IRS will present a good candidate for 6G and future wireless networks channels.

1. INTELLIGENT REFLECTING
SURFACES (IRS)
The future wireless communication
Summarized by: Martin Wachiye, Graduate Member IEEE Kenya Section
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2. Introduction:
Active wall: a wall equiped with active
frequency selective surface used to control
the propagation environment.
Evolved active walls(Intelligent walls):
autonomous part of a smart indoor
environment for cognitive wireless networks.
Metasurfaces: 2D metamaterial that is
digitally controlled.
Elements of an IW:
- active FSS
- simple low-cost sensors
- cognitive engine with ML ability
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Some Common Definitions

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4. Motivation for LIS systems
1. Desire to control propagation environment to increase quality
of service (QoS) in wireless communication.
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The Need:

5. IRS Signal Model
yn = βne(jθn) xn, n = 1, · · · , N,
where
βn∈ [0, 1] is the reflection coefficient & control the
reflected signal’s amplitude (or attenuation due to
passive reflection)
θn∈ [0, 2π) is the phase shift
N is the total number of elements of the IRS.
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6. Architecture of IRS( Hardware)
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Active and passive elements. ( 3 layers & smart controller)