info

Return characteristic information about channel filter

Since R2020b

Syntax

infostruct = info(chanFilt)

Description

infostruct = info(chanFilt) returns a structure containing characteristic information about the comm.ChannelFilter System object™.

Examples

Determine Channel Filter Structure Dimensions

In a distributed MIMO system, send the same signal from two geographically separate transmitters (Tx) and combine the received signals at one single receiver (Rx) to explore spatial diversity. The two Txs are not co-located and they experience different multipath (path delays) to the Rx. Specify the path delays respectively.

delay1 = [0 1.5 2.3 5.2 6.6];
delay2 = [0 3.7 6.2];

Configure one channel filter object per Tx.

chanFilt1 = comm.ChannelFilter('PathDelays', delay1);
chanFilt2 = comm.ChannelFilter('PathDelays', delay2);

Use the info object function to get the ChannelFilterDelay and ChannelFilterCoefficients.

info(chanFilt1)

ans = struct with fields:
    ChannelFilterCoefficients: [5x21 double]
           ChannelFilterDelay: 6

info(chanFilt2)

ans = struct with fields:
    ChannelFilterCoefficients: [3x19 double]
           ChannelFilterDelay: 4

Input Arguments

chanFilt — Channel filter

System object

Channel filter, specified as a comm.ChannelFilter System object.

Output Arguments

infostruct — Characteristic information about channel filter

struct

Characteristic information about channel filter, returned as a structure containing these fields:

ChannelFilterDelay — Excess filter delay

positive integer

Excess filter delay in samples, returned as a positive integer.

• If you configure the PathDelays property of your channel object with all integer-valued delays, the implemented channel filter adds no excess delay to the channel output. In this case, the ChannelFilterDelay field reports 0 for the excess path delay.

• If you configure the PathDelays property of your channel object with any noninteger-valued delays, the implemented channel filter may add excess delay to the channel output. In this case, the ChannelFilterDelay field may report a nonzero value for the excess path delay.

Data Types: double

ChannelFilterCoefficients — Channel filter coefficients

vector | matrix

Channel filter coefficients, returned as a vector or a matrix.

Data Types: double

Version History

Introduced in R2020b