Antenna And Frequency Diversity Improvement In Mimo Wimax Technology
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Date
2011-08
Authors
Kadhim, Mohammed Aboud
Journal Title
Journal ISSN
Volume Title
Publisher
Universiti Sains Malaysia
Abstract
Diversity is an influential communication technique that combats fading by
exploiting the random nature of the wireless channel and finding independent signal
paths between the transmitter and the receiver. In WiMAX PHY, diversity
techniques such as time diversity, frequency diversity and antenna diversity are used
to improve performance. The main objectives of this thesis are to improve diversity
performance in WiMAX PHY. The first step is to modify the existing design and
implement the PIFA antenna arrays for mobile handset application, exploiting
antenna diversity in MIMO WiMAX mobile applications. The second step is the
design and implementation of MIMO WiMAX (IEEE802.16.d) OSTBC-OFDM
based wavelet and multiwavelet baseband transceiver applied to a multi-core
software-defined radio platform for improved frequency diversity. A modified PIFA
(Planar Inverted-F Antenna) design and its array were proposed and studied at 3.5
GHz. The unique PIFA with a small-size ground plane forms a self-composed
structure and there are no connection losses when connecting to the ground plane and
the top plate. The ground and top plates are made from the same copper plate,
twisted in the specified dimensions. The ground plane, as small as the antenna, is
situated between the PIFA and the PCB so that the PCB is no longer acting as a
ground plane for the PIFA. The two PIFA modules and the four PIFA modules fixed
on the PCB do not share the same ground plane.
Description
Keywords
Antenna And Frequency , Mimo Wimax Technology