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lteFrequencyCorrect

Frequency offset correction

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Syntax

out = lteFrequencyCorrect(cfg,in,foffset)

Description

example

out= lteFrequencyCorrect(cfg,in,foffset)corrects for a specified frequency offset,foffset, in the time-domain waveform,in, by performing simple frequency modulation (FM). The parameters of the waveform,in, are specified in a settings structure,cfg, which must contain either the fieldNDLRBorNULRBto control whether a downlink or uplink signal is expected inin.

The input,foffset频率偏移,in hertz, present on the waveform,in. Therefore, the correction applied is FM modulation by –foffset.

Examples

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Open Live Script

Perform frequency offset estimation and correction on an uplink signal, to which a frequency offset has been applied.

Generate uplink RMC A3-2.

[txWaveform,rgrid,cfg] = lteRMCULTool('A3-2',[1;0;0;1],'Fdd',2);

Apply an arbitrary frequency offset of 51.2 Hz.

t = (0:length(txWaveform)-1).'/cfg.SamplingRate; txWaveform = txWaveform .* exp(1i*2*pi*51.2*t);

Estimate and display the frequency offset.

offset = lteFrequencyOffset(cfg,txWaveform); disp(['Frequency offset: 'num2str(offset)' Hz'])
Frequency offset: 51.2 Hz

Correct for the frequency offset.

rxWaveform = lteFrequencyCorrect(cfg,txWaveform,offset);

Finally, perform SC-FDMA demodulation.

rxGrid = lteSCFDMADemodulate(cfg,rxWaveform);

Input Arguments

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Waveform parameter settings, specified as a structure.cfgmust contain either the fieldNDLRB, to specify a downlink configuration, or the fieldNULRB, to specify an uplink configuration.

Parameter Field Required or Optional Values Description
NDLRB Required

Positive scalar integer

Number of downlink resource blocks ( N RB DL )

Set this parameter field to specify a downlink configuration.
CyclicPrefix Required

'Normal'(default),'Extended'

Cyclic prefix length in the downlink

Only set this parameter field if you are specifying a downlink configuration.
NULRB Required

Scalar integer from 6 to 110

Number of uplink resource blocks. ( N RB UL )

Set this parameter field to specify an uplink configuration.
CyclicPrefixUL Required

'Normal'(default),'Extended'

Uplink cyclic prefix length. Only set this parameter field if you are specifying an uplink configuration.

Data Types:struct

Time-domain waveform, specified as a numeric column vector.

Data Types:double|single
Complex Number Support:Yes

波形频率偏移, specified as a scalar value expressed in Hertz. The correction applied toinis FM modulation by –foffset.

Data Types:double

Output Arguments

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Offset-corrected waveform, returned as a numeric column vector.

Data Types:double|single
Complex Number Support:Yes

Version History

Introduced in R2014a

See Also

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