(Frequency Division Multiple Access) The technology used in the analog cellular telephone network that divides the spectrum into 30 kHz channels. See TDMA, CDMA and CDPD.
 | Reproduced with permission from Computer Desktop Encyclopedia. Copyright (c) 1981-2008 The Computer Language Company Inc. All rights reserved. |
Additional Resources
- 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...
- White papers 2006-02-01
- An Opportunistic Downlink MIMO-OFDM Scheme
- This paper presents an opportunistic Multiple-Input Multiple-Output MIMO scheme that achieves increased throughput of multi-user downlink transmission in frequency-selective channels. Developed for OFDM systems, the main idea of the proposed scheme is to find the optimal subset of users for each subchannel and optimal transmit beamforming vector which would maximize...
- White papers 2006-01-17
- Adaptive Scheduling for Heterogeneous Traffic Flows in Cellular Wireless OFDM-FDMA Systems
- This paper studies the performance gain achieved by introducing dynamic subcarrier scheduling schemes to OFDM systems in the presence of heterogeneous traffic streams. Dynamic subcarrier scheduling copes with channel state variation by dynamically assigning different subcarriers to terminals, e.g. in the downlink of a cellular system. In addition to the...
- White papers 2005-03-11
- Analysis of the Effects of Related Parameters on Capacity of CDMA Systems
- Using the CDMA systems in satellite communications especially in LEO satellites is rapidly growing. This is due to advantage of spread spectrum techniques used in CDMA systems and their higher capacity in compare to FDMA and TDMA systems. Calculation of capacity in CDMA is usually done with the consideration of...
- White papers 2005-02-12
- On the Effect of Inband Signaling and Realistic Channel Knowledge on Dynamic OFDM-FDMA Systems
- Dynamically assigning subcarriers of OFDM systems to multiple different terminals in a cell has been shown to be beneficial in terms of different transmission metrics. However, the success of such a scheme depends on the ability of the access point to inform terminals of their newest subcarrier assignments as well...
- White papers
- Cross-Layer Optimization of OFDM Transmission Systems for MPEG-4 Video Streaming
- This paper studies the performance of a combined link- and physical-layer approach for the downlink of a dynamic OFDM-FDMA transmission system delivering MPEG-4 video streams. The approach consists of three different mechanisms - queue management, resource allocation, and subcarrier assignment - which can be used separately as well as in...
- White papers
- 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...
- White papers
- Space Division Multiple Access (SDMA) for Robust Ad Hoc Vehicle Communication Networks
- This paper proposes a novel robust and self-organizing architecture for mobile ad hoc networks. The proposed architecture, Space Division Multiple Access SDMA, relies on user position information and provides users access to the communication channel based on their spatial locations. SDMA divides the geographical space, where the users are located,...
- White papers
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