-encoded spread spectrum navigation with communication

Generalized self spread-spectrum communications with turbo soft despreading and decoding

Pre-filtering of self-encoded spread spectrum in dense multipath channels

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