lteHSTChannel

High-speed train MIMO channel propagation conditions

Syntax

out = lteHSTChannel(model,in)

Description

out = lteHSTChannel(model,in) implements the high-speed train (HST) MIMO channel model specified in TS 36.101 [1] and TS 36.104 [2]. The high-speed train propagation condition is composed of a non-fading single path of unit amplitude and zero phase with a changing Doppler shift. The columns of matrix in correspond to the channel input waveforms at each transmit antenna. The channel model filters in with the characteristics specified in structure model. The matrix out stores the filtered waveform. Each column of out corresponds to the waveform at one of the receive antennas.

Examples

Model High-Speed Train Propagation Channel

Generate a frame and filter it with the high-speed train channel model.

Create a reference channel configuration structure initialized to 'R.10'. Generate a waveform.

rmc = lteRMCDL('R.10');
[txWaveform,txGrid,info] = lteRMCDLTool(rmc,[1;0;1]);

Initialize a propagation channel configuration structure for high-speed train profile. Pass the transmission waveform through the propagation channel.

chcfg.NRxAnts = 1;
chcfg.Ds = 100;
chcfg.Dmin = 500;
chcfg.Velocity = 350;
chcfg.DopplerFreq = 5;
chcfg.SamplingRate = info.SamplingRate;
chcfg.InitTime = 0;

rxWaveform = lteHSTChannel(chcfg,txWaveform);

Input Arguments

model — High-speed train propagation channel model

structure

High-speed train propagation channel model, specified as a structure containing these fields.

Parameter Field	Required or Optional	Values	Description
NRxAnts	Required	Positive scalar integer	Number of receive antennas
Ds	Required	Numeric scalar	Train-to-eNodeB double initial distance, in meters. Ds/2 is initial distance between train and eNodeB, in meters
Dmin	Required	Scalar value	eNodeB to railway track distance, in meters
Velocity	Required	Scalar value	Train velocity, in kilometers per hour
DopplerFreq	Required	Scalar value	Maximum Doppler frequency, in Hz.
SamplingRate	Required	Scalar value	Input signal sampling rate, the rate of each sample in the rows of the input matrix, in.
InitTime	Required	Scalar value	Doppler shift timing offset, in seconds
NormalizeTxAnts	Optional	'On' (default), 'Off'	Transmit antenna number normalization, specified as: 'On', lteHSTChannel normalizes the model output by 1/sqrt(P), where P is the number of transmit antennas. Normalization by the number of transmit antennas ensures that the output power per receive antenna is unaffected by the number of transmit antennas. 'Off', normalization is not performed.

Data Types: struct

in — Channel input waveforms at transmit antennas

numeric matrix

Channel input waveforms at transmit antennas, specified as a numeric matrix. in has size T-by-P, where P is the number of antennas and T is the number of time-domain samples. These waveforms are filtered with the high-speed train channel model with the Doppler shift as specified in parameter structure model.

Data Types: double | single
Complex Number Support: Yes

Output Arguments

out — Filtered waveform

numeric matrix

Filtered waveform, returned as a numeric matrix. Each column of out corresponds to the waveform at one of the receive antennas.

Data Types: double | single
Complex Number Support: Yes

References

[1] 3GPP TS 36.101. “Evolved Universal Terrestrial Radio Access (E-UTRA); User Equipment (UE) Radio Transmission and Reception.” 3rd Generation Partnership Project; Technical Specification Group Radio Access Network. URL: https://www.3gpp.org.

[2] 3GPP TS 36.104. “Evolved Universal Terrestrial Radio Access (E-UTRA); Base Station (BS) Radio Transmission and Reception.” 3rd Generation Partnership Project; Technical Specification Group Radio Access Network. URL: https://www.3gpp.org.

Version History

Introduced in R2013b