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Fourth generation mobile systems and services will mainly be characterized by a horizontal communication model, where different access technologies such as cellular, cordless, wireless local area network, short-range connectivity, and wired systems will be combined on a common platform to complement each other optimally for different service requirements and radio environments. To access different...
A new design for maximizing the data rate of the multiband orthogonal frequency division multiplexing ultra wideband systems is presented. The design is based on the generation of a series of M-ary quadrature amplitude modulation zones for each UWB subcarrier whose levels of fading depend on the UWB channel model. The available transmitted power is then optimally distributed to use the modulation...
This paper presents transmission parameters of Unmanned Vehicle Robot (UVR) systems based on IEEE802.16e (M-WiMAX) systems. UVR requires higher uplink multimedia data rate, which is different from commercial M-WiMAX system. This paper designes some parameters satisfying the UVR system requirements and demonstrates performance evaluation based on the parameters. For the transmission parameters, the...
This paper presents a joint adaptive modulation and coding (AMC) scheme, which exploits the coherence bandwidth of the wireless channel to divide the transmitted frame into independent sub-channels that correspond to the channel coherence bandwidth. This strategy is implemented for orthogonal frequency division multiplexing (OFDM) systems with channel state information (CSI) feedback. Low density...
Directed selected mapping (dSLM) is a well known peak-to-average power ratio (PAPR) reduction scheme for multiple-input multiple-output (MIMO) orthogonal frequency division multiplexing (OFDM) systems. Although such technique provides an extremely effective PAPR reduction, the receiver has not been previously considered in previous research under the assumption of no side information. The transmission...
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