TY - GEN
T1 - A Low-Complexity Multiuser Adaptive Modulation Scheme for MRC Receivers in Massive MIMO Systems
AU - Radbord, Amin
AU - Abdel Hafez, Mohammed
AU - Amini, Mohammadreza
N1 - Publisher Copyright:
© 2022 IEEE.
PY - 2022
Y1 - 2022
N2 - This paper presents a low-complexity adaptive scheme for an uplink multiuser transmission in a massive multiple-input and multiple-output (MIMO) system using maximum-ratio combining (MRC) at the receiver. Instead of using small-scale fast-varying fading, slow-varying large-scale shadowing information is exploited to adapt the desired mode among a discrete set of modulations available at the transmitter side. Since users experience different large-scale fading parameters, the adaptation procedure has to be calculated separately for each user. Therefore, this scheme is called multiuser adaptive modulation (MAM) and is compared to the traditional approach called fast adaptive modulation (FAM), which accounts for small-scale fast-varying fading for adaptation. Furthermore, the closed-form expressions for the average spectral efficiency and bit error outage are derived. In comparison with the FAM scheme and the previous research results, the outcome of this paper shows that at low transmit power, the aforementioned adaptive scheme by the MRC receiver gives a similar performance.
AB - This paper presents a low-complexity adaptive scheme for an uplink multiuser transmission in a massive multiple-input and multiple-output (MIMO) system using maximum-ratio combining (MRC) at the receiver. Instead of using small-scale fast-varying fading, slow-varying large-scale shadowing information is exploited to adapt the desired mode among a discrete set of modulations available at the transmitter side. Since users experience different large-scale fading parameters, the adaptation procedure has to be calculated separately for each user. Therefore, this scheme is called multiuser adaptive modulation (MAM) and is compared to the traditional approach called fast adaptive modulation (FAM), which accounts for small-scale fast-varying fading for adaptation. Furthermore, the closed-form expressions for the average spectral efficiency and bit error outage are derived. In comparison with the FAM scheme and the previous research results, the outcome of this paper shows that at low transmit power, the aforementioned adaptive scheme by the MRC receiver gives a similar performance.
KW - Adaptive modulation
KW - large-scale fading
KW - massive MIMO
KW - maximum-ratio combining
KW - power control
UR - http://www.scopus.com/inward/record.url?scp=85135222056&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85135222056&partnerID=8YFLogxK
U2 - 10.1109/ICUFN55119.2022.9829637
DO - 10.1109/ICUFN55119.2022.9829637
M3 - Conference contribution
AN - SCOPUS:85135222056
T3 - International Conference on Ubiquitous and Future Networks, ICUFN
SP - 80
EP - 85
BT - ICUFN 2022 - 13th International Conference on Ubiquitous and Future Networks
PB - IEEE Computer Society
T2 - 13th International Conference on Ubiquitous and Future Networks, ICUFN 2022
Y2 - 5 July 2022 through 8 July 2022
ER -