On the Degrees of Freedom of IRS-Assisted Non-Coherent MIMO Communications
Author's Department
Electronics & Communications Engineering Department
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https://doi.org/10.1109/lcomm.2022.3153556
Document Type
Research Article
Publication Title
IEEE Communications Letters
Publication Date
5-1-2022
doi
10.1109/lcomm.2022.3153556
Abstract
In this letter, we consider the problem of intelligent reflecting surfaces (IRS) assisted non-coherent MIMO communications. The transmitter employs non-coherent MIMO codes and we allow the IRS to send its own information by switching the phases of some/all of its reflecting elements. We prove that the phase-modulated information from the IRS is completely transparent to the non-coherent MIMO transmitter and receiver, with no need for any performance provisioning or even knowing that the IRS is transmitting data. Moreover, we characterize the achievable degrees of freedom of the proposed transmission scheme gained by allowing the IRS to send extra data. We show that although non-coherent communications do not require channel estimates at the receiver, IRSs can still be used to enhance performance as more energy can be geared towards the receiver, although no co-phasing is done in our case. Moreover, the IRS can increase the achievable degrees of freedom of the system without requiring any extra power at the IRS.
First Page
1175
Last Page
1179
Recommended Citation
APA Citation
Seddik, K.
(2022). On the Degrees of Freedom of IRS-Assisted Non-Coherent MIMO Communications. IEEE Communications Letters, 26(5), 1175–1179.
10.1109/lcomm.2022.3153556
https://fount.aucegypt.edu/faculty_journal_articles/4805
MLA Citation
Seddik, Karim G.
"On the Degrees of Freedom of IRS-Assisted Non-Coherent MIMO Communications." IEEE Communications Letters, vol. 26,no. 5, 2022, pp. 1175–1179.
https://fount.aucegypt.edu/faculty_journal_articles/4805