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CC1312R: Subchannels and bandwidth allocation

Eirini Eleni Tsiropoulou
Prodigy 10 points
Part Number: CC1312R
Other Parts Discussed in Thread: CC1352R, , CC1260

Hi!

We are checking the capabilities of the transmitter of the TI CC1312R and TI CC1352R modules in the band  861-1054 MHz. 

This is a band with available bandwidth 193 MHz to be used by the transmitter. If I have multiple TICC1312R  transmitting at the same time, and I am using the Non-Orthogonal Multiple Access (NOMA) technique, there will be interference sensed at the receiver. In the case that I would like to use the Orthogonal Frequency Division Multiple Access (OFDMA) technique, am I able with this wireless module to subdivide the 193 MHz available bandwidth to subchannels and allocate the subchannels to the transmitters in order to decrease the interference? If yes, what is the length of each subchannel in MHz or KHz, what is the guarding space between adjacent subchannels, and how many subchannels are available? 


Are the TI CC1312R and TI CC1352R modules reprogrammable to allow me to allocate dynamically the aforementioned subchannels to different transmitters, so they solely transmit to the specific subchannel. My experiment is mainly focusing on dynamic bandwidth allocation in NOMA and OFDMA multiple access communication environments.

  • 0
    TI__Mastermind 18015 points

    Hi,

    Apologies for the delay - the CC13x2 devices do not support OFDM-based modulation schemes, so would not be suitable for this.

    You might want to look at the CC1260 RF front end (https://www.ti.com/product/CC1260) to see if it could be more suitable for your application. 

    Regards,

    Zack

  • 0 in reply to ZC
    Prodigy 10 points

    Thank you for your answer!

    We checked the specs of CC1260 (BTW in the provided link, the link for the datasheet is broken -- we found the datasheet here: https://www.mouser.com/catalog/specsheets/txii-s-a0011474260-1.pdf). It seems that, for example, the CC1260RGZR has a maximum transmission/output power  +13dBm and it can operate in two frequency bands: 902-930 and 863-876MHz. The channel bandwidth is for the transmission 3MHz (see 4.5 RF Characteristics, pg 7). I would like to clarify the following:

    1. Can the module transmit simultaneously in both bands? Meaning, 902-930 and 863-876MHz?

    2. How many channels does each of the bands have, considering the channel bandwidth (we don't know how much is the bandwidth guard among the channels)?

    3. Can you clarify why the minimum channel bandwidth for the receiver and the transmitter are different, i.e., 2 MHz and 3 MHz, respectively?

    4. What is the value of sensitivity in dBm for this module, i.e., CC1260RGZR, that is the minimum power that it can sense?

    Thank you in advance for your time and consideration. Your input is very valuable!

  • 0 in reply to Eirini Eleni Tsiropoulou
    TI__Mastermind 18015 points

    Apologies for the delay on this, there are a couple of your questions that I still need to check. However, please see the second section of my reply as we will likely need more information on your application before being able to provide satisfactoy answers.

    1. Can the module transmit simultaneously in both bands? Meaning, 902-930 and 863-876MHz?

    The CC1260 is half-duplex, so cannot TX on both bands simultaneously.

    4. What is the value of sensitivity in dBm for this module, i.e., CC1260RGZR, that is the minimum power that it can sense?

    The RX Sensitivity depends on the PHY being used, so parameters such as bit rate, RX BW, and the frequency of operation will affect this.

    Regarding the CC1260 and the support we currently provide:

    We do not typically promote this part since this requires extensive support to finalise and develop the modem with an external DSP. In order to send any further documentation on CC1260, we will require more information regarding the volumes and end customer application. If an NDA is signed we can provide the datasheet and user manual.

    I do not have enough information from your account to contact your local TI sales representative and/or local FAE; if you provide more information in your account (it is not public) I can do this, or you can contact them yourself as an alternative.

    Regards,

    Zack