How to configure NR 100MHz with SDR50 cards ?

 

Amarisoft PCIe SDR50 card supports up to 56MHz band width. By bundling two PCIe SDR cards, it is possible to reach 100MHz bandwidth if you have multiple sdr50 cards. To support NR 100MHz system bandwidth using PCIe SDR card, we divide the total bandwidth to two sub bands of 50MHz. This mode is called "stereo mode"

| 100MHz |----------------------------------| low 50MHz | high 50MHz |

Each sub band is mapped to an rf port. As consequence each sub band is managed as an independent rf port.

NOTE : For a specific tutorial utilizing this configuration, click here

 

NR 100MHz 2x2 stereo mode

For 100Mhz 2x2 in stereo mode, the spectrum is divided into two sub bands of 50MHz. Each sub band is considered as an independent cell 50MHz 2x2. So we need two SDR cards, each SDR card is in charge of 50MHz 2x2.

Here is the configuration of the two sub bands.

rf_ports: [ { /* RF port for the NR cell */ sample_rate: 61.44, /* MHz */ n_subband: 2, }, ],

Here is the mapping of layers/band width to SDR ports.

sdr0.tx1 => TX1 low 50MHz

sdr0.tx2 => TX2 low 50MHz

sdr1.tx1 => TX1 high 50MHz

sdr1.tx2 => TX2 high 50MHz

 

NR 100MHz 4x4 stereo mode

Equally, for 100Mhz 4x4 in stereo mode, the spectrum is divided into two sub bands of 50MHz. Each sub band is considered as an independent cell 50MHz 4x4. So we need four SDR cards, each couple SDR card is in charge of 50MHz 4x4.

Here is the configuration of the two sub bands.

rf_ports: [ { /* RF port for the NR cell */ sample_rate: 61.44, /* MHz */ n_subband: 2, }, ],

Here is the mapping of layers/band width to SDR ports.

sdr0.tx1 => TX1 low 50MHz

sdr0.tx2 => TX2 low 50MHz

sdr1.tx1 => TX3 low 50MHz

sdr1.tx2 => TX4 low 50MHz

sdr2.tx1 => TX1 high 50MHz

sdr2.tx2 => TX2 high 50MHz

sdr3.tx1 => TX3 high 50MHz

sdr3.tx2 => TX4 high 50MHz