Personal area technologies for internetworked services

Williams, C.; Beach, M.A.; Neirynck, Dries; Nix, Andrew R; Chen, K.; Morris, Kevin; Kitchener, D.; Presser, Mirko; Li, Yuchan; McLaughlin, Stephen

doi:10.1109/mcom.2004.1367554

Cited by 8 publications

(5 citation statements)

References 5 publications

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“…We also evidenced a relationship between fluctuation amplitudes, sequence lengths and the number of users transmitting at the same data rate. It allowed one to determine the number of user groups transmitting at the same data rate and thus to distinguish one standard from others as previously suggested in [10]. As proposed in [2], [3], the number of users within a group can be found through the synchronization process.…”

Section: Discussionmentioning

confidence: 99%

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SPC11-2: Blind Multiuser Detection in Multirate CDMA Transmissions Using Fluctuations of Correlation Estimators

Nzeza¹,

Gautier²,

Burel³

2006

IEEE Globecom 2006

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This paper deals with the problem of blind multiuser detection in multirate direct-sequence code division multiple access (DS-CDMA). Direct-Sequence Spread Spectrum (DS-SS) signals are well-known for their low probability of interception: their statistics are similar to those of a noise; furthermore, they are usually transmitted below the noise level. Here, the method based on the fluctuations of autocorrelation estimators, previously described in a single user context [1], is extended to multiusers. From the variable spreading length technique, we will evidence an increase of these periodical fluctuations and, on average, a relationship between their peak amplitudes and sequence lengths. A theoretical analysis will show that detection is possible, even with a very low signal-to-noise ratio (SNR) at the detector input. This approach will be illustrated with experimental results. The assessment of symbol periods allows one to start the synchronization process proposed recently in [2], [3], which also permits the determination of the number of interfering users in each group of users transmitting at the same symbol period, thus, conversely at the same data rate.

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Section: Discussionmentioning

confidence: 99%

“…This method should also allow a blind multi-standard detection through a differentiation of various standards based on an analysis of their set of available data rates [10].…”

Section: Introductionmentioning

confidence: 99%

SPC11-2: Blind Multiuser Detection in Multirate CDMA Transmissions Using Fluctuations of Correlation Estimators

Nzeza¹,

Gautier²,

Burel³

2006

IEEE Globecom 2006

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“…This assumption is considered to be valid even in the presence of people in the channel. Furthermore, results reported in [9] show that the coherence time of the channel is greater than 1 ms.…”

Section: Indoor Measurement Setup and Environmentmentioning

confidence: 94%

Spatial and Temporal Variation of Wideband Indoor Channels

Ndzi

Savage

Grémont

2010

International Journal of Antennas and Propagation

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Extensive studies of the impact of temporal variations induced by people on the characteristics of indoor wideband channels are reported. Singular Value Decomposition Prony algorithm has been used to compute the impulse response from measured channel transfer functions. The high multipath resolution of the algorithm has allowed a detailed assessment of the shapes of individual multipath clusters and their variation in time and space in indoor channels. Large- and small-scale analyses show that there is a significant dependency of the channel response on room size. The presence of people in the channel has been found to induce both signal enhancements and fading with short-term dynamic variations of up to 30 dB, depending on the number of people and their positions within the room. A joint amplitude and time of arrival model has been used to successfully model measured impulse response clusters.

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“…Besides, it allows a multi-standard detection through a differentiation of various standards data rate as suggested in (Williams et al, 2004). Successive investigations of the contributions of noise and channel-corrupted signal through the analysis of the second-order moment of the correlation estimator computed from many randomly-selected analysis windows constitutes the key point of the proposed temporal parameters estimation approach.…”

Section: Multiuser Multirate Signal Modelmentioning

confidence: 99%

Blind Detection, Parameters Estimation and Despreading of DS-CDMA Signals in Multirate Multiuser Cognitive Radio Systems

Nzeza¹,

Gautier²

2012

Advances in Cognitive Radio Systems

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Personal area technologies for internetworked services

Abstract: General rightsThis document is made available in accordance with publisher policies. Please cite only the published version using the reference above. Full terms of use are available: http://www.bristol.ac.uk/pure/about/ebr-terms IEEE Radio Communications • December 2004 S15

Cited by 8 publications

References 5 publications

SPC11-2: Blind Multiuser Detection in Multirate CDMA Transmissions Using Fluctuations of Correlation Estimators

SPC11-2: Blind Multiuser Detection in Multirate CDMA Transmissions Using Fluctuations of Correlation Estimators

Spatial and Temporal Variation of Wideband Indoor Channels

Blind Detection, Parameters Estimation and Despreading of DS-CDMA Signals in Multirate Multiuser Cognitive Radio Systems

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