Static CDL

classDiagram direction LR class CDL { _realize() : CDLRealization } class CDLRealization { _sample() : CDLSample } class ClusterDelayLineSample { propagate(Signal) : Signal } CDL --o CDLRealization : realize() CDLRealization --o ClusterDelayLineSample : sample() click CDL href "#hermespy.channel.cdl.cdl.CDL" click CDLRealization href "#hermespy.channel.cdl.cdl.CDLRealization" click ClusterDelayLineSample href "cluster_delay_lines.html#hermespy.channel.cdl.cluster_delay_lines.ClusterDelayLineSample"

class CDL(model_type, rms_delay, rayleigh_factor=0.0, decorrelation_distance=30.0, **kwargs)

Bases: Channel[CDLRealization, ClusterDelayLineSample]

Static cluster delay line model for link-level simulations.

Parameters:

• model_type (CDLType) – Type of the cluster delay line model.

• rms_delay (float) – Root mean square delay spread of the channel.

• rayleigh_factor (float) – Rayleigh K-factor of the channel.

• decorrelation_distance (float) – Decorrelation distance of the channel.

• **kwargs – Additional parameters for the base class.

_realize()

Generate a new channel realzation.

Abstract subroutine of realize. Each Channel is required to implement their own _realize() method.

Returns: A new channel realization.

Return type:

CDLRealization

recall_realization(group)

Recall a realization of this channel type from its HDF serialization.

Parameters:

group (h5py.Group) – HDF group to which the channel realization was serialized.

Return type:

CDLRealization

Returns: The recalled realization instance.

property decorrelation_distance: float

Decorrelation distance of the channel.

Raises:

ValueError – If the decorrelation distance is negative.

property model_type: CDLType

Type of the cluster delay line model.

property rayleigh_factor: float

Rayleigh K-factor of the channel.

Raises:

ValueError – If the K-factor is negative.

property rms_delay: float

Root mean square delay spread of the channel.

Raises:

ValuError – If the delay spread is negative.

class CDLRealization(type, rms_delay, rayleigh_factor, angle_coupling_indices, consistent_realization, xpr_phase, sample_hooks, gain)

Bases: ChannelRealization[ClusterDelayLineSample]

Realization of a static cluster delay line model for link-level simulations.

Generated by the realize method of the CDL class.

Parameters:

• type (CDLType) – Type of the cluster delay line model.

• rms_delay (float) – Root mean square delay spread of the channel.

• rayleigh_factor (float) – Rayleigh K-factor of the channel.

• angle_coupling_indices (ndarray) – Indices for the coupling of rays within a cluster.

• consistent_realization (ConsistentRealization) – Realization of the consistent distribution.

• xpr_phase (ConsistentUniform) – Realization of the cross-polarization phase.

• sample_hooks (Set[ChannelSampleHook[ClusterDelayLineSample]]) – Hooks to be called after the channel sample has been generated.

• gain (float) – Linear channel gain factor.

static From_HDF(group, xpr_phase, sample_hooks)

Return type:

CDLRealization

_sample(state)

Sample the channel realization at a given point in time and space.

Abstract subroutine of sample.

Parameters:

state (LinkState) – State of the channel at the time of sampling.

Return type:

ClusterDelayLineSample

Returns: The channel sample at the given point in time.

to_HDF(group)

Serialize the channel realization to HDF5.

Parameters:

group (Group) – HDF5 group to serialize the channel realization to.

Return type:

None

class CDLType(value, names=None, *, module=None, qualname=None, type=None, start=1, boundary=None)

Bases: SerializableEnum

Type of the static cluster delay line model.

A = 0

B = 1

C = 2

D = 3

E = 4