Efficient Allocation Algorithms for Multicarrier Spread-Spectrum Schemes in UWB Applications

Stéphan, Antoine; Baudais, Jean-Yves; Hélard, Jean-François

doi:10.1109/icuwb.2007.4381006

Cited by 7 publications

(9 citation statements)

References 4 publications

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“…This spreading component improves the signal robustness against frequency selectivity and narrowband interference, since the signal bandwidth can become much larger than the coherence and interference bandwidths. Moreover, it increases the resource allocation flexibility as the spreading code dimension offers an additional degree of freedom [6]. We will assume that orthogonal spreading sequences are used in the proposed system.…”

Section: B Proposed Lp-ofdm Systemmentioning

confidence: 99%

MIMO UWB Systems Based on Linear Precoded OFDM for Home Gigabit Applications

Stéphan

Hélard

Uguen

2008

IEEE GLOBECOM 2008 - 2008 IEEE Global Telecommunications Conference

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Abstract-In this paper, we investigate the use of multipleinput multiple-output (MIMO) techniques with linear precoded orthogonal frequency division multiplexing (LP-OFDM) waveform for high data rate ultra-wideband (UWB) systems. This scheme is an evolution of the multiband OFDM (MB-OFDM) solution supported by the WiMedia Alliance. The aim of this paper is to obtain a very high data rate of around one gigabit for home access networks (HAN) and to improve the system range for lower data rates, while not significantly increasing the system complexity compared to the WiMedia solution. Firstly, a singleinput single-output (SISO) LP-OFDM system study is led to highlight the benefits of adding a precoding function to an OFDM signal in the UWB context. In an analytical study, different system choices and parameterization strategies are proposed in order to minimize the mean bit-error-rate (BER) and consequently improve the system range. Secondly, a MIMO scheme is added and global system simulations are performed on a proposed new geometric statistic MIMO channel model. We show that the proposed system can considerably improve the system range at low data rates, and can reach very high data rates up to 1 Gbit/s with comparable BER performances to WiMedia.

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Section: B Proposed Lp-ofdm Systemmentioning

confidence: 99%

MIMO UWB Systems Based on Linear Precoded OFDM for Home Gigabit Applications

Stéphan

Hélard

Uguen

2008

IEEE GLOBECOM 2008 - 2008 IEEE Global Telecommunications Conference

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“…To this date, most of the allocation studies that address the resource allocation issue in MB-OFDM systems do not take into consideration the quality of service (QoS) and the traffic differentiation matter in the multiuser environment. In [4] and [5] for example, resource allocation solutions are investigated but in the unique case of single-user MB-OFDM systems. On the other hand, the authors in [6] consider the multiuser context but without taking into consideration the users QoS requirements.…”

Section: Introductionmentioning

confidence: 99%

Multiuser Service Differentiated Spectrum Allocation Scheme for High Rate UWB Systems

Khalil

Crussière

Hélard

2010

2010 IEEE Wireless Communication and Networking Conference

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In this paper, we propose a multiuser spectrum allocation scheme for high-rate UWB systems under QoS requirements. This scheme comes as a solution to the coexistence of multiple users sharing the three sub-bands of the same channel as defined in the WiMedia solution adopted for multiband UWB systems. Indeed, WiMedia solution does not allow more than three users to coexist in the same channel. Based on a constrained multiuser optimization problem, the proposed allocation algorithm allows multiple users to access the medium following a mixed sub-band assignment and priority-based scheduling approach in order to ensure an efficient differentiated spectrum sharing. The resulting time-frequency scheduling algorithm relies on the combination of two main metrics available at PHY and MAC levels: the channel quality of each user provided by the exploitation of the effective SINR method, and the QoS constraint represented by a simple weighting parameter that differentiates between two service classes. Simulation results show the efficiency of the proposed scheme and how it guarantees a good performance level for users having strict QoS requirements.

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“…However, to this date, most research studies on multiband UWB systems have been devoted to the physical layer issues. In [4]- [6], the authors propose different sub-band and power allocation strategies based on the channel information without taking into account the users requirements and the quality of service issues. On the other hand, in [7], [8], the authors propose scheduling and power allocation algorithms that provide quality of service for multimedia applications in UWB systems but without having a full knowledge of the channel.…”

Section: Introductionmentioning

confidence: 99%

Multi-user cross-layer allocation design for LP-OFDM high data rate UWB systems

Khalil

Stéphan

Crussière

et al. 2008

2008 IEEE International Symposium on Wireless Communication Systems

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In this paper, we investigate a cross-layer design for the packet scheduling and the resource allocation in UWB systems. This design considers the combination of queuing and channel state information (CSI) which provides QoS support for multimedia applications in UWB. For the physical layer, the use of a linear precoded orthogonal division multiplexing (LP-OFDM) waveform is proposed because of its significant performance increase compared to the WiMedia proposal. For the medium access control layer, scheduling is performed in order to differentiate between the different users and to satisfy their quality of service constraints. This cross-layer approach optimizes the system spectral efficiency and solves the problem in the WiMedia solution of cohabitation of more than three users sharing the three sub-bands of the same channel. Simulation results show that the proposed scheme leads to a considerable improvement in resource allocation and can guarantee the required quality of service.

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Efficient Allocation Algorithms for Multicarrier Spread-Spectrum Schemes in UWB Applications

Cited by 7 publications

References 4 publications

MIMO UWB Systems Based on Linear Precoded OFDM for Home Gigabit Applications

MIMO UWB Systems Based on Linear Precoded OFDM for Home Gigabit Applications

Multiuser Service Differentiated Spectrum Allocation Scheme for High Rate UWB Systems

Multi-user cross-layer allocation design for LP-OFDM high data rate UWB systems

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