19 Resources for

ofdma

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An OFDM-TDMA/SA MAC Protocol With QoS Constraints for Broadband Wireless LANs: Orthogonal Frequency Division Multiplexing OFDM is an important technique to support high speed transmission of broadband traffic in wireless networks, especially broadband wireless Local Area Networks LANs. Based on OFDM, a new multiple access scheme, called OFDM-TDMA with subcarrier allocation (OFDMTDMA/ SA), is introduced in this paper. It provides more...; Tags: QoS, Broadband Wireless, Broadband, WLAN, OFDMA, Broadband Internet, OFDM, Network Technology, Telecommunications, LANs, Wireless, Networking; White papers
ofdma: i want to know about recent issues related to ofdma; Tags: priti_ldce@..., OFDMA; Discussion threads 2007-09-05
Joint Congestion Control and OFDMA Scheduling for Hybrid Wireline-Wireless Networks: This paper considers joint congestion control and multiuser scheduling in a hybrid wireline and wireless network, where the air interface of wireless links is based on Orthogonal Frequency Division Multiplexing OFDM. For static channels, the paper formulates this cross-layer design as a Network Utility Maximization NUM problem with both wireline...; Tags: Congestion, University Of Minnesota, OFDMA, OFDM, Wi-Fi, Wireless; White papers 2006-12-13
Optimal Scheduling for OFDMA Systems: This paper considers a scheduling and resource allocation problem for the downlink of an OFDMA-based wireless network, where the channel estimation error is modeled by a self-noise term in the decoding process. During each time-slot this involves selecting a subset of users for transmission, determining the assignment of available subcarriers...; Tags: Algorithm, Paper, Princeton University, OFDMA, Engineering; White papers 2006-11-24
Delay Analysis and Comparison of OFDM-TDMA and OFDMA Under IEEE 802.16 QoS Framework: The delay analysis and comparison of OFDM-TDMA and OFDMA using a flow control scheme under the QoS framework of IEEE 802.16 are conducted in the work discussed in this paper. The paper investigates the maximum packet delay performance by deriving delay bounds for several multiaccess modes with different subcarrier/time-slot assignment...; Tags: University Of Southern California, Performance, Allocation, IEEE 802.16, Scheme, Analysis, OFDMA, WiMAX, Performance Management, Wireless, Human Resources, Workforce Management; White papers 2006-07-22

Comparison and Cost Analysis of Smart and Opportunistic MIMO OFDM Schemes: This paper attempts to compare the system downlink performance of a smart antenna scheme for OFDMA that utilizes channel covariance information with an opportunistic multi-antenna scheme for OFDMA that uses fast limited feedback of the instantaneous channel condition. The schemes are evaluated by means of simulations in a low load...; Tags: Scheme, Analysis, OFDMA, Antenna Method, Performance Management, Human Resources, Workforce Management; White papers 2006-02-10
Performance Analysis of a Reuse Partitioning Technique for OFDM Based Evolved UTRA: The current 3GPP working assumption on the Evolved Universal Terrestrial Radio Access (E-UTRA) physical layer is that it will be based on Single Carrier Frequency Division Multiple Access (SC-FDMA) for the uplink and Orthogonal Frequency Division Multiple Access OFDMA for the downlink. According to the concept specification, inter-cell interference mitigation...; Tags: Technique, Performance, OFDMA, OFDM, Productivity; White papers 2006-02-01
Resource Allocation in OFDMA Wireless Networks With Time-Varying Arrivals: This paper considers the issue of optimal subcarrier allocation in OFDMA wireless networks when the arrivals and channels are stochastic and time-varying. The objective is to minimize the long-term average packet delay over multiple time epochs. This paper shows by example that water-filling-based subcarrier allocation policy which maximizes throughput at...; Tags: Allocation, OFDMA; White papers 2005-11-14
On the Error Performance of Sectorized Cellular Systems for MC-CDMA and OFDMA: This paper addresses downlink systems based on Orthogonal Frequency Division Multiplexing OFDM. The systems are situated in a sectorized cellular structure whereas the cellular environment model takes into account path loss and shadowing depending on the position of the mobile terminal. The paper investigates and compares the error performances in...; Tags: Performance, OFDMA, OFDM, Performance Management, Wireless, Human Resources, Workforce Management; White papers 2005-06-07
MC-CDMA Versus OFDMA in Cellular Environments: In this paper, two candidates for a next generation (4G) downlink system in a multi-cell environment are studied in respect to their error performance. The paper investigates on the one hand, an Orthogonal Frequency Division Multiplexing OFDM based Multiple Access scheme OFDMA, and on the other hand, a Multi-Carrier Code...; Tags: Environment, OFDMA; White papers 2005-04-14
Innovations in Wireless Broadband Technologies: This paper presents innovations related to the use of OFDM/OFDMA in IEEE 802.16 as well as ETSI HiperMAN standards. The paper addresses the last innovations in standards, related to channel estimation in high delay-spread environments, carrier allocation for optimal cell range extension and better frequency reuse when using OFDMA, SNR...; Tags: Innovation, Alvarion Ltd., Broadband, OFDMA, Wireless Broadband, Leadership, OFDM, Strategy, Wireless, Management; White papers 2004-12-08
Rate Stable Resource Allocation in OFDM Systems: From Water-Filling to Queue-Balancing: This paper considers the issue of optimal subcarrier allocation in OFDMA. The authors show, via a counter example, that water-filling based subcarrier allocation policies, contrary to conventional wisdom, fail to provide rate-stability for an otherwise stabilizable OFDMA system. Water-filling is too myopic when considering longtime average performance, e.g. delay, queue...; Tags: Allocation, OFDMA, OFDM; White papers 2004-12-05
A Fresh Look at Optimal Subcarrier Allocation in OFDMA Systems: This paper considers the issue of optimal subcarrier allocation in OFDMA. This paper shows, via a counter example, that water-filling based subcarrier allocation policies, contrary to conventional wisdom, fail to provide rate-stability for an otherwise stabilizable OFDMA system. Water-filling is too myopic when considering long-time average performance, e.g. delay, queue...; Tags: Allocation, OFDMA; White papers 2004-09-09
Capacity Analysis on Downlink MIMO OFDMA Systems: Motivated by the increasing popularity of OFDMA and MIMO, this paper studies the capacity of MIMO enabled OFDMA system under a generic multiuser multicarrier framework. This paper shows that in terms of total system capacity, OFDMA is the optimal downlink scheme for independent decoding receivers. To achieve the capacity bound...; Tags: Allocation, Analysis, OFDMA; White papers 2004-08-24
Scalable OFDMA Physical Layer in IEEE 802.16 WirelessMAN: The concept of scalability was introduced to the IEEE 802.16 WirelessMAN Orthogonal Frequency Division Multiplexing Access OFDMA mode by the 802.16 Task Group e TGe. A scalable physical layer enables standard-based solutions to deliver optimum performance in channel bandwidths ranging from 1.25 MHz to 20 MHz with fixed subcarrier spacing...; Tags: IEEE 802.16, Architecture, OFDMA, WiMAX, Wireless; White papers 2004-08-20
IEEE 802.16 Medium Access Control and Service Provisioning: This paper describes the IEEE 802.16 Orthogonal Frequency Division Multiplexing OFDM and the 802.16 Orthogonal Frequency Division Multiple Access OFDMA, Medium Access Control MAC protocols, both of which are key elements of the Worldwide Interoperability for Microwave Access Forum WiMAX deployments. The paper also discusses the types of provisioning and...; Tags: IEEE 802.16, Service Provisioning, OFDMA, WiMAX, Wireless, Wi-Fi; White papers 2004-08-20
On the Optimality of the OFDMA Network: This paper studies the optimality of the OFDMA network. It is proved that in the multiuser multicarrier downlink system with independent decoding, OFDMA is the optimal multiple access scheme. It is also shown that the optimality of OFDMA holds for any adaptive modulation scheme whose Rate-SNR/SINR function can be approximated...; Tags: OFDMA; White papers 2004-07-15
On the Capacity of the Broadband Relay Networks: The paper studies the capacity of the OFDM and the OFDMA relay networks. Two relay schemes, amplify-and-forward AF relay and decode-and-forward DF relay are analyzed and compared for both OFDM and OFDMA relay networks. A relay node selection algorithm is proposed for OFDMA relay network. Numerical results show that under...; Tags: Network, Broadband, OFDMA, Relay Node Selection Algorithm, OFDM, Wireless; White papers 2004-06-09
Downlink Radio Resource Allocation for Multi-Cell OFDMA System: Orthogonal frequency division multiple access OFDMA provides a feasible broadband platform where different forms of multiuser diversities (e.g., mutual interference, selective fading channels and bursty traffics) can be efficiently exploited. This paper presents a radio resource control RRC scheme for OFDMA systems where dynamic resource allocation is realized at both...; Tags: Radio, Allocation, OFDMA; White papers 2003-12-21

Additional Resources

On Performance of SCH-OFDMA-CDM in Frequency Selective Indoor Environment: Performance of Sub Carrier Hopped Orthogonal Frequency Division Multiple Access Code Division Multiplexing (SCH-OFDMA-CDM) is analyzed and compared against its non hopping counterpart (OFDMA-CDM) in frequency selective indoor environment. The system model is developed and simulation results for realistic scenarios are presented. These provide guidelines for configuring the system and...; Tags: Performance, Environment, Scheme, Performance Management, Human Resources, Workforce Management; White papers

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