Third generation mobile radio systems will employ TD-CDMA in their TDD mode. In a TD-CDMA mobile radio system, joint-detection is equivalent to solving a least squares problem with a system matrix that exhibits some form of block-Toeplitz structure. This structure can be successfully exploited by using variations of the Schur algorithm for computing the QR decomposition of this system matrix. T...

In the fourth-generation (4G) mobile communication system, all communications including realtime communications is expected to be carried by packets multiplexed on a shared radio channel to improve the radio resource efficiency. Because the delay characteristics and the throughput of a packet radio channel vary greatly with changes in both traffic volume and radio channel quality, NTT DoCoMo pr...

The general packet radio service (GPRS), a data extension of the mobile telephony standard GSM is emerging as the ®rst true packet-switched architecture to allow mobile subscribers to bene®t from high-speed transmission rates and run data applications from their mobile terminals. A high-level description of the GPRS system is given with emphasis on services and architectural aspects. Ó 2000 Els...

Memory disturbances are a frequent outcome of brain damages. Maintenance or enhancement of the patients’ life quality requires an enormous effort of caregivers or family members. To support patients with brain injuries the mobile distributed care system named MEMOS (Mobile Extensible Memory System) was designed, implemented and tested in the daycare clinic for cognitive neurology at Leipzig Uni...

considering the pace of scientific, technological and cultural developments, one will have no other choice but to learn over a lifetime. mobile learning as a new stage of e-learning development with the potential of using mobile devices, is supposed to be an effective means for lifelong learning. therefore, the purpose of this survey was to analyze the problems of agricultural education system ...

Ad hoc network is a collection of wireless mobile nodes that dynamically form a temporary network without the use of any existing network infrastructure or centralized administration. A cognitive radio is a radio that can change its transmitter parameters based on interaction with the environment in which it operates. The basic idea of cognitive radio networks is that the unlicensed devices (co...

Android is a very popular system in Chinese mobile phone market, while radio frequency identification device (RFID) which is originally used in fields of retail and logistics etc., is going to be installed into Android to realize the visualization of commodity information (including the updating, discounting, and after-sale service) and the general use for publics. This study firstly discussed ...