"Xu, Guixian" - Selaus tekijän mukaan TUNICRIS-julkaisut

Viitteet 1-11 / 11

    • Cellular Digital Post-Distortion: Signal Processing Methods and RF Measurements 

      Babaroglu, Huseyin; Anttila, Lauri; Xu, Guixian; Turunen, Matias; Allén, Markus; Valkama, Mikko (2023)
      conference
      <p>In this paper, we study the feasibility of digital post-distortion (DPoD) based mitigation of transmitter nonlinear distortion in cellular networks. With specific emphasis on downlink, we describe a computationally ...

    • Cluster-based flow control in hybrid software-defined wireless sensor networks 

      Liu, Qingzhi; Cheng, Long; Alves, Renan; Ozcelebi, Tanir; Kuipers, Fernando; Xu, Guixian; Lukkien, Johan; Chen, Shanzhi (14.03.2021)
      article
      <p>Software-defined networking (SDN) is a cornerstone of next-generation networks and has already led to numerous advantages for data-center networks and wide-area networks. However, SDN is not widely adopted in constrained ...

    • Digital Polar Transmitters for Massive MIMO: Sum-Rate and Power Efficiency Analysis 

      Xu, Guixian; Lampu, Vesa; Kosunen, Marko; Unnikrishnan, Vishnu; Ryynänen, Jussi; Valkama, Mikko; Anttila, Lauri (01.01.2023)
      article
      <p>In this article, we comprehensively investigate the potential of the digital polar radio transmitter architecture for multi-user massive multiple-input multiple-output orthogonal frequency-division multiplexing (MIMO-OFDM) ...

    • Digital Post-Distortion for Multi-Layer MIMO-OFDM 

      Babaroglu, Huseyin; Anttila, Lauri; Xu, Guixian; Valkama, Mikko (07 / 2024)
      article
      <p>In this letter, we propose a new digital post-distortion (DPoD) technique for precoded multi-layer orthogonal frequency division multiplexing (OFDM) systems, in order to enhance the received signal error vector magnitude ...

    • Energy-Efficient Array Transmitters Through Outphasing and Over-the-Air Combining 

      Lampu, Vesa; Xu, Guixian; Anttila, Lauri; Brihuega Garcia, Alberto; Kosunen, Marko; Ryynänen, Jussi; Valkama, Mikko
      Asilomar Conference on Signals, Systems, and Computers proceedings (2022)
      conference
      In this paper, a combinerless outphasing architecture for multiantenna transmitters with analog beamforming is presented and analyzed. The outphasing transmitter facilitates the use of highly power efficient switch-mode ...

    • Energy-Efficient Power Allocation and Splitting for MmWave Beamspace MIMO-NOMA with SWIPT 

      Chen, Liangyu; Hu, Bo; Xu, Guixian; Chen, Shanzhi (15.07.2021)
      article
      <p>Non-orthogonal multiple access (NOMA) has recently been employed into millimeter wave (mmWave) beamspace MIMO to further improve connection density and spectrum efficiency for the emerging cellular internet of things ...

    • Multilevel Outphasing with Over-the-Air Combining in Large Antenna Arrays 

      Lampu, Vesa; Xu, Guixian; Brihuega Garcia, Alberto; Kosunen, Marko; Unnikrishnan, Vishnu; Ryynänen, Jussi; Fager, Christian; Valkama, Mikko; Anttila, Lauri (12 / 2023)
      article
      This article investigates the feasibility of combinerless multilevel outphasing transmitter as a potential architecture for large millimeter-wave (mmWave) phased arrays. We consider two distinct ways of distributing the ...

    • QoE-Aware Resource Allocation for Non-Orthogonal Multiple Access Enhanced HetNets 

      Chen, Liangyu; Hu, Bo; Chen, Shanzhi; Xu, Jianpeng; Xu, Guixian (2021)
      article
      <p>Non-orthogonal multiple access (NOMA) has drawn significant attention due to its high spectral efficiency. Invoking NOMA in heterogeneous networks (HetNets) can support ubiquitous connectivity and satisfy the growing ...

    • QoE-driven resource allocation for D2D underlaying NOMA cellular networks 

      Chen, Liangyu; Hu, Bo; Xu, Guixian
      IEEE Wireless Communications and Networking Conference, WCNC (2021)
      conference
      <p>Device-to-device (D2D) communication can significantly improve network coverage and spectral efficiency. Meanwhile, non-orthogonal multiple access (NOMA) has recently been integrated with D2D communication to further ...

    • Quantized Polar Transmitters for Power Efficient Massive MIMO Systems 

      Xu, Guixian; Lampu, Vesa; Kosunen, Marko; Stadius, Kari; Ryynänen, Jussi; Valkama, Mikko; Anttila, Lauri (2020)
      article
      <p>This letter investigates the feasibility of the quantized digital polar transmitter architecture in a downlink multi-user massive multiple-input multiple-output orthogonal frequency-division multiplexing (MIMO-OFDM) ...

    • Reconfigurable Signal Processing and DSP Hardware Generator for 5G Transmitters 

      Ghosh, Agnimesh; Spelman, Andrei; Cheung, Tze Hin; Boopathy, Dhanashree; Unnikrishnan, Vishnu; Lampu, Vesa; Xu, Guixian; Anttila, Lauri; Stadius, Kari; Kosunen, Marko; Ryynänen, Jussi
      2022 IEEE Nordic Circuits and Systems Conference, NORCAS 2022 - Proceedings (2022)
      conference
      <p>To impose the reconfigurability and reusability of digital circuits for millimeterwave transmitter architectures, high-speed digital signal processing architectures are explored. The digital front-end of these next-generation ...