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Uplink Spectral and...
Uplink Spectral and Energy Efficiency of Cell-Free Massive MIMO With Optimal Uniform Quantization
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- Bashar, Manijeh (författare)
- Univ Surrey, Inst Commun Syst, Home 5G Innovat Ctr 5GIC, Guildford GU2 7XH, Surrey, England.
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- Ngo, Hien Quoc (författare)
- Queens Univ Belfast, Sch Elect Elect Engn & Comp Sci, Belfast T7 1NN, Antrim, North Ireland.
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- Cumanan, Kanapathippillai (författare)
- Univ York, Dept Elect Engn, York YO10 5NG, N Yorkshire, England.
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- Burr, Alister G. (författare)
- Univ York, Dept Elect Engn, York YO10 5NG, N Yorkshire, England.
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- Xiao, Pei (författare)
- Univ Surrey, Inst Commun Syst, Home 5G Innovat Ctr 5GIC, Guildford GU2 7XH, Surrey, England.
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- Björnson, Emil, Professor, 1983- (författare)
- Linköpings universitet,Kommunikationssystem,Tekniska fakulteten
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- Larsson, Erik G (författare)
- Linköpings universitet,Kommunikationssystem,Tekniska fakulteten
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Univ Surrey, Inst Commun Syst, Home 5G Innovat Ctr 5GIC, Guildford GU2 7XH, Surrey, England Queens Univ Belfast, Sch Elect Elect Engn & Comp Sci, Belfast T7 1NN, Antrim, North Ireland. (creator_code:org_t)
- IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 2021
- 2021
- Engelska.
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Ingår i: IEEE Transactions on Communications. - : IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC. - 0090-6778 .- 1558-0857. ; 69:1, s. 223-245
- Relaterad länk:
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https://urn.kb.se/re...
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https://doi.org/10.1...
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https://urn.kb.se/re...
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Abstract
Ämnesord
Stäng
- This paper investigates the performance of limited-fronthaul cell-free massive multiple-input multiple-output (MIMO) taking account the fronthaul quantization and imperfect channel acquisition. Three cases are studied, which we refer to as Estimate&Quantize, Quantize&Estimate, and Decentralized, according to where channel estimation is performed and exploited. Maximum-ratio combining (MRC), zero-forcing (ZF), and minimum mean-square error (MMSE) receivers are considered. The Max algorithm and the Bussgang decomposition are exploited to model optimum uniform quantization. Exploiting the optimal step size of the quantizer, analytical expressions for spectral and energy efficiencies are presented. Finally, an access point (AP) assignment algorithm is proposed to improve the performance of the decentralized scheme. Numerical results investigate the performance gap between limited fronthaul and perfect fronthaul cases, and demonstrate that exploiting relatively few quantization bits, the performance of limited-fronthaul cell-free massive MIMO closely approaches the perfect-fronthaul performance.
Ämnesord
- TEKNIK OCH TEKNOLOGIER -- Elektroteknik och elektronik -- Signalbehandling (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Electrical Engineering, Electronic Engineering, Information Engineering -- Signal Processing (hsv//eng)
- TEKNIK OCH TEKNOLOGIER -- Elektroteknik och elektronik -- Telekommunikation (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Electrical Engineering, Electronic Engineering, Information Engineering -- Telecommunications (hsv//eng)
Nyckelord
- Bussgang decomposition
- cell-free massive MIMO
- C-RAN
- energy efficiency
- quantization
- optimal uniform quantization
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