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Prof. Hiroyuki Otsuka
Kogakuin University

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0 Beamforming
0 QAM
0 HetNets
0 Mobile and wireless communications
0 fiber-radio

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Journal article
Published: 14 October 2020 in Journal of Sensor and Actuator Networks
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Heterogeneous networks (HetNets), which are combined with a macrocell and picocell in the same coverage, are expected to further increase the system capacity in fifth-generation mobile systems and beyond. In HetNets, the cell range expansion (CRE) technique plays an important role and can allow more user equipment (UE) to access the picocell, i.e., virtually expand the picocell coverage. However, conventional CRE techniques that provide a fixed cell selection offset (CSO) for all UE may worsen user throughput if UE is forced to connect to the picocell because the received signal-to-interference plus noise ratio of the UE becomes lower. Therefore, we propose a personal picocell scheme using an adaptive control CRE technique to improve user throughput in which different CSOs are assigned to UE to form each optimal picocell for each UE. In this paper, we first describe the aspects and algorithm of the proposed scheme. Then, we show the user throughput for adaptive control CRE in comparison with conventional CRE by using system-level computer simulations for the two types of HetNets, i.e., single-band and multi-band HetNets. In the simulations, we first clarify the optimal parameters of the adaptive control CRE. We then show the average and 5-percentile user throughput of the optimized adaptive control CRE in comparison with that of conventional CRE. From these results, we confirmed that the personal picocell scheme using the adaptive control CRE can improve the 5-percentile user throughput while maintaining the average user throughput compared with that of conventional CRE.

ACS Style

Kento Fujisawa; Fumiya Kemmochi; Hiroyuki Otsuka. Personal Picocell Scheme Using Adaptive Control CRE in Heterogeneous Mobile Networks. Journal of Sensor and Actuator Networks 2020, 9, 48 .

AMA Style

Kento Fujisawa, Fumiya Kemmochi, Hiroyuki Otsuka. Personal Picocell Scheme Using Adaptive Control CRE in Heterogeneous Mobile Networks. Journal of Sensor and Actuator Networks. 2020; 9 (4):48.

Chicago/Turabian Style

Kento Fujisawa; Fumiya Kemmochi; Hiroyuki Otsuka. 2020. "Personal Picocell Scheme Using Adaptive Control CRE in Heterogeneous Mobile Networks." Journal of Sensor and Actuator Networks 9, no. 4: 48.

Journal article
Published: 27 March 2019 in Journal of Sensor and Actuator Networks
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Fifth-generation (5G) mobile systems are a necessary step toward successfully achieving further increases in data rates. As the use of higher-order quadrature amplitude modulation (QAM) is expected to increase data rates within a limited bandwidth, we propose a method for orthogonal frequency division multiplexing (OFDM)-based 1024- and 4096-QAM transmission with soft-decision Viterbi decoding for use in 5G mobile systems. Through evaluation of the transmission performance of the proposed method over multipath fading channels using link-level simulations, we determine the bit error rate (BER) performance of OFDM-based 1024- and 4096-QAM as a function of coding rate under two multipath fading channel models: extended pedestrian A (EPA) and extended vehicular A (EVA). We also demonstrate the influence of phase error on OFDM-based 1024- and 4096-QAM and clarify the relationship between phase error and the signal-to-noise ratio (SNR) penalty required to achieve a BER of 1 × 10−2. This work provides an effective solution for introducing higher-order modulation schemes in 5G and beyond.

ACS Style

Hiroyuki Otsuka; Ruxiao Tian; Koki Senda. Transmission Performance of an OFDM-Based Higher-Order Modulation Scheme in Multipath Fading Channels. Journal of Sensor and Actuator Networks 2019, 8, 19 .

AMA Style

Hiroyuki Otsuka, Ruxiao Tian, Koki Senda. Transmission Performance of an OFDM-Based Higher-Order Modulation Scheme in Multipath Fading Channels. Journal of Sensor and Actuator Networks. 2019; 8 (2):19.

Chicago/Turabian Style

Hiroyuki Otsuka; Ruxiao Tian; Koki Senda. 2019. "Transmission Performance of an OFDM-Based Higher-Order Modulation Scheme in Multipath Fading Channels." Journal of Sensor and Actuator Networks 8, no. 2: 19.

Journal article
Published: 01 January 2017 in IEICE Communications Express
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ACS Style

Norihiro Naganuma; Sho Nakazawa; Satoshi Suyama; Yukihiko Okumura; Hiroyuki Otsuka. Performance Evaluation of Adaptive Control CRE in HetNet with eICIC Scheme. IEICE Communications Express 2017, 6, 166 -171.

AMA Style

Norihiro Naganuma, Sho Nakazawa, Satoshi Suyama, Yukihiko Okumura, Hiroyuki Otsuka. Performance Evaluation of Adaptive Control CRE in HetNet with eICIC Scheme. IEICE Communications Express. 2017; 6 (4):166-171.

Chicago/Turabian Style

Norihiro Naganuma; Sho Nakazawa; Satoshi Suyama; Yukihiko Okumura; Hiroyuki Otsuka. 2017. "Performance Evaluation of Adaptive Control CRE in HetNet with eICIC Scheme." IEICE Communications Express 6, no. 4: 166-171.