International Workshop on Cross Layer Design, IWCLD
2007 International Workshop on Cross Layer Design
20-21 Sept. 2007
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The proceedings of this conference will be available for purchase through Curran Associates.
Cross Layer Design (IWCLD), 2007 International Workshop on
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Cross-layer Scheduling and Dynamic Resource Allocation for Downlink Multiuser MIMO Systems with Limited Feedback
Publication Year: 2007,Page(s):1 - 4
Cited by: Papers (3)
In this paper, we present a cross-layer scheduling and dynamic resource allocation (CLSDRA) strategy for downlink multiuser multiple-input multiple-output (MIMO) systems with limited feedback. Based on the instantaneous partial channel state information (CSI) from physical (PHY) layer and the queue state information (QSI) from media access control (MAC) layer, the proposed scheme schedules packets...Show More
A Two-Stage QoS Aware Scheduler for Wireless LANs Based on MIMO-OFDMA-SDMA Transmission
Andreas Konsgen;Waldemar Herdt;Hongyu Wang;Andreas Timm-Giel;Ronald Bohnke;Carmelita Gorg
Publication Year: 2007,Page(s):5 - 9
Cited by: Papers (3)
In this paper, a QoS-aware cross-layer scheduler for wireless LANs is introduced which can handle parallelised transmissions which are provided by OFDMA or SDMA. The scheduler includes two stages: in the hardware-independent stage, data flows are selected according to their QoS requirements such as throughput and delay. In the hardware-dependent stage, the channel resources are adaptively allocate...Show More
User Scheduling and Power Allocation for the Downlink of MIMO Systems Based on Limited Feedback
Publication Year: 2007,Page(s):10 - 13
Cited by: Papers (2)
In this paper, user scheduling and power allocation are invested for the downlink of MIMO systems with limited feedback, and the corresponding algorithms are proposed based on the idea of opportunistic multiple beamforming. The proposed user scheduling algorithm feeds the first and the second largest SINRs of each user and the indices of corresponding beams back to the base station only, while the...Show More
Multiple Antenna Gains in Low Complexity Cross-Layer Scheduling with Link Adaptation and QoS Requirements
Publication Year: 2007,Page(s):14 - 19
Traditional works rely on the use of complete Channel State Information (CSI) at the base station to take space-time scheduling decisions in the uplink of multi-user MIMO wireless systems. However, this might be a complex and costly solution. The simplest solutions are the random scheduler and the Round Robin (RR) scheduler that schedule terminals either randomly or sequentially without using CSI....Show More
The Capacity of Wireless Ad Hoc Networks with Power Control
Qiang Sun;Xianwen Zeng;Raihan Ur Rasool;Zongwu Ke;Niansheng Chen
Publication Year: 2007,Page(s):20 - 24
Cited by: Papers (2)
Power control is an efficient way to save energy in wireless ad hoc networks. However, as the size of networks grows, the losing from using smaller nodal transmit power may exceed the benefit from it. In this paper, the impact of power control on wireless ad hoc network capacity is discussed. An ad hoc network with n nodes which are uniformly distributed in 2-dimensional space with density p and e...Show More
Use of Side Information to Improve Energy Consumption in IR-UWB Wireless Sensor Networks
Sanam Moghaddamnia;M. Dolores Perez Guirao;Zhao Zhao;Klaus Jobmann;Thomas Kaiser
Publication Year: 2007,Page(s):25 - 28
Sensor nodes are mostly battery-powered and in many cases it is impractical to recharge their battery, thus energy saving is of critical importance in the design of protocols for wireless sensor networks. Wakeup schemes that switch off sensors radio when communication is not necessary have great potential in energy saving. This paper proposes the integration of side information available at sensor...Show More
Energy-Balanced Solution for Cluster-Based Wireless Sensor Networks with Mixed Communication Modes
Publication Year: 2007,Page(s):29 - 32
Cited by: Papers (9)
This paper considers a cluster-based WSNs, which is partitioned into a number of voronoi cells. For a voronoi cell, the paper presents an energy-balance transmission approach to balance the energy dissipation, by adjusting the ratio of data transmitted to the next hop and the cluster head directly. Simulations show that the network lifetime by this transmission approach extends about 1.5 times of ...Show More
A Distributed Virtual MIMO Scheme Using Cross Layer Design for Wireless Sensor Networks
Publication Year: 2007,Page(s):33 - 36
In this paper, we propose a novel distributed virtual MIMO scheme for wireless sensor networks. Using the cross layer design, which involves the MIMO techniques on the physical layer and directed diffusion protocol on the network layer, the scheme can optimize the network's energy performance. Comparing with the exiting cluster-based virtual MIMO scheme, the proposed distributed scheme has better ...Show More
Outage Probability Analysis for Cognitive Radios with Reception Diversity
Publication Year: 2007,Page(s):37 - 40
Cited by: Papers (3)
Outage probability for cognitive radios is investigated in this paper. The scenario under consideration requires the cognitive radio to sense whether the primary user (PU) link is free (or exists a spectrum hole) before making an active transmission using that link. The use of multiple antennas at the cognitive receiver provides array gains at the sensing stage. We derive a closed-form outage prob...Show More
Throughput Analysis of Cognitive MIMO System
Hui Huang;Zhaoyang Zhang;Peng Cheng;Guanding Yu;Peiliang Qiu
Publication Year: 2007,Page(s):45 - 49
Cited by: Papers (6)
In this paper, we consider a simple cognitive MIMO system, in which the cognitive link communicates using two transmission antennas and one receiving antenna. In order to ensure the primary link's transmission unaffected, the cognitive user has to detect the activity of the primary link, and transmit when it senses an idle slot. The maximum stable throughput of the cognitive link in this scenario ...Show More
Cross-Layer Design for MIMO Correlated Nakagami Fading Channels
Publication Year: 2007,Page(s):50 - 54
Cited by: Papers (5)
In this paper, we investigate the effect that fading correlation has on the average spectral efficiency (ASE) of the cross-layer system, combining of adaptive modulation (AM) and truncated automatic repeat request (T-ARQ) in the presence of STBC transmit diversity on Nakgami-m fading channels. We deduce the closed-form expressions for the ASE and average packet error rate (APER) of this STBC cross...Show More
Link Layer Abstraction in MIMO-OFDM System
Publication Year: 2007,Page(s):41 - 44
Cited by: Papers (48)
Link layer abstraction is crucial to the cross-layer simulation and design as the interface. EESM and MIESM are two kinds of algorithms which account for the instantaneous channel realization and other configurations and obtain the estimated packet error rate correspondingly. Enhanced versions of the algorithms with weighted training are brought out in this paper, which have shown great improvemen...Show More
A Self-Adaptive Bandwidth Reservation Scheme for 4G Mobile WiMAX
Chenn-Jung Huang;Yi-Ta Chuang;Chih-Tai Guan;Dian-Xiu Yang;You-Jia Chen
Publication Year: 2007,Page(s):55 - 59
Cited by: Papers (4)
Many mechanisms based on bandwidth reservation have been proposed in the literature to decrease connection dropping probability for handoffs in cellular communications. The handoff events occur at a much higher rate in packet-switched 4G mobile WiMAX networks than in traditional cellular systems. In this paper, a self-adaptive bandwidth reservation schemes, which adopts a probabilistic mobility pr...Show More
Optimal Delay-Power Tradeoff in Wireless Transmission with Fixed Modulation
Publication Year: 2007,Page(s):60 - 64
Cited by: Papers (32)
Cross-layer scheduling is an emerging and powerful solution that can significantly improve the quality of service (QoS) and power efficiency in wireless networks by jointly using channel and buffer states to adjust transmission power and rate. In conventional scheduling methods, adaptive modulation and coding (AMQ) is adopted to realize rate adaptation. However, this may greatly increase the trans...Show More
Resource Allocation for OFDMA System Based on Genetic Algorithm
Publication Year: 2007,Page(s):65 - 69
Cited by: Papers (8)
In traditional resource allocation for OFDMA, the packet scheduling and subcarriers allocation are optimized independently. In order to improve the whole system performance, a resource allocation algorithm based on genetic algorithm was proposed, in which the packet scheduling and subcarriers allocation are optimized jointly. To maximize system throughput and guarantee fairness among users, the pr...Show More
A novel cross-layer scheduling algorithm for IEEE 802.16 WMAN
Publication Year: 2007,Page(s):70 - 73
Cited by: Papers (7)
In this paper, we propose a novel cross layer scheduling strategy for IEEE 802.16 WMAN. The proposed scheduler will first guarantee all the prescribed QoS requirements, then take into account different wireless channel conditions obtained by subscriber stations to enhance the system throughput while it ensures the property of the fairness per connection. The performance of our scheduler is evaluat...Show More
User Selection for Maximum Sum-rate in Multi-user and MISO System with Evolutionary Algorithm
Mingyan Jiang;Francisco Rubio;Yong Wang;Jesus Gomez;Dongfeng Yuan
Publication Year: 2007,Page(s):74 - 77
In this paper, departing from perfect knowledge on the channel state information at the base station transmitter, we introduce a novel evolutionary algorithm that is based upon the principles of natural evolution and allows for an optimum mobile user selection in a multi-user multiple-input single-output (MISO) system. The algorithm achieves the maximum sum-rate for given degrees of spatial multip...Show More
Cross-layer Resource Allocation for the Downlink of SDMA Systems
Publication Year: 2007,Page(s):78 - 81
Cited by: Patents (1)
In this paper, we study the resource allocation problem for the downlink of spatial-division multiple-access (SDMA) systems. We develop a general architecture to determine the optimal subset of users and their transmission rates. The constraints posed by the physical layer (in terms of spatial orthogonality) and by the link layer (in terms of QoS requirements) are jointly taken into consideration....Show More
Weighted Sum Rate Maximization for the MIMO-Downlink Using a Projected Conjugate Gradient Algorithm
Publication Year: 2007,Page(s):82 - 85
The maximization of a weighted sum of data rates is an essential point in cross-layer based resource allocation. Several algorithms have been proposed in the literature to solve this problem for the downlink of a multiple antenna system employing dirty paper preceding at the base station. However, they all suffer from a relatively slow convergence if the true number of objective function evaluatio...Show More
Utility Maximization Strategies in the Multi-User MIMO Downlink
Publication Year: 2007,Page(s):86 - 90
Cited by: Papers (2)
The problem of maximizing utility over the capacity region of the MIMO broadcast channel is addressed. While a direct solution is not possible, it is discussed how decomposition techniques can be used to find an optimum solution. Two decompositions are considered: A standard dual decomposition and a gradient projection-based decomposition.Show More
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The proceedings of this conference will be available for purchase through Curran Associates.
Cross Layer Design (IWCLD), 2007 International Workshop on
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