Millimeter Wave MISO-OFDM Transmissions in an Intra-Wagon Environment

Borras, Concepcion Sanchis; Molina‐Garcia‐Pardo, José‐María; Rubio, Lorenzo; Pascual‐García, Juan; Peñarrocha, Vicent Miquel Rodrigo; Llácer, Leandro Juan; Reig, Juan

doi:10.1109/tits.2020.2983028

Cited by 3 publications

(2 citation statements)

References 20 publications

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“…This SNR threshold value was chosen to be able to observe variations in the throughput, since at higher SNRs, no errors occurred for the 38 GHz band. The calculation method applied was described in [ 31 ], with an equivalent isotropic radiated power (EIRP) of −9.3 dBm, and a noise power for the 100, 200, and 400 MHz bandwidths, equal to −89, −86, and −83 dBm, respectively.…”

Section: Resultsmentioning

confidence: 99%

Massive MIMO Indoor Transmissions at 38 and 65 GHz Applying Novel HBF Techniques for 5G

Sanchis-Borras

Martínez-Inglés

Molina‐Garcia‐Pardo

2022

Sensors

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The 5G Infrastructure Public Private Partnership (5GPPP) has recently published a white paper about 5G service indoors, since up to now, it had mainly focused on the outdoors. In an indoor environment, the requirements are different since the propagation mechanism differs from other scenarios. Furthermore, previous works have shown that space frequency block code (SFBC) techniques applied to multiple antennas improve performance compared to single-input single-output (SISO) systems. This paper presents an experimental study in an indoor environment regarding the performance of a massive multiple-input multiple-output (mMIMO) millimeter-wave (mmWave) system based on the 5G New Radio (NR) standard in two frequency bands. In a first step, the 38 and 65 GHz bands are compared by applying a low-complexity hybrid beamforming (HBF) algorithm. In a second step, the throughput and the maximum achievable distance are studied using a new algorithm that combines the SFBC technique and HBF. Results show, at 38 GHz with HBF and aggregated bandwidths (4 × 100 MHz), a maximum throughput of 4.30 Gbit/s up to 4.1 m. At 65 GHz, the SFBC + HBF algorithm improves the communication distance by 1.34, 1.61, or 1.75 m for bandwidths of 100, 200, or 400 MHz, respectively.

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Section: Resultsmentioning

confidence: 99%

Massive MIMO Indoor Transmissions at 38 and 65 GHz Applying Novel HBF Techniques for 5G

Sanchis-Borras

Martínez-Inglés

Molina‐Garcia‐Pardo

2022

Sensors

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“…One of the most critical parameters is the root mean square of the delay spread (RMS DS), which is usually extracted from the power delay profile (PDP); thus, in [5] the RMS DS was estimated for different low mm-Wave subbands whereas in [10] the RMS DS and the angle of arrival were extracted at 2.6 GHz from wideband measurements. Finally, distinct multiple-input multipleoutput (MIMO) configurations and the contribution of dense multipath components were analyzed between 25 and 40 GHz in [11] and [12], respectively.…”

Section: Introductionmentioning

confidence: 99%

Wireless Channel Analysis Between 25 and 40 GHz in an Intra-Wagon Environment for 5G Using a Ray-Tracing Tool

Pascual‐García

Rubio²,

Peñarrocha³

et al. 2022

IEEE Trans. Intell. Transport. Syst.

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Metro and railway systems are one of the most used transportation systems for people in almost all countries. Nevertheless, the access to high throughput wireless services is still very limited inside the wagons (cars). A deep analysis of the wireless channel inside wagons is needed to deploy new efficient and high throughput networks as the ones provided by fifth-generation (5G) systems. Although several works have analyzed the intrawagon channel, some limitations are usually present: only certain user equipment-access point situations were considered, the number of studied propagation mechanisms was limited, and only some channel parameters were extracted. For these reasons, in this work the wireless channel in an intra-wagon environment is thoroughly analyzed using simulations performed with a ray-tracing tool calibrated and validated with wideband measurements. Thanks to the accurate ray-tracing tool the main replicas are identified in different typical user equipment-access point positions; the contribution of each propagation mechanism to the total power is extracted; and the angular spread in azimuth and elevation for the direction of arrival and departure are obtained. This analysis is performed in the frequency range from 25 to 40 GHz, where spectrum for several 5G bands has been already allocated.

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Co-Efficient Vector Based Differential Distributed Quasi-Orthogonal Space Time Frequency Coding

Nwanekezie,

Simpson,

Owojaiye

et al. 2023

Sensors

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Distributed space time frequency coding (DSTFC) schemes address problems of performance degradation encountered by cooperative broadband networks operating in highly mobile environments. Channel state information (CSI) acquisition is, however, impractical in such highly mobile environments. Therefore, to address this problem, designers focus on incorporating differential designs with DSTFC for signal recovery in environments where neither the relay nodes nor destination have CSI. Traditionally, unitary matrix-based differential designs have been used to generate the differentially encoded symbols and codeword matrices. Unitary based designs are suitable for cooperative networks that utilize the amplify-and-forward protocol where the relay nodes are typically required to forego differential decoding. In considering other scenarios where relay nodes are compelled to differentially decode and re-transmit information signals, we propose a novel co-efficient vector differential distributed quasi-orthogonal space time frequency coding (DQSTFC) scheme for decode-and-forward cooperative networks. Our proposed space time frequency coding scheme relaxes the need for constant channel gain in the temporal and frequency dimensions over long symbol periods; thus, performance degradation is reduced in frequency-selective and time-selective fading environments. Simulation results illustrate the performance of our proposed co-efficient vector differential DQSTFC scheme under different channel conditions. Through pair-wise error probability analysis, we derive the full diversity design criteria for our code.

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Millimeter Wave MISO-OFDM Transmissions in an Intra-Wagon Environment

Cited by 3 publications

References 20 publications

Massive MIMO Indoor Transmissions at 38 and 65 GHz Applying Novel HBF Techniques for 5G

Massive MIMO Indoor Transmissions at 38 and 65 GHz Applying Novel HBF Techniques for 5G

Wireless Channel Analysis Between 25 and 40 GHz in an Intra-Wagon Environment for 5G Using a Ray-Tracing Tool

Co-Efficient Vector Based Differential Distributed Quasi-Orthogonal Space Time Frequency Coding

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