Performance evaluation of OFDM-based 256- and 1024-QAM in multipath fading propagation conditions

Ota, Tomoki; Nakamura, Mitsutoshi; Otsuka, Hiroyuki

doi:10.1109/icufn.2017.7993849

Cited by 14 publications

(6 citation statements)

References 7 publications

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“…Hence, the distribution of the real part, 𝑓(𝐻 𝑟 ) and the imaginary part, 𝑓(𝐻 𝑖 ) would approach a Gaussian distribution after the FFT operation with a mean equal to zero, μ=0, and variance 𝜎 ℎ 𝑟 2 and 𝜎 ℎ 𝑖 2 computed in the next section. According to the central limit theorem (CLT) [23] as (10).…”

Section: Research Methods 21 System Modelmentioning

confidence: 99%

“…In the last few years, there have been a lot of studies done on the success of wireless channel models. In [10], the study of the performance evaluation of the OFDM-based 256 and 1024-QAM under multipath fading propagation circumstances defines the acceptable signal-to-noise ratio (SNR). In [11], focuses on the performance evaluation and investigation of OFDM systems operating across multipath fading channels like additive white Gaussian noise (AWGN), Rician, and Rayleigh.…”

Section: Introductionmentioning

confidence: 99%

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Performance evaluation of 4-quadrature amplitude modulation over orthogonal frequency division multiplexing system in different fading channels scenarios

Mohammed

Al-Rubaye²

2022

IJECE

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<p>Orthogonal frequency division multiplexing (OFDM) is a multicarrier modulation (MCM) technique that divides the wide bandwidth into parallel narrow bands, each of which is modulated by orthogonal subcarriers. Currently, OFDM is a high-spectral efficiency modulation technique that is used in a variety of wired and wireless applications. The transmitted signal in a wireless communication channel spreads from transmitter to receiver through multiple reflective paths. This triggers multipath fading, which causes variations in the received signal's amplitude and phase. Slow/fast and frequency-selective/frequency-nonselective are the main types of multipath fading channels. Therefore, in this paper, we proposed new models for modeling multipath fading channels, such as the exponential fading channel and the Gamma fading channel. In addition, new bit-error-rate (BER) derivations have been derived. The performance of the OFDM system over proposed channel models has been evaluated using Monte-Carlo simulation and compared to the Rayleigh fading channel model. The obtained results via simulations show that the exponential fading channel at a rate parameter (λ=0.5) outperforms the Rayleigh fading channel by 6 dB for all values of Eb/No, while the Gamma fading channel at (α=2) outperforms the Rayleigh fading channel by 3 dB for all values of Eb/No.</p>

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Section: Research Methods 21 System Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Performance evaluation of 4-quadrature amplitude modulation over orthogonal frequency division multiplexing system in different fading channels scenarios

Mohammed

Al-Rubaye²

2022

IJECE

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“…Motivated by this observation, in this paper, we focus on much higher-order modulation, i.e., the use of 1024-QAM. We demonstrate the bit error rate (BER) performance of the OFDM-based 1024-QAM with turbo coding in multipath fading propagation conditions [8,9]. The transmission model of the proposed OFDMbased 1024-QAM and the computer simulation conditions are described in Section 2.…”

Section: Introductionmentioning

confidence: 99%

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

2018

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Higher-order modulation is promising technique of 5th-generation mobile systems to increase data rate within a limited bandwidth. This paper presents the transmission performance of the orthogonal frequency division multiplexing (OFDM)-based 1024-QAM in multipath fading propagation conditions by link-level simulation, as well as under static propagation condition. The BER performance is investigated for two types of propagation models, i.e., "extended pedestrian A" and "extended vehicular A" models, specified by 3GPP as parameters of the coding rates. The SNR penalties are also described with respect to the case of AWGN with phase error to meet a BER of 10 −2 for OFDM-based 1024-QAM. Using these results, we validate the application of OFDM-based 1024-QAM to mobile communication systems.

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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.…”

mentioning

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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Performance evaluation of OFDM-based 256- and 1024-QAM in multipath fading propagation conditions

Cited by 14 publications

References 7 publications

Performance evaluation of 4-quadrature amplitude modulation over orthogonal frequency division multiplexing system in different fading channels scenarios

Performance evaluation of 4-quadrature amplitude modulation over orthogonal frequency division multiplexing system in different fading channels scenarios

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

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

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