In this paper, a channel measurement campaign is introduced, which utilizes direction-scan-sounding to capture the spatial characteristics of 28-GHz wave propagation channels with 500-MHz sounding bandwidth in office environments. Both line-of-sight and non-line-of-sight scenarios were considered. Measurements performed by fixing transmit pyramidal horn antenna, rotating another one receiver site at 10° steps azimuth. The antenna outputs are viewed as array signals, space-alternating...

This paper presents 70-77 GHz wideband channel characteristics of delay, spatial, and polarimetric domains for small office entrance hall scenarios. Based on measured multidimensional power spectra directions (i.e., azimuth elevation) departure arrival, multipath clusters were detected using the K-means, threshold-based, Gaussian-mixture-model clustering algorithms. The spatial positions clusters, including first- last-hop scatterers, are determined a measurement-based ray tracer method. Our...

In this contribution, a stochastic modeling approach is proposed for characterizing the polarization status of multipath components (MPCs) in propagation channels. The 2×2 matrix each MPC represented by geometrical parameters two ellipses, i.e., ovality, tilt angle, and size ellipse, as well rotating direction electric field intensity along ellipse. statistics these including correlation behaviors among them extracted from measurement data constitute model scenario interest. Analytical...

The traffic explosion of mobile communications increasingly requires effective and realistic fifth-generation (5G) channel models. Recently, we have conducted measurement campaigns in lecture hall laboratory scenarios using steerable beam antennas for characterizing 13-17 GHz channels. Space-Alternating Generalized Expectation-maximization (SAGE) algorithm was applied to estimate the multipath components (MPCs) delay angle arrival domains. These estimated MPCs were further grouped into...

A monolithic azimuthal monopulse antenna for 94-GHz applications has been developed. The structure consists of a single dipole suspended in one plane an integrated horn cavity to obtain the sum pattern, and antiparallel pair dipoles different same achieve difference pattern. Pattern measurements microwave models on millimeter-wave antennas show good agreement with theory exhibit symmetry sharp -30-dB null at broadside antenna. Microwave model input impedances close 50 Omega , greater than...

In this paper, the channel of an indoor holographic multiple-input multiple-output (MIMO) system is measured. It demonstrated through experiments for first time that spatial oversampling MIMO systems able to increase capacity a wireless communication significantly. However, antenna efficiency most crucial challenge preventing us from getting improvement. An extended EM-compliant model also proposed systems, which take non-isotropic characteristics propagation environment, pattern distortion,...

Abstract Cooperative communication with spectrum sharing has been proved to be an efficient way reduce energy consumption. In this work, optimal power allocation algorithm is proposed for mobile cooperative beamforming networks, where several secondary users (SUs) collaboratively act as relay nodes assist the transmission of a primary user (PU) in reward transmitting their own information. The scheme obtained by solving convex optimization problem aiming at minimizing network consumption...

In this contribution, a high-resolution parameter estimation algorithm is derived based on the Space-Alternating Generalized Expectation-maximization (SAGE) principle for extracting multipath parameters from output of sliding correlator (SC). The SC allows calculating channel impulse responses with sampling rate less than that required by Nyquist criterion, and hence widely used in real-time wideband (e.g., >500 MHz) sounding fifth generation wireless communication scenarios. However, since...

In this contribution, both theoretical studies and measurement results are reported for investigating the anisotropic property of propagation channels with respect to (w.r.t.) (linear) polarizations transmitter (Tx) receiver (Rx) antennas. Under assumption that channel impulse response (CIR) is polarization isotropic, analytical expressions derived K-factor delay spread as functions Tx-Rx polarizations, furthermore, our deduction also shows rank signal subspace spanned by a multi-polarized...

A maximum-likelihood-estimation method is proposed for extracting the attitude of a sectoring base station (BS) antenna by using received signal strengths observed multiple user equipments (UEs) in this contribution. This calculates likelihood function derived taking into account multiscale fading statistics, that is, path loss, shadowing, and multipath fading. Depending on whether calibration result these statistics available or not, can be utilized either calibration-based estimation (CBE)...

Cooperative communication with spectrum sharing has been proved as an efficient way to reduce energy consumption. In this work, we address the problem of best relay selection and optimal power allocation. system model, secondary user (SU) acts assist in transmission primary (PU) reward transmit its own information. On one hand, SU is selected using metric efficiency by considering outage capacity consumption a decoding forward (DF) relaying. other allocation obtained from solving convex...

In this contribution, a maximum-likelihood-based approach is proposed for estimating the attitudes of sectoring base station (BS) antennas based on power received signals observed by multiple user equipments (UEs) in cellular network. The method calculates likelihood antenna attitude taking into account both large-scale fading statistics, i.e. path loss, shadowing, and small-scale attributed to multi-path propagation. performance evaluated simulations urban rural scenarios, where...

A channel measurement campaign is introduced which makes use of direction-scan-sounding (DSS) to capture the spatial characteristics higher-frequency-band (HFB) wave propagation with center frequency 15 GHz in classroom environments. The transmitter (Tx) equipped an omni-directional antenna, while receiver (Rx) a pyramidal horn antenna either 10° - or 30°-half-power-beamwidth (HPBW) different scenarios. Measurements are performed by fixing Tx and rotating Rx antenna's axis azimuth arrival...

In this contribution, a channel measurement campaign was carried out which employed directional scanning approach to capture the temporal and spatial characteristics of higher-frequency-band (HFB) wave propagation ranging from 13 17 GHz in lecture hall environments. The omni-directional antenna equipped transmitter (Tx), horn certain half-power-beamwidth (HPBW) installed receiver (Rx) side rotated during measurements. Space-Alternating Generalized Expectation-maximization (SAGE) algorithm...

In this paper, the channel of an indoor holographic multiple-input multiple-output (MIMO) system is measured. It demonstrated through experiments for first time that spatial oversampling MIMO systems able to increase capacity a wireless communication significantly. However, antenna efficiency most crucial challenge preventing us from getting improvement. An extended EM-compliant model also proposed systems, which take non-isotropic characteristics propagation environment, pattern distortion,...

The emergence of 5G and 5G-Advanced (5G-A) communication networks brings new features capabilities, such as simultaneous use multiple frequency bands. Precise reasonable channel models in a real propagation environment are essential for evaluating multi-band cooperative algorithms. In this work, measurement campaign characterizing large- small-scale channels was conducted indoor industrial scenarios. Firstly, large-scale measurements were performed to characterize path-loss shadow fading the...

6G-7G Hz (U6G) is one promising frequency band and will be utilized in 5G evolution period, but this has been occupied by non-terrestrial network (NTN) networks some countries. The interference assessment between NTN services U6G of key issues needed to considered before the large-scale deployment evolution. Therefore, clutter loss (CL) model pivotal different systems co-existence evaluations. ITU-R issued a Recommendation (ITU-R P.2108) giving CL for estimation at three terminal...