A CP Reduction Scheme Based on Symbol Repetition for Narrow-Band IoT Systems

Kong, Dejin; Xu, You; Song, Guochao; Li, Jian; Jiang, Tao

doi:10.1109/jiot.2021.3063732

Cited by 8 publications

(8 citation statements)

References 28 publications

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“…The implementation of the RF at the physical-layer of NB-IoT systems has received considerable attention. The work in [2] has proposed a unique Cyclic Prefix (CP) reduction technique to decrease the overhead of frequent CPs due to repetitions. In [3], frame repetitions were adopted to achieve the self-cancellation in FBMC/OQAM systems.…”

Section: Introductionmentioning

confidence: 99%

“…Contrarily to the works in [2], [3], [7]- [9], that have characterized the capacity or the coverage assuming deterministic assumptions, the main contribution of our work is the characterization of the trade-off between NB-IoT's coverage and capacity in a stochastic way. We consider the non-Gaussian interference caused by dominant nodes communicating in the same band, assuming non-deterministic path-loss according to the spatial distribution of the nodes and Rician fading channel in both DL and UL scenarios.…”

Section: Introductionmentioning

confidence: 99%

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The Importance of Repetitions in Ultra-Dense NB-IoT Networks

2022

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This letter investigates the influence of the number of repetitions adopted in the NB-IoT standard to increase cellular coverage. We characterize the SINR in both uplink and downlink channels of ultra-dense networks, which is then used to derive the coverage probability and the NB-IoT's capacity. The performance results show the effectiveness of the number of repetitions to reduce the block error rate for different densities of transmitters.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The Importance of Repetitions in Ultra-Dense NB-IoT Networks

2022

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“…In recent years, 5G-enabled internet of things (5G-IoT) have attracted much attention due to the features of low cost, low power consumption, and wide coverage, which put forward a challenge on the modulation technique. As it is well known, orthogonal frequency division multiplexing (OFDM) is one classical modulation technique and has been widely applied in many communication standards due to the low implementation complexity and ability to fight against multipath channels [1][2][3]. However, as one of multicarrier modulations, OFDM suffers from the problem of high peak to average power ratio (PAPR), which severely impairs the efficiency of power amplifiers and is unfavourable for the features of low power consumption and wide coverage.…”

Section: Introductionmentioning

confidence: 99%

A Novel Modulation Technique with Low PAPR for 5G-IoT Systems

Sun

Chen

Ding

et al. 2022

Wireless Communications and Mobile Computing

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For existing orthogonal frequency division multiplexing (OFDM) in 5G internet of things (5G-IoT) systems, one of the critical problems is the high peak to average power ratio (PAPR), which seriously degrades the energy efficiency. To this end, we propose a novel modulation technique with low PAPR for IoT systems, which preserves the advantage of low implementation complexity and ability to fight against multipath channels. The key methodology is the employment of symbol repetition in the frequency domain. Hence, by designing the appropriate phase factors on the repeated symbols, the PAPR of transmitted signals is equivalent to that of an OFDM signal with a reduced size of discrete Fourier transform (DFT). It is demonstrated that, even if there exists repetitive symbols, the proposed method can still maintain an unreduced spectral efficiency performance. Moreover, to evaluate the proposed method, the Monte-Carlo simulations are conducted for the complementary cumulative distribution function (CCDF) and the bit error rate under multipath fading channels. The simulations show that, as CCDF = 10 − 3 , the proposed method can achieve 2.5 dB gains about the PAPR compared with the original OFDM signal.

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“…Nevertheless, in widely FD orthogonal frequency division multiplexing (OFDM) systems, cyclic prefix (CP), the one in charge of eliminating the interference, decreases the SE [5]. Through the literature, several attempts have been made to enhance the SE, and [5][6][7] aim to reduce the CP without distortion. However, due to imposition of the local transmitter signal on the local receiver, the strong self-interference (SI) also blocks the SE [8], and none of the designs [5][6][7] managed to remove CP in FD systems.…”

Section: Introductionmentioning

confidence: 99%

“…Through the literature, several attempts have been made to enhance the SE, and [5][6][7] aim to reduce the CP without distortion. However, due to imposition of the local transmitter signal on the local receiver, the strong self-interference (SI) also blocks the SE [8], and none of the designs [5][6][7] managed to remove CP in FD systems. Therefore, our focus in this paper is to design CP-free FD system while limit the effect of SI.…”

Section: Introductionmentioning

confidence: 99%

A Full-Duplex MIMO System Based on CP-Free OFDM in Sensor Network

Jiang

Chen

2022

Journal of Sensors

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Recently, results have shown that full-duplex (FD) system based on orthogonal frequency division multiplexing (OFDM) is potential for wireless sensor networks. However, extending FD to further improve spectral efficiency by removing cyclic prefix (CP) with optimal canceling self-interference (SI) remains a challenge. In this paper, we analytically study the conventional FD OFDM system and proposed a CP-free system on this basis. The key point of the proposed scheme is the symbols transmitted in a unit of two identical symbols without CP. To eliminate the intersymbol interference, the disturbed part are replaced by the repeated signal at the receiver, which has the same effect as CP. Finally, an SI cancellation is down to restore the transmitted symbols. As a key of analysis, a multiple-input multiple-output (MIMO) FD simulation model is carried to show that our proposed scheme is effectiveness in terms of the bit error ratio (BER).

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A CP Reduction Scheme Based on Symbol Repetition for Narrow-Band IoT Systems

Cited by 8 publications

References 28 publications

The Importance of Repetitions in Ultra-Dense NB-IoT Networks

The Importance of Repetitions in Ultra-Dense NB-IoT Networks

A Novel Modulation Technique with Low PAPR for 5G-IoT Systems

A Full-Duplex MIMO System Based on CP-Free OFDM in Sensor Network

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