Post by Shannon Wireless

In this paper, the authors propose a #holographic #multiple-#input #multiple-#output (#HMIMO) communication system based on a pair of #stacked #intelligent #metasurfaces (#SIM) at the transmitter (#TX) and receiver (#RX), respectively. In sharp contrast to conventional #MIMO designs, SIM is capable of automatically accomplishing #transmit #precoding and #receiver #combining as the #electromagnetic (#EM) waves propagate through them. As such, each #spatial #stream can be directly radiated and recovered from the corresponding transmit and receive port. Secondly, they formulate the problem of minimizing the error between the actual #end-#to-#end #channel #matrix and the target diagonal one, representing a flawless interference-free system of parallel #subchannels. This is achieved by jointly optimizing the #phase #shifts associated with all the metasurface layers of both the TX-SIM and RX-SIM. They then design a #gradient #descent #algorithm to solve the resultant #non-#convex problem. Furthermore, they theoretically analyze the HMIMO #channel #capacity #bound and provide some fundamental insights. ---- Jiancheng An; Chao Xu; Derrick Wing Kwan Ng; George C. Alexandropoulos; Chongwen Huang; Chau Yuen More details can be found at this link: https://lnkd.in/gbhUSNQB