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In this paper, we investigate the performance of multiple-inputmultiple-output (MIMO) fading channels assisted by a reconfigurable intelligentsurface (RIS), through the employment of partition-based RIS schemes. Theproposed schemes are implemented without requiring any channel stateinformation knowledge at the transmitter side; this characteristic makes themattractive for practical applications. In particular, the RIS elements arepartitioned into sub-surfaces, which are periodically modified in an efficientway to assist the communication. Under this framework, we propose twolow-complexity partition-based schemes, where each sub-surface is adjusted byfollowing an amplitude-based or a phase-based approach. Specifically, theactivate-reflect (AR) scheme activates each sub-surface consecutively, bychanging the reflection amplitude of the corresponding elements. On the otherhand, the flip-reflect (FR) scheme adjusts periodically the phase shift of theelements at each sub-surface. Through the sequential reconfiguration of eachsub-surface, an equivalent parallel channel in the time domain is produced. Weanalyze the performance of each scheme in terms of outage probability andprovide expressions for the achieved diversity-multiplexing tradeoff. Ourresults show that the asymptotic performance of the considered network underthe partition-based schemes can be significantly enhanced in terms of diversitygain compared to the conventional case, where a single partition is considered.Moreover, the FR scheme always achieves the maximum multiplexing gain, whilefor the AR scheme this maximum gain can be achieved only under certainconditions with respect to the number of elements in each sub-surface.

Outage and DMT Analysis of Partition-based Schemes for RIS-aided MIMO Fading Channels