Kazuki TAKEDA

Publications (32)0.46 Total impact

• Article: Uplink Capacity of A Cellular System Using Multi-user Single-carrier MIMO Multiplexing Combined with Frequency-domain Equalization and Transmit Power Control

  Takahiro Chiba, Kazuaki Takeda, Kazuki Takeda, Fumiyuki Adachi
  [show abstract] [hide abstract]
  ABSTRACT: Multi-user single-carrier multiple-input multiple-output (MU SC-MIMO) multiplexing can increase the uplink capacity of a cellular system without expanding the signal bandwidth. It is practically important to make clear an extent to which the MU SC-MIMO multiplexing combined with frequency-domain equalization (FDE) and transmit power control (TPC) can increase the uplink capacity in the presence of the co-channel interference (CCI). Since the theoretical analysis is quite difficult, we resort to the computer simulation to investigate the uplink capacity. In this paper, frequency-domain zero-forcing detection (ZFD) and frequency-domain minimum mean square error detection (MMSED) are considered for MU signal detection. It is shown that ZFD and MMSED provide almost the same uplink capacity and that an advantage of fast TPC over slow TPC diminishes. As a result, MU SC-MIMO using computationally efficient ZFD can be used together with slow TPC instead of using MMSED. With 8 receive antennas and slow TPC, MU SC-MIMO multiplexing using ZFD can achieve about 1.5times higher uplink capacity than SU SC-SIMO diversity. KeywordsMulti-user MIMO–Single-carrier–Frequency-domain equalization–Cellular system–Uplink-capacity
  Wireless Personal Communications 04/2012; 58(3):455-468. · 0.46 Impact Factor
• Article: Uplink Capacity of OFDM Multi-User MIMO Using Near-ML Detection in a Cellular System.

  Masashi Itagaki, Tetsuya Yamamoto, Kazuki Takeda, Fumiyuki Adachi
  IEICE Transactions. 01/2012; 95-B:198-205.
• Article: Iterative MMSE-FDE/MUI Cancellation and Antenna Diversity for Frequency-Domain Filtered SC-FDMA Uplink.

  Suguru Okuyama, Kazuki Takeda, Fumiyuki Adachi
  IEICE Transactions. 01/2011; 94-B:2847-2856.
• Article: Transmission Performance of Frequency-Domain Filtered Single-Carrier Transmission Using Frequency-Domain Block Signal Detection with QRM-MLD.

  Tetsuya Yamamoto, Kazuki Takeda, Kyesan Lee, Fumiyuki Adachi
  IEICE Transactions. 01/2011; 94-B:1386-1395.
• Article: Joint MMSE-FDE & Spectrum Combining for a Broadband Single-Carrier Transmission in the Presence of Timing Offset.

  Tatsunori Obara, Kazuki Takeda, Fumiyuki Adachi
  IEICE Transactions. 01/2011; 94-B:1366-1375.
• Article: Joint Iterative Transmit/Receive FDE & FDIC for Single-Carrier Block Transmissions.

  Kazuki Takeda, Fumiyuki Adachi
  IEICE Transactions. 01/2011; 94-B:1396-1404.
• Conference Proceeding: Single-Carrier Incremental Relaying with Joint Tx/Rx FDE.

  Kazuki Takeda, Koichi Adachi, Sumei Sun, Fumiyuki Adachi
  Proceedings of the 74th IEEE Vehicular Technology Conference, VTC Fall 2011, 5-8 September 2011, San Francisco, CA, USA; 01/2011
• Article: Iterative MMSE Detection with Interference Cancellation for Up-Link HARQ Using Frequency-Domain Filtered SC-FDMA MIMO Multiplexing.

  Suguru Okuyama, Tetsuya Yamamoto, Kazuki Takeda, Fumiyuki Adachi
  IEICE Transactions. 01/2011; 94-B:3559-3568.
• Source

  Available from: tohoku.ac.jp

  Article: Performance Comparison of Overlap FDE and Sliding-Window Chip Equalization for Multi-Code DS-CDMA in a Frequency-Selective Fading Channel.

  Tatsunori Obara, Kazuki Takeda, Kyesan Lee, Fumiyuki Adachi
  IEICE Transactions. 01/2011; 94-B:750-757.
• Article: Recent advances in single-carrier distributed antenna network.

  Fumiyuki Adachi, Kazuki Takeda, Tetsuya Yamamoto, Ryusuke Matsukawa, Shinya Kumagai
  Wireless Communications and Mobile Computing. 01/2011; 11:1551-1563.
• Source

  Available from: tohoku.ac.jp

  Conference Proceeding: Downlink Throughput Performance of Distributed Antenna Network Using Transmit/Receive Diversity.

  Ryusuke Matsukawa, Tatsunori Obara, Kazuki Takeda, Fumiyuki Adachi
  Proceedings of the 74th IEEE Vehicular Technology Conference, VTC Fall 2011, 5-8 September 2011, San Francisco, CA, USA; 01/2011
• Source

  Available from: ac.jp

  Conference Proceeding: MMSE Frequency-Domain Equalization Using Spectrum Combining for Nyquist Filtered Broadband Single-Carrier Transmission

  Suguru Okuyama, Kazuki Takeda, Fumiyuki Adachi
  [show abstract] [hide abstract]
  ABSTRACT: Single carrier (SC) signal transmission has a property of low peak-to-average power ratio (PAPR) and achieves the frequency diversity gain by the use of frequency-domain equalization (FDE) based on the minimum mean square error (MMSE) criterion. In this paper, Nyquist filtered broadband SC transmission is considered. As the transmit filter roll-off factor α increases, the signal bandwidth increases and the PAPR reduces. MMSE-FDE using spectrum combining was proposed in [15]. An additional frequency diversity gain can be obtained by making use of the excess bandwidth introduced by the transmit filter and by using spectrum combining. In this paper, we thoroughly investigate how α affects PAPR, BER performance, and throughput performance.
  Vehicular Technology Conference (VTC 2010-Spring), 2010 IEEE 71st; 06/2010
• Source

  Available from: tohoku.ac.jp

  Article: Frequency-Domain Block Signal Detection for Single-Carrier Transmission.

  Tetsuya Yamamoto, Kazuki Takeda, Fumiyuki Adachi
  IEICE Transactions. 01/2010; 93-B:2104-2112.
• Article: Recent Advances in Single-Carrier Frequency-Domain Equalization and Distributed Antenna Network.

  Fumiyuki Adachi, Kazuki Takeda, Tatsunori Obara, Tetsuya Yamamoto, Hiroki Matsuda
  IEICE Transactions. 01/2010; 93-A:2201-2211.
• Conference Proceeding: Joint iterative transmit/receive frequency-domain equalization & ISI cancellation for broadband single-carrier block transmissions.

  Kazuki Takeda, Fumiyuki Adachi
  Proceedings of the 6th International Wireless Communications and Mobile Computing Conference, IWCMC 2010, Caen, France, June 28 - July 2, 2010; 01/2010
• Source

  Available from: tohoku.ac.jp

  Article: Joint Water Filling-MRT Downlink Transmit Diversity for a Broadband Single-Carrier Distributed Antenna Network.

  Hiroki Matsuda, Kazuki Takeda, Fumiyuki Adachi
  IEICE Transactions. 01/2010; 93-B:2753-2760.
• Source

  Available from: tohoku.ac.jp

  Conference Proceeding: Single-Carrier Hybrid ARQ Using Joint Transmit/Receive MMSE-FDE.

  Kazuki Takeda, Fumiyuki Adachi
  Proceedings of the 71st IEEE Vehicular Technology Conference, VTC Spring 2010, 16-19 May 2010, Taipei, Taiwan; 01/2010
• Conference Proceeding: Polynomial Prediction RLS Channel Estimation for DSCDMA Frequency-domain Equalization.

  Yohei Kojima, Kazuki Takeda, Fumiyuki Adachi
  Proceedings of the 70th IEEE Vehicular Technology Conference, VTC Fall 2009, 20-23 September 2009, Anchorage, Alaska, USA; 01/2009
• Article: Introduction of Frequency-Domain Signal Processing to Broadband Single-Carrier Transmissions in a Wireless Channel.

  Fumiyuki Adachi, Hiromichi Tomeba, Kazuki Takeda
  IEICE Transactions. 01/2009; 92-B:2789-2808.
• Source

  Available from: tohoku.ac.jp

  Article: Joint Frequency-Domain Equalization and Despreading for Multi-Code DS-CDMA Using Cyclic Delay Transmit Diversity.

  Tetsuya Yamamoto, Kazuki Takeda, Fumiyuki Adachi
  IEICE Transactions. 01/2009; 92-B:1563-1572.