An OFDM-CDMA Scheme for High Data Rate UWB Applications

Guéguen, Emeric; Crussière, Matthieu; Hélard, Jean-François

doi:10.1109/vetecs.2007.596

Cited by 10 publications

(6 citation statements)

References 7 publications

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“…Additionally, each realization of the channel model related to each user is generated independently and assumed to be time invariant during the transmission of a frame. We simulated the MMSE spectral efficiency using the CM1UWB channel model where the parameters are presented in Table 2 [24] which is presented in Figure 5.…”

Section: Resultsmentioning

confidence: 99%

Asymptotic Design and Analysis of Multiuser Detector for UWB High Data Rate Channel Based on Channel Division Multiple Access

Chihi¹,

Bouallègue²

2013

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In this paper, we study an innovative multiple access scheme that exploits the intrinsic properties of the wireless environment to improve the multiuser environment, so-called Channel Division Multiple Access (ChDMA) focusing on spectral efficiency analysis and system performance. In particular, we show that Simultaneous multiuser accessing to a common destination is made possible by considering the channel impulse response (CIR) of each user as a signature. We begin by the assumption of the channel state information available at the receiver. Then, we analyze the performance of the ChDMA integration in a random environment over UWB high data rate channel. Next, we discuss the design of MMSE and optimal receiver structure for such a system. Additionally, we show an asymptotic analysis behavior taking into account the channel eigenvalues distribution with the associated spectral efficiency.

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Section: Resultsmentioning

confidence: 99%

Asymptotic Design and Analysis of Multiuser Detector for UWB High Data Rate Channel Based on Channel Division Multiple Access

Chihi¹,

Bouallègue²

2013

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“…In practice, however, for wideband systems, it is desirable to design the precoders such that a per-subcarrier power constraint, i.e. the power spectrum density constraint, is satisfied [25], [26].…”

Section: A Related Work and Motivationsmentioning

confidence: 99%

Hybrid Beamforming/Combining for Millimeter Wave MIMO: A Machine Learning Approach

Chen

Feng

Xing

et al. 2020

IEEE Trans. Veh. Technol.

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Hybrid analog/digital processing is crucial for millimeter-wave (mmWave) MIMO systems, due to its ability to balance the gain and cost. Despite fruitful recent studies, the optimal beamforming/combining method remains unknown for a practical multiuser, broadband mmWave MIMO equipped with low-resolution phase shifters and low-resolution analog-to-digital converters (ADCs).In this paper, we leverage artificial intelligence techniques to tackle this problem. Particularly, we propose a neural hybrid beamforming/combining (NHB) MIMO system, where the various types of hybrid analog/digital mmWave MIMO systems are transformed into a corresponding autoencoder (AE) based neural networks. Consequently, the digital and analog beamformers/combiners are obtained by training the AE based new model in an unsupervised learning manner, regardless of particular configurations. Using this approach, we can apply amachine learning-based design methodology that is compatible with a range of different beamforming/combing architectures. We also propose an iterative training strategy for the neural network parameter updating, which can effective guarantee fast convergence of the established NHB model. According to simulation results, the proposed NHB can offer a significant performance gain over existing methods in term of bit

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“…In frequency domain analysis we have the CFR of each user expressed as: = ∑ If we substitute (2) in (6) we obtain: Y = H T ZP F H X q +Ne (7) Then, in reception the dispreading task is achieved by H H matrix yields (7) is given by:…”

Section: A System Modelmentioning

confidence: 99%

“…In [7] authors investigate a sub-block subdivision to ameliorate the simultaneous access. Authors in [8] propose a combination between MB-UWB system features with Code Division Multiple Accesses (CDMA).…”

Section: Introductionmentioning

confidence: 99%

Channel Division Multiple Access analysis in MBOFDM UWB high data rate system

Chihi

Bouallègue

Lacerda

2014

2014 International Wireless Communications and Mobile Computing Conference (IWCMC)

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International audienceIn this contribution we study the challenging issue of WiMedia solution which the ability to support high data rate applications but is limited to three piconets simultaneously communicating in the same area. For this reason we analyze the suitability of Channel Division Multiple Access (ChDMA) approach for Multiband Orthogonal Frequency Division Multiplexing (MBOFDM) Ultra Wide Band (UWB) (MB-UWB) system over IEEE 802.15.3a (UWB) channel model. ChDMA approach exploits the characteristics of MB-UWB system to separate the piconets. Each piconet employs its own Channel Frequency Response (CFR) as a signature code which introduces diversity. We have presented analytical analysis in terms of spectral efficiency (bits/s/Hz) assuming that the receiver knows the channel. Numerical analysis is run over IEEE 802.15.3a high data rate channel justified the importance of ChDMA solution to improve the spectral efficiency of MB-UWB system. Then, performance evaluation is investigated when minimum mean square error (MMSE) and matched filter (MF) receiver is applied. Simulations results show the importance of MMSE receiver to improve the performance of MB-UWB ChDMA system

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An OFDM-CDMA Scheme for High Data Rate UWB Applications

Cited by 10 publications

References 7 publications

Asymptotic Design and Analysis of Multiuser Detector for UWB High Data Rate Channel Based on Channel Division Multiple Access

Asymptotic Design and Analysis of Multiuser Detector for UWB High Data Rate Channel Based on Channel Division Multiple Access

Hybrid Beamforming/Combining for Millimeter Wave MIMO: A Machine Learning Approach

Channel Division Multiple Access analysis in MBOFDM UWB high data rate system

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