dichasus-cf1x-part2 Dataset: Distributed Antenna Setup in Industrial Environment, Day 2, Second Part

Distributed antenna setup with line-of-sight (LoS) and non-line-of-sight (NLoS) channels, measured in the Arena2036 research factory campus environment.

Four antenna arrays with 8 antennas each distributed at the corners of an L-shaped area with a scatterer in between. Due to a technical problem, 11 antennas (part of arrays B, C and D) are missing from the dataset.

50.000 MHz

Signal Bandwidth

1024

OFDM Subcarriers

128091

Data Points

6427.3 s

Total Duration

22.1 GB

Total Download Size

21

Number of Antennas

Indoor

Type of Environment

1.272000 GHz

Carrier Frequency

Distributed

Antenna Setup

3D Tachymeter

Position-Tagged

Experiment Setup

Data Analysis

Antenna Configuration

Antenna 1: Antenna Array A

This array has a vertical spacing of 0.118m and a horizontal spacing of 0.118m. In the dataset's cartesian coordinate system, its center is located at [2.6747 -13.8973 1.560075] and the antenna points in direction [-0.4499506 0.89246853 0.03231686].
Antenna Channel Assignments
3 1 10 12
17 2 4 8

Antenna 2: Antenna Array B

This array has a vertical spacing of 0.118m and a horizontal spacing of 0.118m. In the dataset's cartesian coordinate system, its center is located at [-11.250275 -9.689025 1.5336] and the antenna points in direction [0.79575318 0.60534027 0.01843999].
Antenna Channel Assignments
14 9
19 13 16

Antenna 3: Antenna Array C

This array has a vertical spacing of 0.118m and a horizontal spacing of 0.118m. In the dataset's cartesian coordinate system, its center is located at [-1.531375 -15.0595 1.5772] and the antenna points in direction [0.21108544 0.97732106 0.0169259].
Antenna Channel Assignments
0 6
7 20 18

Antenna 4: Antenna Array D

This array has a vertical spacing of 0.118m and a horizontal spacing of 0.118m. In the dataset's cartesian coordinate system, its center is located at [-12.684425 -4.483325 1.78985] and the antenna points in direction [0.99369031 -0.08476847 0.073443].
Antenna Channel Assignments
5
15 11

Python: Import with TensorFlow

#!/usr/bin/env python3
import tensorflow as tf

raw_dataset = tf.data.TFRecordDataset(["tfrecords/dichasus-cf13.tfrecords", "tfrecords/dichasus-cf14.tfrecords", "tfrecords/dichasus-cf15.tfrecords", "tfrecords/dichasus-cf16.tfrecords", "tfrecords/dichasus-cf20.tfrecords"])

feature_description = {
	"cfo": tf.io.FixedLenFeature([], tf.string, default_value = ''),
	"csi": tf.io.FixedLenFeature([], tf.string, default_value = ''),
	"gt-interp-age-tachy": tf.io.FixedLenFeature([], tf.float32, default_value = 0),
	"pos-tachy": tf.io.FixedLenFeature([], tf.string, default_value = ''),
	"snr": tf.io.FixedLenFeature([], tf.string, default_value = ''),
	"time": tf.io.FixedLenFeature([], tf.float32, default_value = 0),
}
			
def record_parse_function(proto):
	record = tf.io.parse_single_example(proto, feature_description)

	# Measured carrier frequency offset between MOBTX and each receive antenna.
	cfo = tf.ensure_shape(tf.io.parse_tensor(record["cfo"], out_type = tf.float32), (21))

	# Channel coefficients for all antennas, over all subcarriers, real and imaginary parts
	csi = tf.ensure_shape(tf.io.parse_tensor(record["csi"], out_type = tf.float32), (21, 1024, 2))

	# Time in seconds to closest known tachymeter position. Indicates quality of linear interpolation.
	gt_interp_age_tachy = tf.ensure_shape(record["gt-interp-age-tachy"], ())

	# Position of transmitter determined by a tachymeter pointed at a prism mounted on top of the antenna, in meters (X / Y / Z coordinates)
	pos_tachy = tf.ensure_shape(tf.io.parse_tensor(record["pos-tachy"], out_type = tf.float64), (3))

	# Signal-to-Noise ratio estimates for all antennas
	snr = tf.ensure_shape(tf.io.parse_tensor(record["snr"], out_type = tf.float32), (21))

	# Timestamp since start of measurement campaign, in seconds
	time = tf.ensure_shape(record["time"], ())

	return cfo, csi, gt_interp_age_tachy, pos_tachy, snr, time
			
dataset = raw_dataset.map(record_parse_function, num_parallel_calls = tf.data.experimental.AUTOTUNE)

# Optional: Cache dataset in RAM for faster training
dataset = dataset.cache()

Reference Channel Compensation

For this dataset, we are able to provide estimated antenna-specific carrier phase and sampling time offsets. These offsets occur due to the fact that the reference transmitter channel is not perfectly frequency-flat. To learn more about why these offsets occur and about their compensation, visit our offset calibration tutorial on this topic. Note that the estimates provided here are "best-effort" calculations. The phase and time offsets between antennas in the same array are usually very accurate, but for antennas that are spaced far apart, the results may be less precise. The offset are constant over the complete dataset.

How to Cite

Please refer to the home page for information on how to cite any of our datasets in your research. For this dataset in particular, you may use the following BibTeX:

@data{dataset-dichasus-cf1x-part2,
	author    = {Euchner, Florian and Gauger, Marc},
	publisher = {DaRUS},
	title     = {{CSI Dataset dichasus-cf1x-part2: Distributed Antenna Setup in Industrial Environment, Day 2, Second Part}},
	doi       = {doi:10.18419/darus-3151},
	url       = {https://doi.org/doi:10.18419/darus-3151},
	year      = {2022}
}

Download

This dataset consists of 5 files. Descriptions of these files as well as download links are provided below.

dichasus-cf13
Textual Description

Robot drives along L-shaped meanders from one end of the area to the other.

4.6 GB

File Size

26464

Points

1349.7 s

Duration

dichasus-cf14
Textual Description

Robot trajectory follows some more meanders, different types in different sub-areas.

6.1 GB

File Size

35640

Points

1803.9 s

Duration

dichasus-cf15
Textual Description

Robot trajectory traces several symbols: INUE letters, heart, star, spiral. Slow robot movement.

2.2 GB

File Size

12702

Points

630.1 s

Duration

dichasus-cf16
Textual Description

Robot first slowly drives around the measurement area, then trajectory becomes a zigzag pattern inside the measurement area.

9.2 GB

File Size

53087

Points

2633.7 s

Duration

dichasus-cf20
Textual Description

The transmitter is static somehwere in the middle of the measurement area, the environment is also static.

0.0 GB

File Size

198

Points

9.9 s

Duration

Derived Channel Statistics

Channel statistics such as delay spread, k-Factor and path loss exponent are a good way to characterize a wireless channel measurement and to parametrize a channel model. Using estimation algorithms contributed by Janina Sanzi, we automatically extract the following channel statistics from the measured datasets:

RMS Delay Spread

The delay spread of a wireless channel is inversely proportional to the channel's coherence bandwidth and indicates how "spread out" the lengths of the various multipath propagation paths are. For every datapoint, the delay spread can be characterized by its root mean square value and the resulting delay spreads can be plotted over the measurement area:

Rician K-Factor

The Rician K-factor is defined as the power ratio between dominant and diffuse component, usually expressed in decibels. We estimate the K-factor with a moment-method based on the distribution of of channel coefficient powers. The resulting K-Factors be plotted over the measurement area: