info

Get characteristic information about link-level MIMO fading channel

Syntax

channelInfo = info(channel)

Description

channelInfo = info(channel) returns characteristic information about the link-level multi-input multi-output (MIMO) fading channel channel.

Examples

Get Characteristic Information About TDL Fading Channel

Create an nrTDLChannel System object.

tdl = nrTDLChannel;

To get characteristic information about the channel, call the info function on the object.

channelInfo = info(tdl)

channelInfo = struct with fields:
          ChannelFilterDelay: 7
                  PathDelays: [0 1.1457e-08 1.2075e-08 1.7604e-08 ... ]
            AveragePathGains: [-13.4000 0 -2.2000 -4 -6 -8.2000 -9.9000 ... ]
             KFactorFirstTap: -Inf
         NumTransmitAntennas: 1
          NumReceiveAntennas: 2
    SpatialCorrelationMatrix: [2x2 double]

Input Arguments

channel — MIMO fading channel

nrCDLChannel | nrTDLChannel

MIMO fading channel, specified as an nrCDLChannel or nrTDLChannel System object™. The objects implement the link-level MIMO fading channels specified in TR 38.901 Section 7.7.1 and Section 7.7.2, respectively.

Output Arguments

channelInfo — Characteristic information of channel model

structure

Characteristic information of channel model, returned as a structure. The fields of the structure depend on the input channel.

• If channel is an nrCDLChannel System object, the channelInfo structure has these fields.

  Parameter Field	Value	Description
  PathDelays	Numeric row vector	Delays of discrete channel paths for each cluster in seconds, returned as a numeric row vector. These values include the effects of DelaySpread scaling and KFactorScaling (when enabled).
  ClusterTypes	Cell array of character vectors	Type of each cluster in the delay profile, returned as a cell array of character vectors. Cluster types can be 'LOS', 'SubclusteredNLOS', or 'NLOS'.
  AveragePathGains	Numeric row vector	Average path gains of the discrete path or clusters in dB, returned as a numeric row vector. These values include the effect of KFactorScaling scaling (when enabled).
  AnglesAoD	Numeric row vector	Azimuth of departure angles of the clusters in degrees, returned as a numeric row vector. These values include the effect of angle scaling if enabled, see the AngleSpreads property.
  AnglesAoA	Numeric row vector	Azimuth of arrival angles of the clusters in degrees, returned as a numeric row vector. These values include the effect of angle scaling if enabled, see the AngleSpreads property.
  AnglesZoD	Numeric row vector	Zenith of departure angles of the clusters in degrees, returned as a numeric row vector. These values include the effect of angle scaling if enabled, see the AngleSpreads property.
  AnglesZoA	Numeric row vector	Zenith of arrival angles of the clusters in degrees, returned as a numeric row vector. These values include the effect of angle scaling if enabled, see the AngleSpreads property.
  KFactorFirstCluster	Numeric scalar	K-factor of first cluster of delay profile in dB, returned as a numeric scalar. If the first cluster of the delay profile follows a Laplacian instead of a Rician distribution, KFactorFirstCluster is -Inf.
  NumTransmitAntennas	Numeric scalar	Number of transmit antenna elements, returned as a numeric scalar.
  NumInputSignals	Numeric scalar	Number of input signals, returned as a numeric scalar. This value determines the number of columns in the input signal sent through the channel (see signalIn). The value of NumInputSignals and NumTransmitAntennas structure fields are equal, unless you specify the transmit antenna as a phased.ReplicatedSubarray (Phased Array System Toolbox) or phased.PartitionedArray (Phased Array System Toolbox) phased array object. In case of these two phased antenna arrays, NumInputSignals is equal to the number of antenna subarrays, so NumInputSignals ≤ NumTransmitAntennas.
  NumReceiveAntennas	Numeric scalar	Number of receive antenna elements, returned as a numeric scalar.
  NumOuputSignals	Numeric scalar	Number of output signals, returned as a numeric scalar. This value determines the number of columns in the output signal received from the channel (see signalOut). The value of NumOutputSignals and NumReceiveAntennas structure fields are equal, unless you specify the receive antenna as a phased.ReplicatedSubarray (Phased Array System Toolbox) or phased.PartitionedArray (Phased Array System Toolbox) phased array object. In case of these two phased antenna arrays, NumOutputSignals is equal to the number of subarrays, so NumOutputSignals ≤ NumReceiveAntennas.
  ChannelFilterDelay	Numeric scalar	Channel filter delay in samples, returned as a numeric scalar.

  Note

  • The step of splitting the strongest clusters into subclusters, described in TR 38.901 Section 7.5, requires sorting of the clusters by their average power. If the NumStrongestClusters property is nonzero (applies only when DelayProfile is set to 'Custom'), the fields of the information structure are sorted by average power. That is, the AveragePathGains, ClusterTypes, PathDelays, AnglesAoD, AnglesAoA, AnglesZoD, and AnglesZoA fields are presented in descending order of the average gain.

  • If the HasLOSCluster property is set to true, the NLOS (Laplacian) part of that cluster and the LOS cluster are not necessarily next to each other. However, the KFactorFirstCluster field still indicates the appropriate K-factor.

• If channel is an nrTDLChannel System object, the channelInfo structure has the following fields.

  Parameter Field	Value	Description
  ChannelFilterDelay	Numeric scalar	Channel filter delay in samples, returned as a numeric scalar.
  AveragePathGains	Numeric row vector	Average path gains of the discrete paths in dB, returned as a numeric row vector. These values include the effect of KFactorScaling (when enabled).
  PathDelays	Numeric row vector	Delays of discrete channel paths in seconds, returned as a numeric row vector. These values include the effects of DelaySpread scaling and KFactorScaling (when enabled).
  KFactorFirstTap	Numeric scalar	K-factor of first tap of delay profile in dB, returned as a numeric scalar. If the first tap of the delay profile follows a Rayleigh instead of a Rician distribution, KFactorFirstTap is -Inf.
  NumTransmitAntennas	Numeric scalar	Number of transmit antennas, returned as a numeric scalar.
  NumReceiveAntennas	Numeric scalar	Number of receive antennas, returned as a numeric scalar.
  SpacialCorrelationMatrix	Numeric matrix	Combined correlation matrix or 3-D array, returned as a numeric matrix.

References

[1] 3GPP TR 38.901. “Study on channel model for frequencies from 0.5 to 100 GHz.” 3rd Generation Partnership Project; Technical Specification Group Radio Access Network.

Extended Capabilities

C/C++ Code Generation
Generate C and C++ code using MATLAB® Coder™.

Version History

Introduced in R2018b