Non-Coherent Open-Loop MIMO Communications Over Temporally-Correlated Channels

Cabrejas, Jorge; Roger, Sandra; Calabuig, Daniel; Fouad, Yaser M. M.; Gohary, Ramy H.; Monserrat, José F.; Yanıkömeroğlu, Halim

doi:10.1109/access.2016.2580680

Cited by 11 publications

(8 citation statements)

References 18 publications

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“…In any case, when the number of antennas at the BS is very large, the design of constellation and/or code blocks for all these techniques becomes unaffordable. In [34], a comparison of different schemes is provided, where only two and four transmit antennas are taken into account. For this setting, the results show that GC slightly outperforms the other schemes in low-Doppler shift scenarios.…”

Section: A Literature Reviewmentioning

confidence: 99%

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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Section: A Literature Reviewmentioning

confidence: 99%

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

Chen‐Hu

Liu

Armada

2020

IEEE Trans. Veh. Technol.

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“…Moreover, they proposed the idea of multiplexing the data of each user equipment (UE) in the constellation domain based on a joint-symbol, which is a superposition of the symbols sent by several UEs. In the case of DL, the combination of NCDS with MIMO has been until now based on block codes [27] - [31]. However, their application requires that the channel response remains quasi-static during the transmission of a block code, and they also need a high SNR in order to provide an acceptable performance.…”

Section: Non-coherent Demodulation Schemes (Ncds)mentioning

confidence: 99%

“…Moreover, they have the problem that they are not scalable and when the number of antennas at the BS is very large, the design of these block codes becomes unaffordable. Typically, only two and four transmit antennas are taken into account [27] - [31]. More recently, the combination of beamforming and NCDS has been proposed in order to exploit the high number of antennas through compensating the path loss and enhancing the quality of the link, and spatially multiplexing the different UEs [18], [19].…”

Section: Non-coherent Demodulation Schemes (Ncds)mentioning

confidence: 99%

“…The exploitation of the diversity from the transmitter without the knowledge of the CSI is still a challenge. Due to the fact that techniques based on block codes [27] failed to exploit the large number of antennas at the transmitter, we propose the use of beamforming in order to take advantage of the massive number of antennas of the BS at the expense of using some (reduced) channel knowledge. Then, it is assumed that the angular positions of each UE are obtained through a beam management procedure to point the beams towards each UE.…”

Section: Beamformingmentioning

confidence: 99%

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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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“…In [13], a subset of well-known non-coherent techniques, including GCs, were compared with several state-of-art trainingbased coherent schemes over temporally-correlated Rayleighfading MIMO channels in a simplified simulation setup. Such comparison showed that non-coherent schemes are meaningful alternatives to training-based communication, especially as the number of transmit antennas increases.…”

Section: Introductionmentioning

confidence: 99%

On the integration of Grassmannian Constellations into LTE networks: A link-level performance study

Cabrejas

Martín‐Sacristán

Roger

et al. 2017

2017 13th International Wireless Communications and Mobile Computing Conference (IWCMC)

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This paper presents Grassmannian signaling as a transmission scheme that can be integrated in Long Term Evolution (LTE) to support higher user speeds and to increase the throughput achievable in the high Signal to Noise Ratio (SNR) regime. This signaling is compared, under realistic channel assumptions, with the diversity transmission modes standardized in LTE, in particular, Space-Frequency Block Coding and Frequency-Switched Transmit Diversity for two and four transmit antennas, respectively. In high-speed scenarios, and even with high antenna correlation, Grassmannian signaling outperforms the LTE diversity transmission modes starting from four transmit antennas. Furthermore, in the high SNR regime, Grassmannian signaling can increase the link data rate up to 10% and 15% for two and four antennas, respectively.

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Non-Coherent Open-Loop MIMO Communications Over Temporally-Correlated Channels

Cited by 11 publications

References 18 publications

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

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

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

On the integration of Grassmannian Constellations into LTE networks: A link-level performance study

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