Carrier Configuration

NI-RFmx Waveform Creator User Guide 2.4

Edition Date: November 2017

Part Number: 377063C-01

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Fig. 1-49 Carrier Configuration


This section allows you to configure the top-level modulation parameters of the LAA Signal. The Carrier Configuration section comprises the following controls.

Link Direction

Specifies the link direction of the signal being generated.

Number of Frames

Specifies the number of radio frames that will be generated. The valid range is 1 to 2. The Number of Frames is calculated based on the burst configuration. If the burst spans across 2 frames, then Number of Frames is set to 2.

For example, if the starting Subframe is 5 and Number of Subframes is 10, then 2 frames will get generated.

Channel Bandwidth

Specifies the system bandwidth of the LTE signal. Valid values are 1.4 MHz, 3 MHz, 5 MHz, 10 MHz, 15MHz, and 20 MHz. The default value is 10 MHz. The relationship of bandwidth to number of resource blocks is shown in Table 1-6.

System bandwidth BWChannel [MHz]  1.4  10  15  20 
Number of resource blocks   6  15  25  50  75  100

Table 1-21 Relationship between System Bandwidth and number of RBs

Cell ID

Defines the physical layer cell identity. The range is 0 to 503. The default value is 0.

Oversampling Factor

Defines the oversampling factor that is to be used in the simulation. When the Auto checkbox is selected, the oversampling rate is adjusted automatically.

Cyclic Prefix Mode

Specifies the Cyclic Prefix type of the signal being generated. LAA supports Normal Cyclic Prefix.

Note: Cyclic Prefix Mode control is read-only.

Burst Configuration

Starting Subframe

Specifies the starting subframe of an LAA burst. Valid range is from 0 to 9. The default value is 0.

Number of Subframes

Specifies the number of subframes in an LAA burst including the starting subframe. Valid range is from 1 to 10. The default value is 10.

Start Position (Uplink)

Specifies the starting position of symbol0 in the first subframe of an LAA uplink bursts.The default value is 00.

00(0)  The symbol 0 in the first subframe of an LAA uplink burst is completely occupied. There is no idle duration. 
01(1)  The starting position of symbol0 in the first subframe of an LAA uplink burst is calculated as per the section 5.6 (frame structure type 3) of the 3GPP 36.211 specification. The symbol is partially occupied. 
10(2)  The starting position of symbol0 in the first subframe of an LAA uplink burst is calculated as per the section 5.6 (frame structure type 3) of the 3GPP 36.211 specification. The symbol is partially occupied. 
11(3)  The starting position of symbol0 in the first subframe of an LAA uplink burst is calculated as per the section 5.6 (frame structure type 3) of the 3GPP 36.211 specification. The symbol is partially occupied. 

Table 1-22

Ending Symbol (Uplink)

Specifies the ending symbol number in the last subframe of an LAA uplink burst. Refer to section 5.3.3.1.1A of the 3GPP specification 36.212 for more information about the LAA uplink ending symbol. The default value is s13.

s12(0)  The last subframe of an LAA uplink burst ends at symbol 12. 
s13(1)  The last subframe of an LAA uplink burst ends at symbol 13. 

Table 1-23

NTA (Uplink)

Specifies the timing offset between uplink and downlink radio frames at the UE. This attribute is expressed in units of Ts. It is used to calculate the starting position of symbol0 in the first subframe of an LAA uplink burst when the Start Position is set to 10. Valid range is from 0 to (N+Ncp,0)-768. Refer to section 5.3.3.1.1A of the 3GPP specification 36.212 for more information about LAA uplink ending symbol.

Starting Symbol (Downlink)

Specifies the starting symbol number in the first subframe of an LAA downlink burst. Refer to section 13A of the 3GPP specification 36.213 for more information regarding LAA downlink starting symbol. The default value is S0.

S0(0)  The first subframe of an LAA downlink burst starts with symbol 0. 
S07(1)  The first subframe of an LAA downlink burst starts with symbol 7. 

Table 1-24

Number of Ending Symbols (Downlink)

Specifies the number of ending symbols in the last subframe of an LAA downlink burst. Refer to section 4.3 of the 3GPP specification 36.211 for more information about LAA downlink number of ending symbols. The default value is 14.

3(0)  The number of ending symbols in the last subframe of an LAA downlink burst is 3. 
6(1)  The number of ending symbols in the last subframe of an LAA downlink burst is 6. 
9(2)  The number of ending symbols in the last subframe of an LAA downlink burst is 9. 
10(3)  The number of ending symbols in the last subframe of an LAA downlink burst is 10. 
11(4)  The number of ending symbols in the last subframe of an LAA downlink burst is 11. 
12(5)  The number of ending symbols in the last subframe of an LAA downlink burst is 12. 
14(6)  The number of ending symbols in the last subframe of an LAA downlink burst is 14. 

Table 1-25

Time Domain Windowing

Time domain windowing is not mandatory in the LTE standards. The window function is employed to reduce out-of-band spectrum emissions.

State

Defines whether the Time Domain Windowing function will be applied to the simulation. If this control is selected, Windowing will be employed. The default is selected (enabled).

Duration

This is the time interval of the time domain windowing. By default, it is set to 500 ns. Increasing the transition time increase the spectrum roll-off at the cost of a decreased delay spread tolerance.

Note: To prevent rounding/truncation of the overlap samples, it is advisable to enter values multiples of 100 ns.

The transition time range is 0 to 4600 ns.

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