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As the need for high speed connectivity in mobile environments increases, it becomes necessary to understand the impact of mobility on performance characteristics of wireless communication system. This paper presents an investigation of the mobility impact on performance of a WiMAX 802.16e downlink system deployed via Stratospheric platform for a ground user. It shows how user velocity and physical...
Worldwide interoperability for microwave access (WiMAX) is an IEEE802.16 standard that provides low cost, high-speed and long-range wireless communications, where the 802.16m is the latest version of WiMAX standard fully optimized for fixed and pedestrian speeds. Due to dynamic multipath fading and high Doppler shift, there is service degradation on quality of service (QoS) and data rate. In this...
In this paper, We extended our previous work of QR-RLS based MIMO(Multiple input Multiple output) channel estimation to Mobile Wimax 802.16m system. Mobile wimax system provides high data rate, also fulfills user's requirement like VOD(Video on demand)at very high vehicle speed and also provides better cell coverage area. Channel estimation is crucial part to achieve this goals especially in fast...
A lot of conventional algorithms have tried to cancel the residual frame synchronization error (RFSE), which causes the performance degradation of channel estimation when using interpolation between pilot sub-carriers in comb-type pilot-aided OFDM systems. Among them, a tracking method has been attractive to provide good performance by eliminating the effects of RFSE. However, it requires high computational...
The IEEE 802.16e mobile WiMAX system may not be quite suitable in some applications where the uplink (UL) requires higher transmission rate than the downlink (DL). In particular, many cases in military applications often require higher transmission rate in the uplink. In this paper, we propose a new mobile WiMAX scheme that provides the DL to UL ratio (DUR) to be 9:33 by modify the frame structure...
Recent mobile multimedia innovations evolved for the present society, is a mandatory requirement. To achieve this goal various forums have come forward with several design proposals to suit the group of applications in the Mobile multimedia networks (MMNs). In this regard, a new multi-protocol architecture for the medium access control is required to seamless mobile multimedia networking. Hence a...
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