@inproceedings{fcf6d5163bac45ddb56c19b5a0b0ccdf,
title = "Optimizing Pilots and Analog Processing for Channel Estimation in Cell-Free Massive MIMO with One-Bit ADCs",
abstract = "In a cell-free cloud radio access network (C-RAN) architecture, uplink channel estimation is carried out by a centralized baseband processing unit (BBU) connected to distributed remote radio heads (RRHs). When the RRHs have multiple antennas and limited radio front-end resources, the design of uplink channel estimation is faced with the challenges posed by reduced radio frequency (RF) chains and one-bit analog-to-digital converters (ADCs) at the RRHs. This work tackles the problem of jointly optimizing the pilot sequences and the pre-RF chains analog combiners with the goal of minimizing the sum of mean squared errors (MSEs) of the estimated channel vectors at the BBU. The problem formulation models the impact of the ADC operation by leveraging Bussgang's theorem. An efficient solution is developed by means of an iterative alternating optimization algorithm. Numerical results validate the advantages of the proposed joint design compared to baseline schemes that randomly choose either pilots or analog combiners.",
keywords = "Bussgang's theorem, C-RAN, Channel estimation, analog combining, one-bit ADC, pilot design",
author = "Park, {Seok Hwan} and Osvaldo Simeone and Eldar, {Yonina C.} and Elza Erkip",
note = "Funding Information: S.-H. Park was supported by the NRF Korea funded by the Ministry of Science, ICT & Future Planning through grant 2015R1C1A1A01051825. The work of O. Simeone was partially supported by U.S. NSF through grant 1525629. O. Simeone has also received funding from the European Research Council (ERC) under the European Union{\textquoteright}s Horizon 2020 research and innovation programme (grant agreement No 725731). Y. C. Eldar received funding from the European Union{\textquoteright}s Horizon 2020 research and innovation program under grant agreement No. 646804-ERC-COG-BNYQ, and from the Israel Science Foundation under Grant. No. 335/14. E. Erkip was supported by U.S. NSF through grants 1302336 and 1547332. Publisher Copyright: {\textcopyright} 2018 IEEE.; 19th IEEE International Workshop on Signal Processing Advances in Wireless Communications, SPAWC 2018 ; Conference date: 25-06-2018 Through 28-06-2018",
year = "2018",
month = aug,
day = "24",
doi = "10.1109/SPAWC.2018.8445960",
language = "English (US)",
isbn = "9781538635124",
series = "IEEE Workshop on Signal Processing Advances in Wireless Communications, SPAWC",
publisher = "Institute of Electrical and Electronics Engineers Inc.",
booktitle = "2018 IEEE 19th International Workshop on Signal Processing Advances in Wireless Communications, SPAWC 2018",
}