gsmInfo
View GSM waveform information
Description
returns a structure containing characteristic waveform information for the input GSM
configuration object.infostruct
= gsmInfo(gsmCfg
)
Examples
View GSM Configuration Object Information
View information from downlink and uplink GSM configuration objects.
Create a GSM downlink configuration object with default settings and use gsmInfo
to view the waveform information structure.
cfgDL = gsmDownlinkConfig; infostructDL = gsmInfo(cfgDL)
infostructDL = struct with fields:
SymbolRate: 2.7083e+05
SampleRate: 4.3333e+06
BandwidthTimeProduct: 0.3000
BurstLengthInSymbols: 156.2500
NumBurstsPerFrame: 8
BurstLengthInSamples: 2500
FrameLengthInSamples: 20000
Create a GSM uplink configuration object with default settings and use gsmInfo
to view the waveform information structure.
cfgUL = gsmUplinkConfig; infostructUL = gsmInfo(cfgUL)
infostructUL = struct with fields:
SymbolRate: 2.7083e+05
SampleRate: 4.3333e+06
BandwidthTimeProduct: 0.3000
BurstLengthInSymbols: 156.2500
NumBurstsPerFrame: 8
BurstLengthInSamples: 2500
FrameLengthInSamples: 20000
Create GSM Uplink Waveform Containing Five TDMA Frames
Create a GSM downlink TDMA frame configuration object with default settings, and then create a GSM waveform containing five TDMA frames. GSM TDMA frames have eight time slots, each separated by a guard period of 8.25 symbols or about 30.46x10e-3 ms. Plot the GSM waveform.
Create a GSM uplink TDMA frame configuration object, specifying 3 dB of attenuation in the last time slot to help identify the end of each frame.
cfggsmul = gsmUplinkConfig('Attenuation',[0 0 0 0 0 0 0 3])
cfggsmul = gsmUplinkConfig with properties: BurstType: [NB NB NB NB NB NB NB NB] SamplesPerSymbol: 16 TSC: [0 1 2 3 4 5 6 7] Attenuation: [0 0 0 0 0 0 0 3] PulseLength: 4 RiseTime: 2 RiseDelay: 0 FallTime: 2 FallDelay: 0
Display information about the configured gsmUplinkConfig
object by using the gsmInfo
function. Assign the frame length in samples to a variable, spf
, for use in computing the plot timescale.
wfInfo = gsmInfo(cfggsmul)
wfInfo = struct with fields:
SymbolRate: 2.7083e+05
SampleRate: 4.3333e+06
BandwidthTimeProduct: 0.3000
BurstLengthInSymbols: 156.2500
NumBurstsPerFrame: 8
BurstLengthInSamples: 2500
FrameLengthInSamples: 20000
spf = wfInfo.FrameLengthInSamples;
Create the GSM waveform by using the gsmFrame
function, and then plot the GSM waveform. The last time slot of each frame is 3 dB less than the other time slots in that frame.
numFrames = 5; waveform = gsmFrame(cfggsmul,numFrames); t = 8*(0:length(waveform)-1)/spf; numTS = 8*numFrames; subplot(2,1,1) plot(t,abs(waveform)) grid on axis([0 numTS 0 1.2]) title('GSM Uplink Waveform - Amplitude') xlabel('Time Slots') ylabel('Amplitude') subplot(2,1,2) plot(t,unwrap(angle(waveform))) grid on title('GSM Uplink Waveform - Phase') xlabel('Time Slots') ylabel('Phase (rad)')
Input Arguments
gsmCfg
— GSM configuration
gsmUplinkConfig
object | gsmDownlinkConfig
object
GSM configuration, specified as a gsmUplinkConfig
or gsmDownlinkConfig
object.
Output Arguments
infostruct
— Structure containing object information
struct
Structure containing these fields with information about the characteristic GSM waveform based on the input configuration object.
SymbolRate
— GSM symbol rate
positive integer
GSM symbol rate in symbols per second, returned as a positive integer.
SampleRate
— GSM sample rate
positive integer
GSM sample rate in samples per second, returned as a positive integer.
BandwidthTimeProduct
— Product of bandwidth and symbol time of Gaussian pulse
positive integer
Product of bandwidth and symbol time of Gaussian pulse for the GMSK modulator, returned as a positive integer.
BurstLengthInSymbols
— GSM burst length
positive scalar
GSM burst length in symbols, returned as a positive scalar.
NumBurstsPerFrame
— Number of bursts in GSM TDMA frame
positive integer
Number of bursts in a GSM TDMA frame, returned as a positive integer.
BurstLengthInSamples
— GSM burst length
positive integer
GSM burst length in samples, returned as a positive integer.
FrameLengthInSamples
— GSM frame length
positive integer
GSM frame length in samples, returned as a positive integer.
Extended Capabilities
C/C++ Code Generation
Generate C and C++ code using MATLAB® Coder™.
Version History
Introduced in R2019b
See Also
Objects
Functions
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