Walid M. Raafat

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Inter Cell Interference (ICI) still poses a real challenge that limits the Orthogonal Frequency Division Multiplexing Access (OFDMA) system performance, especially for users located at the cell edge. A common Inter Cell Interference Coordination (ICIC) technique is interference avoidance in which the allocation of the various system resources (e.g., time,(More)
The signals of LF and VLF are rapidly alternated by the earth's surface; and there are various propagation models currently used by the wireless industry for signal transmission within the frequency range 150-1800 MHz. Hata-Okumura two rays model are one of them. This paper addresses the problem of Inter Carrier Interference (ICI) arising from the Doppler(More)
This paper is a comparative study between the performances of conventional terrestrial multicell Multiple Input Multiple Output (MIMO) working in a Rayleigh fading environment and its corresponding High Altitude Platform (HAP) system working under a different Path Loss (PL) model with the capacity as the performance metric of interest, calculated using the(More)
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