Performance of a Non-Coherent Massive SIMO M-DPSK System

Baeza, Víctor Monzón; Armada, Ana García; El‐Hajjar, Mohammed; Hanzo, Lajos

doi:10.1109/vtcfall.2017.8288015

Cited by 15 publications

(11 citation statements)

References 9 publications

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“…However, the quality of the system is degraded as the Doppler frequency is increased, where the worst performance corresponds to f d = 1600Hz. In any case, for reasonably moderate values of f d , the performance degradation is negligible as anticipated in [10].…”

Section: Numerical Resultssupporting

confidence: 53%

“…However, this scheme is implemented with single-carrier modulation (SCM), assuming that the channel is flat-fading and remains invariant over a longenough coherence time. The effect of time-varying channels is also analyzed in [10] for the case of SCM systems, where it is concluded that the non-coherent scheme is robust to fast time variability of the channel.…”

Section: Introductionmentioning

confidence: 99%

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Non-Coherent Multiuser Massive MIMO-OFDM with Differential Modulation

Chen‐Hu

Armada

2019

ICC 2019 - 2019 IEEE International Conference on Communications (ICC)

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Massive multiple-input multiple-output (MIMO) and orthogonal frequency division multiplexing (OFDM) are wireless technologies adopted by the Fifth Generation (5G) of mobile communications. The channel estimation and pre/postequalization processes in coherent detection schemes for massive MIMO-OFDM are a challenging task, where several issues are faced, such as pilot contamination, channel calibration, matrix inversions, among others. Moreover, they increase the energy consumption and latency of the system. A non-coherent technique relying on DPSK constellation has been proposed for a singlecarrier scheme, assuming flat-fading. In our paper, we extend this technique to be combined with OFDM, where the channel is doubly dispersive (time and frequency). We will show that the differential modulation can be performed either in the time or frequency domain, where the latter suffers from an additional phase rotation, which should be estimated and compensated. We provide the analytical expression of the signal-to-interferenceand-noise ratio (SINR) for both cases, and we show numerical results in order to verify our analysis.

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Section: Numerical Resultssupporting

confidence: 53%

Section: Introductionmentioning

confidence: 99%

Non-Coherent Multiuser Massive MIMO-OFDM with Differential Modulation

Chen‐Hu

Armada

2019

ICC 2019 - 2019 IEEE International Conference on Communications (ICC)

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“…Even though in this paper we do not show the performance in time-varying channels, it has been shown in[24] that the non-coherent DPSK-based massive MIMO is very robust to the time variability of the channel.…”

mentioning

confidence: 67%

Non-Coherent Massive MIMO-OFDM Down-Link Based on Differential Modulation

Chen‐Hu

Liu

Armada

2020

IEEE Trans. Veh. Technol.

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Orthogonal frequency division multiplexing (OFDM) and multiple-input multiple-output (MIMO) are wireless radio technologies adopted by the new Fifth Generation (5G) of mobile communications. A very large number of antennas (massive MIMO) is used to perform the beam-forming of the transmitted signal, either to reduce the multi-user interference (MUI), when spatially multiplexing several users, or to compensate the path-loss when higher frequencies than microwave are used, such as the millimeter-waves (mm-Waves). Usually, a coherent demodulation scheme (CDS) is used in order to exploit MIMO-OFDM, where the channel estimation and the pre/post-equalization processes are complex and time consuming operations, which require a considerable pilot overhead and also increase the latency of the system. As an alternative, non-coherent techniques based on a differential modulation scheme have been proposed for the up-link (UL). However, it is not straightforward to extend these proposals to the down-link (DL) due to the (usually) reduced number of antennas at the receiver side. In this paper we overcome this problem, and assuming that each user equipment (UE) is only equipped with one single antenna, we propose the combination of beam-forming with a differential modulation scheme for the DL, enhanced by the frequency diversity. The new transmission and reception schemes are described, and the signal-to-interference-plus-noise ratio (SINR) and the complexity are analysed. The numerical results verify the accuracy of the analysis and show that our proposal outperforms the existing CDS with a significant lower complexity.

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“…Consequently, the choice of the individual constellation is crucial to produce a robust joint-constellation against interference and noise effects. The most used constellations are the Type B [12] and equal error protection (EEP) [13]. The constellation of the -th UE can be expressed as…”

Section: Multi-user Multiplexing In the Constellation Domainmentioning

confidence: 99%

Non-coherent massive MIMO-OFDM for communications in high mobility scenarios

Chen‐Hu¹,

Liu²,

Armada³

2020

ITU J-FET

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Under scenarios of high mobility, the traditional coherent demodulation schemes (CDS) have a limited performance, due to the fact that reference signals cannot effectively track the variations of the channel with an affordable overhead. As an alternative solution, non coherent demodulation schemes (NCDS) based on differential modulation have been proposed. Even in the absence of reference signals, they are capable of outperforming the CDS with a reduced complexity. The literature on NCDS laid the theoretical foundations for simplified channel and signal models, often single carrier and spatially uncorrelated flat fading channels. In this work, the most recent results assuming orthogonal frequency division multiplexing (OFDM) signaling and realistic channel models are explained, and the impact of some hardware impairments such as the phase noise (PN) and the non linear high power amplifier (HPA) are also considered. Moreover, new potential research lines are also highlighted.

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Performance of a Non-Coherent Massive SIMO M-DPSK System

Cited by 15 publications

References 9 publications

Non-Coherent Multiuser Massive MIMO-OFDM with Differential Modulation

Non-Coherent Multiuser Massive MIMO-OFDM with Differential Modulation

Non-Coherent Massive MIMO-OFDM Down-Link Based on Differential Modulation

Non-coherent massive MIMO-OFDM for communications in high mobility scenarios

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