Signals: Custom OFDM

This topic describes the Signal Optimizer's default Favorite Settings for a Custom OFDM signal format.

Signal Information

Waveform Name

Enter an alpha-numeric waveform file name. The name can include spaces and some special characters: _ $ & # + - [ ]. The maximum name length is 22 characters for non-Windows based instruments (e.g., N5182A, etc.), and 150 characters for Windows based instruments. (If you enter a name with more than the maximum name length, the software truncates the name to the length when you click outside of the cell.)

Comment

Enter an alpha-numeric comment of up to 32 characters. The comment resides in the file header and can include spaces and special characters.

Number Of Frames

Enter the number of frames included in the waveform.

Range: 1-300

Over Sampling Ratio

Enter the oversampling ratio of the waveform. The Total Sample Points is automatically determined based on the oversampling ratio.

Range: 2-16

Mirror Spectrum

Enable or disable the mirror spectrum for the waveform.

Sample Points

Display the number of sample points in the waveform. This value is read-only and will be automatically updated with waveform setting change. Waveform length is directly related to the oversampling ratio value selected. (Increasing the oversampling ratio increases the total sample points.)

Signal Length

Display the waveform length in seconds. This value is read-only and will be automatically updated with waveform setting change.

Sample Rate

Display the sample rate of the signal. This value is read-only and will be autotmaically calculated from symbol rate and over sampling rate.

Signal Setup

FFT Length

Enter the FFT length used for OFDM transmission. The value must be even. Usually the value is a power of two.

Range: 4 - 16384

Guard Interval

Enter the guard interval (cyclic prefix length) in percent of the symbol length.

Range: 0 - 1

Guard Lower Subcarriers

Enter the number of lower guard subcarriers. These subcarriers will be ignored - they will not appear in any results, the modulation and resource type are undefined.

Range: 0 - FFT Length / 2

Guard Upper Subcarriers

Enter the number of upper guard subcarriers. These subcarriers will be ignored - they will not appear in any results, the modulation and resource type are undefined.

Range: 0 - FFT Length / 2

System Sample Frequency

Set the signal sampling rate in Hz. All the subbands will share the same sampling rate.

Range: 1 kHz - 4 GHz (The minimum sampling rate is also determined by the total bandwidth of subbands.)

Resource 1

Name

Enter the name of the resource block.

Enabled

Enable or disable the selected resource block in the waveform.

Choices: On | Off

Resource Mapping

Select the mapping type of the resource block.

Choices: Pilot | Preamble | Data

Boost Level

Set the amplitude boost level for the modulated symbols in the resource block, in linear value. e.g. original symbol 1+i with boost level 2.5 will be 2.5+2.5i.

Range: 0.1 - 10

Resource 2

Name

Enter the name of the resource block.

Enabled

Enable or disable the selected resource block in the waveform.

Choices: On | Off

Resource Mapping

Select the mapping type of the resource block.

Choices: Pilot | Preamble | Data

Boost Level

Set the amplitude boost level for the modulated symbols in the resource block, in linear value. e.g. original symbol 1+i with boost level 2.5 will be 2.5+2.5i.

Range: 0.1 - 10

Resource 3

Name

Enter the name of the resource block.

Enabled

Enable or disable the selected resource block in the waveform.

Choices: On | Off

Resource Mapping

Select the mapping type of the resource block.

Choices: Pilot | Preamble | Data

Boost Level

Set the amplitude boost level for the modulated symbols in the resource block, in linear value. e.g. original symbol 1+i with boost level 2.5 will be 2.5+2.5i.

Range: 0.1 - 10

Resource Modulation

Select the modulation scheme used for the resource block.

Choices: BPSK | QPSK | 8PSK | 16QAM | 32QAM | 64QAM | 128QAM | 256QAM | 512QAM | 1024QAM | 2048 QAM | 4096QAM

Modulation Phase Rotation

Set an additional phase rotation in degrees to the modulated symbols in the resource block.

Range: 0 - 360

Multiple Access Scheme

Select the multiple access scheme for current data block.

Choices: Off | SCMA | NOMA

Payload

Payload Type

Selects data type used as payload of the segment

Choices: PN9 | PN15 | PN23 | Pattern | From User File

Pattern Bits

Enter the payload pattern up to 128 kbits

User File Name

Enter the file name to load for user-defined payload data

Resource 4

Name

Enter the name of the resource block.

Enabled

Enable or disable the selected resource block in the waveform.

Choices: On | Off

Resource Mapping

Select the mapping type of the resource block.

Choices: Pilot | Preamble | Data

Boost Level

Set the amplitude boost level for the modulated symbols in the resource block, in linear value. e.g. original symbol 1+i with boost level 2.5 will be 2.5+2.5i.

Range: 0.1 - 10

Resource Modulation

Select the modulation scheme used for the resource block.

Choices: BPSK | QPSK | 8PSK | 16QAM | 32QAM | 64QAM | 128QAM | 256QAM | 512QAM | 1024QAM | 2048 QAM | 4096QAM

Modulation Phase Rotation

Set an additional phase rotation in degrees to the modulated symbols in the resource block.

Range: 0 - 360

Multiple Access Scheme

Select the multiple access scheme for current data block.

Choices: Off | SCMA | NOMA

Payload

Payload Type

Selects data type used as payload of the segment

Choices: PN9 | PN15 | PN23 | Pattern | From User File

Pattern Bits

Enter the payload pattern up to 128 kbits

User File Name

Enter the file name to load for user-defined payload data.

SCMA Settings

Number of Layers

Set the number of layers (V) for SCMA.

Range: 1-8

Spreading Factor

Set the spreading factor (K) for SCMA.

Range: 1-6

Code Word Size

Set the codeword size (M) for SCMA.

Range: 2-64

Layer 1

Enabled

Enable current SCMA layer

Data Offset

Set the data offset of the payload data.

Range: 0-1000

Payload

Payload Type

Selects data type used as payload of the segment.

Choices: PN9 | PN15 | PN23 | Pattern | From User File

Pattern Bits

Enter the payload pattern up to 128 kbits.

User File Name

Enter the file name to load for user-defined payload data.

NOMA Settings

Noma User 1

Modulation

Select the modulation scheme used for the current Noma User.

Choices: BPSK | QPSK | 8PSK | 16QAM | 32QAM | 64QAM | 128QAM | 256QAM | 512QAM | 1024QAM | 2048 QAM | 4096QAM

Boost Level

Set the amplitude boost level for current NOMA user.

Range: 0.1-10

Data Offset

Set the data offset of the payload data.

Range: 0-1000

Payload

Payload Type

Selects data type used as payload of the segment.

Choices: PN9 | PN15 | PN23 | Pattern | From User File

Pattern Bits

Enter the payload pattern up to 128kbits.

User File Name

Enter the file name to load for user defined payload data.

Resource 5

Name

Enter the name of the resource block.

Enabled

Enable or disable the selected resource block in the waveform.

Choices: On | Off

Resource Mapping

Select the mapping type of the resource block.

Choices: Pilot | Preamble | Data

Boost Level

Set the amplitude boost level for the modulated symbols in the resource block, in linear value. e.g. original symbol 1+i with boost level 2.5 will be 2.5+2.5i.

Range: 0.1 - 10

Pilot Data Mode

Select the data mode for pilot. Pilot pattern can be defined in two ways: user can input pilot IQ values directly, or specify the payload bits with a modulation scheme.

Choices: Payload Bit | IQ Values

Resource Modulation

Select the modulation scheme used for the resource block.

Choices: BPSK | QPSK | 8PSK | 16QAM | 32QAM | 64QAM | 128QAM | 256QAM | 512QAM | 1024QAM | 2048 QAM | 4096QAM

Modulation Phase Rotation

Set an additional phase rotation in degrees to the modulated symbols in the resource block.

Range: 0 - 360

Payload

Payload Type

Selects data type used as payload of the segment.

Choices: PN9 | PN15 | PN23 | Pattern | From User File

Pattern Bit

Enter the payload pattern up to 128kbits.

User File Name

Enter the file name to load for user defind payload data.