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News Raising the example of Korea, he noted the availability of models which combine both HSDPA (high-speed downlink packet access) and WiBro (wireless broadband) functionality. LTE is touted as the successor to the existing UMTS (Universal Mobile...
[11 Apr 2008]
whitepaper 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]
whitepaper 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]
News There are now 637 high speed downlink packet access products on the market, with almost half (303) of them being mobile phones. The number of 3.5G devices on the market is mushrooming with 150 per cent annual growth in HSDPA gizmos, according to...
[07 Apr 2008]
News Data throughput in the MoonLite system would range from up to 3kbps for the downlink and up to 2kbps for the uplink. After conquering the farthest corners of the globe, mobile phones are now destined for the final frontier - space.
[19 Feb 2008]
whitepaper Caching frequently accessed data by mobile clients can conserve wireless bandwidth and battery power, at the expense of some system resources to maintain cache consistency. Providing on-demand data access in client-server wireless networks is an...
[23 Aug 2007]
whitepaper 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]
whitepaper 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]
whitepaper 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]
News The downlink backhaul — the basic connection which then feeds into the onboard wi-fi network — relies on a roof-mounted satellite connection and a 3G/GPRS uplink is provided via a mobile phone antenna, although spectrum was recently made available...
[27 Oct 2006]
News According to Qinetiq Rail, the system will be able to provide a connection of up to 49Mbps for trains travelling up to 200kmph, although satellite downlink will be around 20Mbps. Rail company Southern is also testing the tech on its services with...
[29 Jun 2006]
whitepaper In this paper, the downlink of a MultiUser Spatial Multiplexing (MUSM) communication system is investigated where antenna arrays are used at both the Base Transceiver Station (BTS) and at K mobile users.
[17 May 2006]
whitepaper 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]
whitepaper 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]
whitepaper 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]
whitepaper 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]
whitepaper 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]
whitepaper Both burdens can be answered in the downlink by precoding the signal with the knowledge of the channel state information. The possible complexity in the hardware of the mobile terminal is another major limitation.
[16 Feb 2006]
whitepaper 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...
[16 Feb 2006]
whitepaper 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]
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