mobile system downlink
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Proposal of Adaptive Downlink Modulation Using OFDM and MC-CDMA for Future Mobile Communications System
White Paper In this paper, an adaptive downlink modulation using OFDM and MC-CDMA is presented for maximizing the system capacity and actualizing QoS (Quality of Service) control of future mobile communications. To meet the strong demand for broadband... [10 Apr 2008]
Enterprise Applications: Key Considerations for Selecting and Deploying Wireless Corporate Applications
White Paper The GSM (Global System for Mobile communications) family of technologies including: GPRS (General Packet Radio Services); EDGE (Enhanced Data rates for Global Evolution); UMTS (Universal Mobile Telecommunications System) and HSDPA (High Speed... [16 Feb 2006]
Comparison of Space-Time Block Coding and Cyclic Delay Diversity for a Broadband Mobile Radio Air Interface
White Paper In this paper, two different types of Space-Time Block Codes (STBC) are applied in the downlink of a broadband mobile radio air interface based on MCCDMA, which is a promising candidate for a 4th generation mobile radio system. [16 Feb 2006]
Comparison of Time Slot Allocation Strategies for CDMA/TDD Systems
White Paper The traffic (load) asymmetry between uplink and downlink is a remarkable traffic characteristic in cellular mobile multimedia communications. The Code Division Multiple Access system with Time Division Duplex mode (CDMA/TDD system), adopting... [10 Nov 2006]
Cell Search in W-CDMA
White Paper In a CDMA cellular system, the process of the mobile station searching for a cell and achieving code and time synchronization to its downlink scrambling code is referred to as cell search. Cell search is performed in three scenarios: initial cell... [10 Nov 2006]
Interference Considerations for the Time Division Duplex Mode of the UMTS Terrestrial Radio Access
White Paper Since both uplink and downlink share the same frequency in TDD, the signals of the two transmission directions can interfere with each other. The air interface of the Universal Mobile Telecommunication System (UMTS) Terrestrial Radio Access (UTRA... [19 Jan 2006]
Link-Adaptation-Enhanced Dynamic Channel Allocation for MIMO-OFDM Wireless Networks
White Paper This paper proposes a link-adaptation (LA)-based system infrastructure and develops the corresponding dynamic channel allocation (DCA) algorithm for downlink data transmissions over MIMO-OFDM wireless networks. [28 Mar 2005]
Successive Interference Cancellation Algorithms for Downlink W-CDMA Communications
White Paper Three new interference cancellation techniques suitable for the downlink of any CDMA system with orthogonal spreading are proposed. In this paper, successive intracell interference cancellation (IIC) of the wideband-code division multiple access (W... [10 Apr 2008]
Adaptive Array Antenna for W-CDMA Systems
White Paper This paper describes an integrated AAA system for W-CDMA that consists of both uplink and downlink beam formers. The adaptive array antenna (AAA) is one of the advanced techniques that will be implemented in the IMT-2000 mobile telecommunications... [24 Jul 2004]
A Generalized Performance Study of DS-CDMA Uplink/Downlink Receivers in Nakagami Wideband Fading Channel
White Paper The performance of two uplink/downlink receivers in Nakagami wideband fading channel is studied. This paper considers a mobile system consisting of a single isolated circular cell with K independent users simultaneously sharing the channel using... [07 Feb 2006]
On Pilot-Symbol Aided Channel Estimation for MC-CDMA in the Presence of Cellular Interference
White Paper This paper addresses the downlink of a cellular Multi-Carrier CDMA (MC-CDMA) system taking into account channel estimation. The system performance in presence of a synchronization mismatch between two interfering Base Stations (BS) is analysed in... [16 Feb 2006]
Analysis of Cellular Interference for MC-CDMA and Its Impact on Channel Estimation
White Paper This paper addresses the downlink of a cellular Multi-Carrier CDMA (MC-CDMA) system taking into account channel estimation. The system performance in presence of a synchronization mismatch between two interfering Base Stations (BS) is analyzed in... [16 Feb 2006]
Countermeasures for Reducing the Influence of Frequency Offsets on Uplink MC-CDMA
White Paper With TDD mode the effects of the channel on the uplink signal can be pre-compensated at the mobile station, based on the channel estimation from the downlink frame. The introduced countermeasures show how by proper frequency interleaving and... [16 Feb 2006]
Adaptive Multilevel Coding in OFDM Systems
White Paper Orthogonal Frequency Division Multiplexing (OFDM) is considered the leading candidate for high data rate transmissions of 4-th generation mobile systems, especially in downlink. The performance of the suggested system is analyzed. [11 Apr 2007]
Dynamic Bandwidth Allocation for Multimedia Traffic With Rate Guarantee and Fair Access in WCDMA Systems
White Paper In this work, three new downlink scheduling algorithms for a WCDMA base station are proposed to support multimedia transmissions. Using a credit management and a compensation mechanism, the algorithms provide rate guarantee and fair access to... [11 Jul 2008]
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