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An FDD Wideband CDMA MAC Protocol For Wireless Multimedia Networks
White Papers Frequency Division Duplex (FDD) mode wideband CDMA does not have the option of multislot operation because the resource units only include codes in a frame. In order to enhance the flexibility of resource allocation in FDD mode wideband CDMA...
[July 25, 2004, 3:16]
Analysis Of Intersystem Handover: UMTS FDD & WLAN
White Papers This paper discusses the methods which have been proposed by the Third Generation Partnership Project (3GPP) in interworking Universal Mobile Telecommunication System(UMTS), using Frequency Division Duplex (FDD) transmission mode and Wireless...
[February 10, 2006, 0:01]
Tsunami Delivers A Tidal Wave Of Bandwidth: Tsunami FDD Vs 802.11 TDD Technology
White Papers This paper focuses on the two major radio technologies typically under consideration: Frequency Division Duplex (FDD), which is the technology underlying Tsunami Wireless Ethernet Bridges, and Time Division Duplex (TDD), which is typically used in...
[December 24, 2004, 2:00]
A Pragmatic Adaptive OFDM/FDD Cellular System In Frequency-Selective Fading Channels
White Papers This paper talks about an adaptive transmission scheme using QAM and LDPC code proposed for an OFDM cellular system employing FDD. By approximating the LLR distribution to a Gaussian distribution, only two parameters, the mean and the normalized...
[July 26, 2005, 6:00]
Spatial And Space-Time Algorithms For Synchronisation In The Downlink Of The UMTS FDD And TDD Modes
White Papers This paper presents methods for synchronisation in the downlink of the FDD and TDD modes of a UMTS system. Space-time processing based on multiple receive antennas is used to suppress co-channel interference caused by other base stations.
[July 26, 2005, 6:00]
Comparing SR Telecom's FDD-Based WiMAX Product With A TDD-Based WiMAX Product
White Papers This paper presents a comparison of SR Telecom's SYMMETRY frequency division duplex (FDD) WiMAX product that incorporates the optional features, such as diversity, space time coding (STC), and subchannelization, with another vendor time division...
[November 29, 2006, 7:15]
Influence Of The Common-Channel Power On The System Capacity Of UMTS FDD Systems That Use Beam Switching
White Papers This paper studies the influence of the power assigned to the common channels on the achievable capacity in UMTS FDD systems that use beam switching. In mobile communication systems using CDMA common channels needed for proper network operation...
[July 26, 2005, 6:00]
An FDD Wideband CDMA MAC Protocol With Minimum-Power Allocation And GPS Scheduling For Wireless Wide Area Multimedia Networks
White Papers In this paper, a Frequency Division Duplex (FDD) wideband Code Division Multiple Access (CDMA) Medium Access Control (MAC) protocol is developed for wireless wide area multimedia networks. In order to reach the maximum system capacity and guarantee...
[January 20, 2006, 0:01]
On Downlink Beamforming Techniques For TDMA/FDD Systems
White Papers The performance of three downlink beamforming techniques in a TDMA/FDD context is investigated in the present work. Two techniques based on the uplink processing are studied together with a decoupled space-time structure that provides the antenna...
[July 29, 2004, 3:00]
Tsunami FDD Vs 802.11 TDD Technology
White Papers This Technology Overview focuses on the two major radio technologies typically under consideration: Frequency Division Duplex (FDD), which is the technology underlying Tsunami Wireless Ethernet Bridges, and Time Division Duplex(TDD), which is...
[August 14, 2003, 16:19]
Asymmetric Traffic Management In UMTS FDD With Additional Downlink Spectrum
White Papers Asymmetric services with higher downlink traffic load are expected to dominate the service request to be supported by the forthcoming mobile communication systems like UMTS. The assignment of additional downlink spectrum for UMTS has been...
[July 19, 2005, 6:00]
Frequency Division Duplexing And Time Division Duplexing For Broadband Wireless Applications
White Papers With the advent of broadband wireless Internet access, discussions on Frequency Division Duplexing (FDD) versus Time Division Duplexing (TDD) have resurfaced. The first set of issues is related to the specifics of implementing an FDD system, the...
[March 2, 2004, 11:20]
Development Of Dual-Mode TD-SCDMA Node B
White Papers The key challenge was the development of a dual-mode, FDD and TD-SCDMA compliant Node B solution within a short timeframe. FSS provided its NBAP, ALCAP and SAAL-UNI protocol stacks, which were FDD compliant, for the Node B.
[September 5, 2007, 1:19]
Design Of A Multi-Sector Base Station Using The Fujitsu WiMAX SoC
White Papers Base stations use TDD or FDD techniques to communicate with subscriber stations. This paper briefly discusses the TDD and FDD mode reference designs for base stations by Fujitsu. The Fujitsu WiMAX 802.16-2004 baseband SoC is designed for the...
[November 23, 2005, 0:00]
The IEEE 802.16 Standard For Broadband Wireless Access
White Papers The duplexing scheme is either TDD or FDD. In the FDD case there is seamless support of half-duplex subscriber stations. The transmissions in the downlink direction are done in a TDM fashion, with the possibility of introducing re-synchronization...
[February 8, 2006, 0:01]
Orange Trials 3G Rival To WiMax
News In Britain, as in many other countries, the operators who won 3G licences were allocated two portions of 'paired bandwidth' called FDD, to be used for voice calls and data services (such as Vodafone's 3G Mobile Connect offering).
[March 31, 2005, 16:50]
Drowning In Wireless Spaghetti
News The first choice sees one frequency being used for different transmissions at different times — time domain duplex (TDD) — while the second is called frequency domain duplex (FDD). The first generation of mobile phone was based around FDD, with a...
[November 1, 2005, 12:00]
Global 3G Data Roaming Comes Closer
News In Britain, as in many other countries, the operators who won 3G licences were allocated two portions of 'paired bandwidth' called FDD (Frequency Division Duplex), to be used for voice calls and data services (such as Vodafone's 3G Mobile Connect...
[May 12, 2004, 18:15]
An Adaptive MIMO Transmission Technique For LDPC Coded OFDM Cellular Systems
White Papers In this paper, an adaptive MIMO transmission scheme using QAM and LDPC code is proposed for an OFDM cellular system employing FDD. By approximating the LLR distribution to a Gaussian distribution, only two parameters, the mean and the normalized...
[October 21, 2004, 3:00]
Direct Conversion Receiver For GSM900, DCS1800, PCS1900, And WCDMA
White Papers A single-chip, multi-mode direct conversion receiver designed for GSM900, DCS1800, PCS1900, and UTRA/FDD WCDMA, applications is described in this paper. The low-noise amplifier uses only four on-chip inductors.
[November 29, 2005, 0:00]
