This study proposes a finely quality of service (QoS)-guaranteed algorithm to jointly optimise the throughput and energy efficiency in MU-multiple-inputmultiple-outputsystems. The latency requirements of real-time s...
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This study proposes a finely quality of service (QoS)-guaranteed algorithm to jointly optimise the throughput and energy efficiency in MU-multiple-inputmultiple-outputsystems. The latency requirements of real-time services are guaranteed by user scheduling in the first stage. The energy efficiency and system throughput are jointly optimised while the required transmission rate is finely guaranteed in the second stage. Simulation results show that the algorithm can achieve a good balance between the energy efficiency and throughput, and is superior to the existing schemes in terms of QoS guarantee.
Fully-synchronous measurements of a massive multi-usermultiple-inputmultiple-output (MU-MIMO) radio propagation channel are presented. We evaluate the ability of a massive MIMO system to spatially separate users loc...
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ISBN:
(纸本)9781467364324
Fully-synchronous measurements of a massive multi-usermultiple-inputmultiple-output (MU-MIMO) radio propagation channel are presented. We evaluate the ability of a massive MIMO system to spatially separate users located close to each other in line-of-sight (LOS) propagation conditions. The system consists of a base-station (BS) antenna array equipped with 64 dual-polarized antenna elements (128 ports) arranged in a cylindrical configuration, and eight single-antenna users. The users are confined to a five-meter diameter circle and move randomly at pedestrian speeds. The BS antenna array is located on top of a 20 m tall building and has LOS to the users. We examine user separability by studying singular value spread of the MU-MIMO channel matrix for several subsets of BS antenna array ports, along with sum-rate capacity and achievable sum-rates with both zero-forcing and matched-filtering linear precoders. We also analyze the performance of the user with the lowest rate. Finally, a comparison between the performance offered by the massive MIMO system and that of a conventional MU-MIMO system is provided. To the best of our knowledge, this is the first report of fully-synchronous dynamic measurements of a massive MIMO system. Our investigation shows that even users located close to each other in LOS propagation conditions can be spatially separated in a massive MIMO system.
In this paper, a novel limited feedback scheme, based on scalar quantization, is proposed for Tomlinson-Harashima precoding (THP) in multi-usermultiple-inputmultiple-output (MU-MIMO) systems. Due to the sensitivity ...
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ISBN:
(纸本)9781612846835;9781612846828
In this paper, a novel limited feedback scheme, based on scalar quantization, is proposed for Tomlinson-Harashima precoding (THP) in multi-usermultiple-inputmultiple-output (MU-MIMO) systems. Due to the sensitivity of THP to erroneous channel state information (CSI), the conventional codebook-based channel vector quantization (CVQ) is no longer suitable since its complexity grows exponentially with the increase of feedback bits. This paper combines the optimum Gaussian scalar quantization (GSQ) with THP to improve the accuracy of CSI for the flat Rayleigh fading channel. Simulation results show that the GSQ-THP scheme provides a very high capacity and a good bit error rate (BER) performance.
Fully-synchronous measurements of a massive multi-usermultiple-inputmultiple-output (MU-MIMO) radio propagation channel are presented. We evaluate the ability of a massive MIMO system to spatially separate users loc...
详细信息
ISBN:
(纸本)9781467364300
Fully-synchronous measurements of a massive multi-usermultiple-inputmultiple-output (MU-MIMO) radio propagation channel are presented. We evaluate the ability of a massive MIMO system to spatially separate users located close to each other in line-of-sight (LOS) propagation conditions. The system consists of a base-station (BS) antenna array equipped with 64 dual-polarized antenna elements (128 ports) arranged in a cylindrical configuration, and eight single-antenna users. The users are confined to a five-meter diameter circle and move randomly at pedestrian speeds. The BS antenna array is located on top of a 20 m tall building and has LOS to the users. We examine user separability by studying singular value spread of the MU-MIMO channel matrix for several subsets of BS antenna array ports, along with sum-rate capacity and achievable sum-rates with both zero-forcing and matched-filtering linear precoders. We also analyze the performance of the user with the lowest rate. Finally, a comparison between the performance offered by the massive MIMO system and that of a conventional MU-MIMO system is provided. To the best of our knowledge, this is the first report of fully-synchronous dynamic measurements of a massive MIMO system. Our investigation shows that even users located close to each other in LOS propagation conditions can be spatially separated in a massive MIMO system.
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