TY - GEN
T1 - Channel Estimation Using In-Band Pilots for Cell-Free Massive MIMO
AU - Lam, Chan Tong
AU - Wang, Ke
AU - Ng, Benjamin K.
N1 - Publisher Copyright:
© 2023 IEEE.
PY - 2023
Y1 - 2023
N2 - In this paper, a novel channel estimation technique using in-band pilots (IBPs) for uplink transmission is proposed for cell-free (CF) massive multiple-input multiple-output (MIMO) networks. In particular, compared to traditional superimposed pilot schemes in the time domain, the proposed IBP scheme is operated in the frequency domain, which is more effective and robust due to the removal of interference from the data frequen-cies at the pilot location. We first introduce a system model for the CF massive MIMO with the IBP design. Then, analytical expressions for the mean square error and the normalized mean square error (NMSE) are derived for performance evaluation. Analytical and simulated results reveal that the proposed IBP scheme for CF MIMO outperforms the conventional regular and superimposed pilots in terms of NMSE. Besides, other important insights include the IBP scheme works well in high transmit power regions, and this new channel estimation strategy is more suitable for the scenario with a large number of users since it is not that sensitive to the number of users.
AB - In this paper, a novel channel estimation technique using in-band pilots (IBPs) for uplink transmission is proposed for cell-free (CF) massive multiple-input multiple-output (MIMO) networks. In particular, compared to traditional superimposed pilot schemes in the time domain, the proposed IBP scheme is operated in the frequency domain, which is more effective and robust due to the removal of interference from the data frequen-cies at the pilot location. We first introduce a system model for the CF massive MIMO with the IBP design. Then, analytical expressions for the mean square error and the normalized mean square error (NMSE) are derived for performance evaluation. Analytical and simulated results reveal that the proposed IBP scheme for CF MIMO outperforms the conventional regular and superimposed pilots in terms of NMSE. Besides, other important insights include the IBP scheme works well in high transmit power regions, and this new channel estimation strategy is more suitable for the scenario with a large number of users since it is not that sensitive to the number of users.
KW - cell-free massive MIMO
KW - channel estimation
KW - in-band pilots
KW - NMSE
KW - superim-posed pilots
UR - http://www.scopus.com/inward/record.url?scp=85190287011&partnerID=8YFLogxK
U2 - 10.1109/VCC60689.2023.10474840
DO - 10.1109/VCC60689.2023.10474840
M3 - Conference contribution
AN - SCOPUS:85190287011
T3 - 2023 IEEE Virtual Conference on Communications, VCC 2023
SP - 200
EP - 205
BT - 2023 IEEE Virtual Conference on Communications, VCC 2023
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - 2023 IEEE Virtual Conference on Communications, VCC 2023
Y2 - 28 November 2023 through 30 November 2023
ER -