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موجز عن البحث:
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In this paper, we propose a new wireless
communication transmission architecture called Switched phasedarray (SPA), to
enhance physical layer security. SPA works as a platform for three different
transmission techniques: (1) conventional phased-array transmission, (2)
Antenna Subset transmission (AST) technique, and (3) Silent Antenna Hopping
(SAH) transmission technique. SPA consists of a conventional phased-array
transmitter followed by antennas with an on-off switching circuit. The
proposed solution maintains the objective of scrambling the constellation
points in both amplitude and phase in undesired directions, while preserving
a clear constellation in the target direction. The proposed solution – SPA –
is different from previously-used methods in the following ways: (1) SPA is
not restricted to the use of phase modulation, and can accept any modulation
type including QAM, (2) it does not need to modulate the signal in the Radio
Frequency (RF) domain, where the conventional phased-array transmitter
circuits remain unchanged, (3) in the far field, SPA scrambles the signal
constellation by randomly switching-off some of the transmitting antennas
(AST), or only one of them (SAH), (4) SPA can be easily integrated with the
current infrastructure of phased-array transmitters, (5) SPA breaks up the
correlation between the data rates and the switching speed, and (6) SPA
performs a variety of DM transmission techniques. We present the potential
transmission techniques including PA, AST, and SAH.We analyze the performance
for all cases and derive an exact expression of the bit error probability,
and we analyze the secrecy capacity. The results show that SPA, and its
variants AST and SAH, are simple and very efficient solutions to improve the
physical layer security of mm-wave communication.
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ملخص المشاركة:
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Cognitive radio technology promises to be a solution
to the shortage and misuse of frequency spectrum. As a result the previous
decade has witnessed a significant amount of research and the principle of
artificial intelligence has been expanded to cover the whole network and its
components rather than the radio devices. Sensing the primary user and
distinguishing it from the white noise and other secondary users are the main
problems that the research attempts to tackle, in addition to trying to find
commercial applications to help cognitive radio technology to flourish.
Finally, the expected effects of this technology on the future of
telecommunications field are amazing, because the efficiency of the network
will be improved dramatically, which means more wireless services with higher
speeds and wider storage capacity as well as increasing the reliability and
stability of the wide area networks.
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ملخص المشاركة:
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Spatial Modulation (SM) has recently received much
attention since it can achieve a spatial multiplexing gain while avoiding the
conventional Multi-input-multi-output (MIMO) limitations such as
inter-channel interference (ICI), inter-antenna synchronization (IAS) and
multiple radio frequency (RF) chains. The space shift keying (SSK) is a
special case of SM. In SSK, only the antenna indices are used to convey the
information. Therefore, the complexity of the receiver is reduced compared to
the conventional SM which leads to reduce the cost of transceiver. The main
contributions in this paper are: 1) we propose three different methods in
order to analyse the performance of the space shift keying modulation, 2) the
numerical calculations are used to validate that all the three methods leads
to the same results, and 3) we prove that the simulation results agree with
the theoretical analysis. The significant reduction in complexity, without
affecting the SM performance gain, suggests SSK as a viable solution for the
next generation of wireless communication.
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