(Orthogonal Frequency Division Multiple Access) A cellular air interface based on OFDM for multiple, simultaneous users. The multiuser capability is achieved by assigning each user a subset of OFDM subcarriers (see OFDM). Used in communications networks such as WiMAX and LTE, OFDMA is expected to provide air interfaces that are superior to CDMA and TDMA. See WiMAX, LTE, CDMA and TDMA.
 | Reproduced with permission from Computer Desktop Encyclopedia. Copyright (c) 1981-2009 The Computer Language Company Inc. All rights reserved. |
Additional Resources
- Access Service Network Gateway in WiMAX
- The high data rate demand for applications such as real-time audio, video, online gaming, service on demand, and live conference has always kept challenges way ahead of available technical dexterity. WiMAX with very high data rate and huge spectral radius along with OFDMA based IP technology is well equipped to...
- White papers 2009-08-01
- WiMAX Base Station Scheduling Algorithms
- This white paper discusses about the scheduling algorithms for Orthogonal Frequency Division Multiple Access/Time Division Multiple Access (OFDMA/TDMA) based systems, which extends the PF scheme to multiple service types with diverse QoS requirements. Worldwide Interoperability for Microwave Access WiMAX is one of the most important broadband wireless technologies and is...
- White papers 2009-07-01
- Mobile WiMAX Performance Improvement Using a Novel Algorithm With a New Form of Adaptive Modulation
- Worldwide Interoperability for Microwave Access WiMAX is an emerging broadband wireless technology that promises high-speed data services. Mobile WiMAX is a broadband wireless solution that enables convergence of mobile and fixed broadband networks through a common wide area broadband radio access technology and flexible network architecture. Mobile WiMAX is based...
- White papers 2009-02-01
- QoS Provisioning and Radio Resource Allocation in OFDMA Based WiMAX Systems
- Broadband Wireless Access based on the IEEE 802.16 suite of standards is quickly gaining importance as the basis for 4G technology, with the capability of providing high data rate QoS provisioned services for static as well as highly mobile users. Amongst the different PHY layers in the specification, Orthogonal Frequency...
- White papers 2009-01-01
- The Business of WiMAX: Impact of Technology, Architecture & Spectrum on the WiMAX Business Case
- The advent of next generation, wireless broadband platforms pairing performance with favorable economics is ushering in a new age of unprecedented connectivity in communities across a diverse range of global markets. Mobile WiMAX, based on the IEEE 802.16e-2005 global standard, leads the evolution roadmap with market ready solutions leveraging the...
- White papers 2008-11-11
- Inside Mobile WiMAX Technology
- This paper presents an overview of mobile WiMAX technology and discusses the key role of spectrum analysis for ensuring reliable systems' operation and deployment. Mobile WiMAX Worldwide Interoperability for Microwave Access-IEEE-802.16e-2005 standard is a 'last mile' IP based broadband wireless solution that enables convergence of mobile and fixed broadband networks...
- White papers 2008-10-29
- WiMAX Downlink OFDMA Burst Placement for Optimized Receiver Duty-Cycling
- Mobile wireless broadband access networks are now becoming a reality, thanks to the emerging IEEE 802.16e standard. This kind of network offers different challenges when compared to the fixed ones, as power consumption becomes a major concern. In this standard, a strict organization of the downlink bursts is not guaranteed...
- White papers 2008-10-16
- WiMax - the technology, devices and momentum - finally arrives.
- WiMax - the technology, devices and momentum - finally arrives.Great NewsI've been reading a of articles about wimax and the buzz is all the same...excitement. This is evidence enough for me that it's time to buy a new laptop :)No information?Coverage where? Fixed or Mobile? Reception distance?ANSWERS:Coverage...
- Discussion threads 2008-10-09
- Adaptive TUF Packet Scheduling Scheme for OFDMA-Based WiMAX Systems
- WiMAX is a well-known broadband wireless access technology to support for different users in multimedia transmission. Its physical layer can be employed with Orthogonal Frequency-Division Multiple Access OFDMA technology. IEEE 802.16e has evolved five scheduling types of Quality of Service QoS for uplink transmission, but has not yet clearly defined...
- White papers 2008-09-20
- WiMAX Relay Networks: Opportunistic Scheduling to Exploit Multiuser Diversity and Frequency Selectivity
- The paper studies the problem of scheduling in OFDMA-based relay networks with emphasis on IEEE 802.16j based WiMAX relay networks. In such networks, in addition to a base station, multiple relay stations are used for enhancing the throughput, and/or improving the range of the base station. The paper solves the...
- White papers 2008-09-19
- Hardware Link Level Emulator for System Level Simulations of WiMAX-Like Systems
- This paper describes the Hardware Link Level Emulator HLLE developed for hardware acceleration of the system level simulations of the WiMAX-like OFDM and OFDMA systems. The proposed architecture of the HLLE including transmit pipeline, channel emulator, receive pipeline and control blocks is presented. The performance characteristics of the developed HLLE...
- White papers 2008-06-25
- Deploying Mobile WiMAX Networks
- WiMAX, the Worldwide Interoperability for Microwave Access, is described by the WiMAX Forum as "A standards-based technology enabling the delivery of last mile wireless broadband access as an alternative to cable and DSL". WiMAX is designed to provide wireless service with higher data rate, longer range, more efficient use of...
- White papers 2008-06-13
- Inter-Cell Interference Management in WiMAX Downlinks by a Stackelberg Game Between BSs
- A game theoretic framework is developed for effective and adaptive inter-cell interference management in the OFDMA-based WiMAX/3GPP-LTE systems. Such approach requires no fixed spectrum planning beforehand and does not affect the spectrum usage for users that are not subject to inter-cell interference. Based on the handoff mechanisms in WiMAX systems,...
- White papers 2008-05-27
- WiMAX Forum Position Paper for WiMAX Technology in the 700 MHz Band
- Even though WiMAX systems based on OFDMA employ the most advanced technology in terms of modulation schemes and advanced antenna systems, cell ranges are constrained by physical propagation characteristics in the aforementioned frequency bands. This is not an issue in high population service regions with high capacity demand where smaller...
- White papers 2008-03-01
- WiMAX and WiFi Together: Deployment Models and User Scenarios
- The integration of WiFi into notebooks has accelerated the adoption of WiFi to the point where it is nearly a default feature in notebooks. Over 97% of laptops ship with WiFi integrated, and an increasing number of handhelds and Consumer Electronics CE devices are adding WiFi capabilities. This paper explores...
- White papers 2007-11-19
- The Access Service Network in WiMAX: The Role of ASN-GW
- Fourth-generation networks will emerge from open IP-OFDMA based architecture model to enable horizontal system integration from best suppliers. A different variety of base stations are connected to access gateway to meet the extended coverage with high speeds and end-to-end throughput and all traffic run through these gateways. Emergence of OFDMA...
- White papers 2007-10-29
- Multi-User Frequency Domain Scheduling for WiMAX OFDMA
- This paper introduces the performance analysis of 802.16e OFDMA system in UL mode with respect to multi-user scheduling algorithms in frequency domain. Different scheduling algorithms - from the simplest round robin to the optimal iterative scheduling, along with practical maximum element and two-step algorithms are analyzed and compared. It is...
- White papers 2007-08-29
- WiMAX and IMT-2000
- The inclusion of mobile WiMAX under the IMT-2000 umbrella will offer significant benefits to the mobile community by assuring the global delivery of Wireless Broadband Internet services at the lowest cost. Mobile WiMAX is based upon Orthogonal Frequency Division Multiple Access OFDMA, an access technology standardized in the IEEE 802.16e-2005...
- White papers 2007-01-22
- 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...
- 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...
- White papers 2006-11-24
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