Transmission performance of OFDM-based 1024-QAM in multipath fading conditions

Tian, Ruxiao; Ota, Tomoki; Otsuka, Hiroyuki

doi:10.1587/comex.2018xbl0053

Cited by 15 publications

(3 citation statements)

References 7 publications

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“…In this paper, we focus on the performance evaluation of downlink user throughput. As the use of higher-order QAM is expected to increase data rates within a limited bandwidth, the implementation of 1024-QAM and 4096-QAM has been discussed [26][27][28] for 5G and beyond. However, in the simulations, we use 15 types of MCS indexes up to 256-QAM in the downlink as listed in Table 2, because the application conditions for these post 256-QAM are currently very limited.…”

Section: Simulation Setupmentioning

confidence: 99%

Personal Picocell Scheme Using Adaptive Control CRE in Heterogeneous Mobile Networks

Fujisawa

Kemmochi

Otsuka

2020

JSAN

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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.

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Section: Simulation Setupmentioning

confidence: 99%

Personal Picocell Scheme Using Adaptive Control CRE in Heterogeneous Mobile Networks

Fujisawa

Kemmochi

Otsuka

2020

JSAN

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“…The use of 3D beamforming by MIMO antennas enables directs signal transmission toward a target UE, potentially increasing the received signal-to-noise ratio (SNR) or signal-to-interference plus noise ratio (SINR) while reducing the interference directed to adjacent cells and other UEs [20][21][22].New technologies such as the small-cell strategy, HetNets, relay systems, and 3D beamforming that improve the received SINR will enhance the introduction of higher-order QAM schemes. Previously, we proposed OFDM-based 256-, 1024-, and 4096-QAM for use in mobile systems and determined the fundamental transmission performance needed for the use of hard-decision Viterbi decoding in a typical additive white Gaussian noise (AWGN) channel [23][24][25][26]. However, the transmission performance of higher-order QAM with soft-decision Viterbi decoding in multipath fading channels has not been sufficiently investigated.On the basis of this background, in this study we investigate the transmission performance of OFDM-based 1024-and 4096-QAM with soft-decision Viterbi decoding in multipath fading channels using link-level simulations.…”

mentioning

confidence: 99%

“…New technologies such as the small-cell strategy, HetNets, relay systems, and 3D beamforming that improve the received SINR will enhance the introduction of higher-order QAM schemes. Previously, we proposed OFDM-based 256-, 1024-, and 4096-QAM for use in mobile systems and determined the fundamental transmission performance needed for the use of hard-decision Viterbi decoding in a typical additive white Gaussian noise (AWGN) channel [23][24][25][26]. However, the transmission performance of higher-order QAM with soft-decision Viterbi decoding in multipath fading channels has not been sufficiently investigated.…”

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confidence: 99%

Transmission Performance of an OFDM-Based Higher-Order Modulation Scheme in Multipath Fading Channels

Otsuka

Tian

2019

JSAN

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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.small-cells [8,9], which can improve both system capacity and link budget because each eNB in a small-cell is directly connected to a core network. As another small-cell strategy, the concept of a phantom cell, has been proposed to provide efficient management of radio resources and mobility operation, where small-cells are overlaid on a macro-cell [10,11]. This approach splits the control and user-data planes; that is, the macro-eNB manages all UE within the overlaid cells, although UE can connect to a neighboring low-power eNB in the small-cell.Heterogeneous networks (HetNets) are another solution of denser infrastructures in which smallor pico-cells with low-power eNBs are installed within the coverage area of a macro-cell [12][13][14][15][16]. The objective of HetNet is to allow the UE to access pico-cells that overlap within a geographical coverage area even when the UE is within the coverage of a donor macro-cell. In other words, when the traffic in the donor macro-cell increases, its UE can access the pico-cells automatically. Through this mechanism, HetNet can increase system capacity, particularly when there is the heavy traffic in the macro-cell.Relay systems are an alternative approach to denser infrastructures that are primarily useful in improving cell edge performance in macro-cells [17][18][19]. In this scheme, a relay node (RN) installed at a macro-cell edge where the received signal power from the serving eNB is low can transmit a strengthened signal to the UE. Thus, the RN can physically reduce the distance between eNB and UE. Three-dimensional (3D) beamforming is another key technology for achieving 5G in which antenna beams can be individually tailored to each UE in the elevation domain through the use of a massive multiple-input and multiple-output (MIMO) antenna architectures. The use of 3D beamforming by MIMO antennas enables directs signal transmission toward a target UE, potentially increasing the received signal-...

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Transmission Performance of OFDM-based 1024-QAM under Different Types of Multipath Fading Channels

Kosuge

Otsuka

2021

2021 IEEE VTS 17th Asia Pacific Wireless Communications Symposium (APWCS)

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Transmission performance of OFDM-based 1024-QAM in multipath fading conditions

Cited by 15 publications

References 7 publications

Personal Picocell Scheme Using Adaptive Control CRE in Heterogeneous Mobile Networks

Personal Picocell Scheme Using Adaptive Control CRE in Heterogeneous Mobile Networks

Transmission Performance of an OFDM-Based Higher-Order Modulation Scheme in Multipath Fading Channels

Transmission Performance of OFDM-based 1024-QAM under Different Types of Multipath Fading Channels

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