Abstract
In this letter, we present the first study for uplink cell-free massive multi-input multi-output (MIMO) systems with superimposed pilots (SPs). Closed-form linear minimum mean square error (LMMSE) channel estimation and achievable spectral efficiency (SE) expressions with maximal ratio combining (MRC) receiver filters are derived. The tractability of the closed-form results facilitates analyzing the effects of key design system parameters, such as the number of mobile terminals (MTs), the power balance factor between pilot and data symbols, and the length of coherence interval. Several significant insights are attained by assuming that the introduced pilot interference can or cannot be perfectly canceled from received data symbols. All the theoretical results are corroborated by simulation experiments.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
