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This paper investigates two performance metrics, namely ergodic capacity and symbol error rate, of mmWave communication system assisted by a reconfigurable intelligent surface (RIS). We assume independent and identically distributed (i.i.d.) Rician fadings between user-RIS-Access Point (AP), with RIS surface consisting of passive reflecting elements. First, we derive a new unified closed-form formula for the average symbol error probability of generalised 𝑀-QAM/𝑀-PSK signalling over this mmWave link. We then obtain new closed-form expressions for the ergodic capacity with and without channel state information (CSI) at the AP.

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Transmit diversity generally requires more than one antenna at the transmitter. But many wireless devices are limited by size or hardware complexity to one antenna. Recently, a new class of methods called cooperative communication has been proposed that enables single-antenna mobiles in multi-user environment to share their antennas and form a virtual multipleantenna transmitter that allow them to achieve transmit diversity. However, most of proposed methods require distributed space -time coding algorithms which is very critical. We propose a method that provides transmit diversity gain on the order of the number of relays in the network. Our scheme first selects the best relay from a set of M available relays then uses this "Best" relay for cooperation between the transmitter and the receiver. The selection of best relay is not required any topology information and is based on local measurements of the instantaneous channel conditions. The theoretic analysis of outage probability shows that our scheme achieves the same diversity-multiplexing tradeoff as achieved by more complex protocols, where distributed spacetime coding for M relays is required.

“A people's relationship to their heritage is the same as the relationship of a child to its mother.” - John Henrik Clarke Across the globe there is an urgent concern to conserve, preserve, and present the heritage in as pious a form as possible. Governments all over are making discrete or mutual efforts to interpret, aware, sensitize, and educate the citizens with the heritage. It has been observed that globally the alarm has begun about how to safely transmit the legacy of yesteryears to the future generations to come. Broadly speaking, heritage is not yours or not mine...it's everyone's, and for everyone. Considering this in mind, major steps have been taken time to time educate and sensitize about one's heritage. These steps sometimes were structured but mostly instructed leading to non-impactful results. This chapter deals with the ideas, ideologies, concepts, schemes, and initiatives undertaken at various levels across globe to Edu-liaison Heritage.

<div>In this correspondence, we correct the ergodic capacity versus SNR curves of the coherent multiple-input</div><div>multiple-output (MIMO) channel in independent and identically distributed (IID) Rayleigh fading in the correspondence cited in the title. More importantly, the corrected capacity results present an interesting and compelling contrast between performances of the coherent MIMO systems with and without channel state information at the transmitter; whereas this view is somewhat limited in in the correspondence cited in the title because of flaws in the capacity curves.</div>

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