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space division multiple access

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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,...; Tags: Advertisement, Network, Division, Architecture, University Of California, Space Division Multiple Access, Cellular Phones, Networking, Consumer Electronics, Personal Technology; White papers

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Wideband Code Division Multiple Access: To satisfy ever-increasing demands for higher data rates, as well as to allow more users to simultaneously access the network, interest has peaked in what has come to be known as wideband code division multiple access WCDMA. This paper discusses those basic characteristics of WCDMA waveforms that make them attractive...; Tags: W-CDMA, Cellular Phones, Consumer Electronics, Personal Technology; White papers 2000-08-01
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
Slow Subcarrier-Hopped Space Division Multiple Access OFDM Systems: Space Division Multiple Access SDMA assisted Multi-Input-Multi-Output MIMO OFDM systems invoking Multi-User Detection MUD techniques have attracted substantial research interests, which are capable of exploiting both transmitter multiplexing gain and receiver diversity gain. Furthermore, the classic Frequency-Hopping FH technique can be effectively amalgamated with SDMA-OFDM systems, resulting in Frequency-Hopped FH...; Tags: Technique, Microsoft Access, Diversity, OFDM, Productivity, Wireless; White papers 2005-03-18
Wideband Code Division Multiple Access (W–CDMA): Wideband code division multiple access (W–CDMA) is a CDMA channel that is four times wider than the current channels that are typically used in 2G networks in North America.European Telecommunications Standards Institute ETSI decided to choose the W–CDMA technology to be the multiple access techniques for the third-generation mobile telephone...; Tags: W-CDMA, Mobile, CDMA, Cellular Phones, Consumer Electronics, Personal Technology; White papers

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
An MMSE Multiuser Detector for Space-Time Block Coded OFDM: This paper proposes a multiuser detection MUD scheme for space-time block coded orthogonal frequency division multiplexing (STBC-OFDM) systems. The optimum weight matrix used to decouple simultaneously signals from active multiple access users is derived using the minimum mean square error MMSE multiuser detection method. The proposed scheme provides good performance...; Tags: OFDM, Wireless; White papers 2005-01-01
Configuring DOCSIS 2.0 A-TDMA Modulation Profiles: This paper describes the DOCSIS 2.0 A-TDMA services feature, which provides support for DOCSIS 2.0 Advanced Time Division Multiple Access (A-TDMA) upstream modulation profiles on the Cisco uBR-MC16U/X, Cisco uBR-MC28U/X, and Cisco uBR-MC5X20S/U Broadband Processing Engine BPE cable interface line cards. This feature supplements the existing support for DOCSIS 1.0...; Tags: DOCSIS, Cisco Systems Inc., Modulation, Cable, Broadband Internet, Telecommunications, Personal Technology; White papers 2004-03-01
Noncoherent Space-Frequency Coded MIMO-OFDM: Recently, the use of coherent space-frequency coding in orthogonal frequency division multiplexing OFDM-based frequency-selective multiple-input multiple-output MIMO antenna fading channels has been proposed. Acquiring knowledge of the fading coefficients in a MIMO channel is already very challenging in the frequency-flat fast fading case. In the frequency-selective case, this task becomes...; Tags: Channel, MIMO, IEEE, MIMO-OFDM, OFDM, Wireless; White papers 2005-02-14
Space-Time/Frequency Coding for MIMO-OFDM in Next Generation Broadband Wireless Systems: With the advent of the next generation (4G) broadband wireless communications, the combination of Multiple-Input Multiple-Output MIMO wireless technology with Orthogonal Frequency Division Multiplexing OFDM has been recognized as one of the most promising techniques to support high data rate and high performance. In particular, coding over the space, time...; Tags: Broadband Wireless, Broadband, MIMO-OFDM, Broadband Internet, Telecommunications, Wireless; White papers 2007-03-17
RAKE Receiver: RAKE receiver is used in CDMA-based Code Division Multiple Access systems and can combine multipath components, which are time-delayed versions of the original signal transmission. Combining is done in order to improve the signal to noise ration at the receiver. RAKE receiver attempts to collect the time-shifted versions of the...; Tags: W-CDMA, TeliaSonera, CDMA, Cellular Phones, Consumer Electronics, Personal Technology; White papers 2004-12-07
Reduced Complexity Blind Layered Space-Time Equalization for MIMO OFDM Systems: This paper proposes reduced complexity blind Layered Space-Time Equalization LSTE for Multiple-Input Multiple-Output MIMO Orthogonal Frequency Division Multiplexing OFDM. Blind Source Separation BSS combined with a Vertical Bell Laboratories Layered Space-Time (V-BLAST) scheme is used in a small portion of subcarriers to perform blind signal detection and channel estimation iteratively....; Tags: Layered Technologies Inc., MIMO-OFDM, OFDM, Wireless; White papers 2005-08-27
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
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
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
Performance Analysis of MIMO NLOS OFDM Broadband Fixed Wireless Access Systems: The combination of Multiple Input Multiple Output MIMO techniques and Orthogonal Frequency Division Multiplexing OFDM modulation, two powerful technologies in the physical layer design, represents a promising means to provide high-data-rate and high-quality wireless access in presence of Non Line Of Sight NLOS propagation. This paper focuses on performance evaluation...; Tags: Performance, MIMO, Wireless Access, Wi-Fi, Wireless; White papers 2005-12-14
Low-Complexity Performance Optimization for MIMO CDMA Systems: A low-complexity approach is proposed for optimizing the performance of a multiple input multiple-output MIMO direct sequence code division multiple-access (DS-CDMA) system in the uplink for frequency selective fading channels. Each user transmits a weighted form of its symbols through its multiple antennas, and a receive antenna array at the...; Tags: Optimization, MIMO, IEEE; White papers 2005-04-27
The Performance of OFDM-SDMA Systems With Power Amplifier Non-Linearities: Amplifier nonlinearities affect drastically the performance of Orthogonal Frequency Domain Multiplexing OFDM systems. In this paper, the effects of amplifier nonlinearities is evaluated in OFDM with Space-Division-Multiple-Access SDMA.This paper shows that nonlinear power amplifier reduced dramatically the performance of multiple-antennas OFDM systems. The introduction of an array antenna system in...; Tags: Performance, Amplifier, Mobile Communication, OFDM, Performance Management, Cellular Phones, Wireless, Human Resources, Workforce Management, Consumer Electronics, Personal Technology; White papers 2005-08-25
On the Peak-to-Average Power Ratio of Pre-Equalized Multi-Carrier Code-Division Multiple-Access Transmissions: Recently, pre-equalization for Multi-Carrier Code-Division Multiple-Access (MC-CDMA) systems has attained increased interest. In addition, combined-equalization has been proposed to further enhance the error rate performance of conventional MC-CDMA systems. However, an important issue, Peak-to-Average Power Ratio PAPR, has not been addressed within such systems in the literature. The purpose of...; Tags: Performance Management, Human Resources, Workforce Management; White papers 2005-05-29
A Space-Time FIR Equalizer Training Algorithm for MIMO-OFDM Systems: This paper proposes several new direct training-based methods for FIR space-time equalizer design in Multiple-Input Multiple-Output Orthogonal Frequency Division Multiplexing (MIMO-OFDM) systems employing spatial multiplexing. This paper proposes a two-stage receiver structure consisting of an initial space-time equalization for suppressing the Co-Channel Interference CCI, shortening the channel, and mitigating asynchronicity...; Tags: Algorithm, Training, MIMO-OFDM, Workforce Management, Human Resources; White papers 2004-10-27

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