LAUNCHXL-CC1310: Unacceptable Error Rates Above 750 Kbps @ 920 Mhz

johny radio

Part Number: LAUNCHXL-CC1310
Other Parts Discussed in Thread: CC1310, SYSCONFIG, CC1190

Can you point me in the direction of a solution for some issues I have about the CC1310 simplelink transceiver?

I’m specifically interested in figuring out settings to achieve some of its higher supported data rates. On the datasheet the part is specified as supporting up to 4 Mbps max, but it seems that the device control panel software in SmartRF studio only provides typical settings up to 800kbps.

I have a pair of CC13010 dev boards. We're bench-testing them with Smart RF Studio.

At 915-920 Mhz, i'm getting very low error-rate up to about 800 kbps, and then error-rate suddenly goes through the roof, both BIT error rate, and packet error rate.

Settings:

RSSI: -20 dBm
3767 Khz recv filter bw
32 byte preamble
255 byte packet length
4 byte sync word
2 byte sequence number

Configuration export files are available here.
/cfs-file/__key/communityserver-discussions-components-files/156/smartrf_5F00_best800kbps.zip

Result:

400 Kbps: 0 errors
600 Kbps: 0 errors
700 Kbps: 0 bit error rate (ber), 25% packet error rate (per)
750 Kbps: 0 ber, 2.6% per
800 Kbps:
- 127 packet: 0.02% ber, 17% per
- 250 packet: 0.02% ber, 30% per
810 Kbps: 0.2% ber, 86% per

Generally, we find a longer preamble on npn module gives better performance.

Another issue: RF Studio only allows up to 1.99 Mbps

over 2 years ago

+1 TER over 2 years ago

TI__Guru**** 317180 points

For above ~600 kbps the high speed phy has to be used and not the prop phy. The high speed phy just have a few possible datarates.

If you search on the forum you will find 1 Mbps which is basically using very similar phy to BLE and 1.5 Mbps. 4 Mbps is supported in the PER example found in the SDK.

0 johny radio over 2 years ago in reply to TER

Intellectual 820 points

Fantastic info. I will explore. Thx!

Will SysConfig support 4 Mbps?

0 TER over 2 years ago in reply to johny radio

TI__Guru**** 317180 points

The examples for CC1310 is setup without syscfg.

0 johny radio over 2 years ago in reply to TER

Intellectual 820 points

We were able to run the PER example, setting test-case to HS Mode. The receiver reported 4 Mbps.

However, according to the doc:

# rfPacketErrorRate
HSM and OOK are not supported on the CC1310-CC1190
https://dev.ti.com/tirex/explore/node?node=AAH5pdKIQF7AwxOZbakjeg__eCfARaV__LATEST

What does that mean? That seems to contradict our test (and your answer).

0 TER over 2 years ago in reply to johny radio

TI__Guru**** 317180 points

Are you using the CC1190?

I have only answered based on using CC1310 only.

0 johny radio over 2 years ago in reply to TER

Intellectual 820 points

I know. You said CC1310 supports 4 Mbps.

We had to use HS mode to achieve 4 Mbps on CC1310.

But, the doc says CC1310 doesn't support HS mode.

Is the doc wrong?

0 TER over 2 years ago in reply to johny radio

TI__Guru**** 317180 points

You are referring to "HSM and OOK are not supported on the CC1310-CC1190".

It's the combination of CC1310 + CC1190 (CC1310-CC1190) that does not support HSM and OOK. CC1310 supports these modes

0 johny radio over 2 years ago in reply to TER

Intellectual 820 points

Ok, i understand. Is there a range-extender chip compatible with CC1310 that supports HSM?

thx

0 TER over 2 years ago in reply to johny radio

TI__Guru**** 317180 points

It's not a combability issue as such but a regulation issue.

For ETSI the channel where 27 dBm is allowed is 250 kHz wide. A HSM or OOK signal will have a OBW that is wider than this and will therefore not pass.

0 johny radio over 2 years ago in reply to TER

Intellectual 820 points

Since we are limited on transmitter power, what solutions to increase sensitivity of CC1310 receiver?

0 TER over 2 years ago in reply to johny radio

TI__Guru**** 317180 points

Since you have a lot of different question: Could you describe your system requirements?

0 johny radio over 2 years ago

Intellectual 820 points

System requirement:

4 Mbps + long range. No ARQ or ACK (broadcast-only), no back-channel. At least approx 2 Mbps data-rate.

0 TER over 2 years ago in reply to johny radio

TI__Guru**** 317180 points

You can't get long range and high datarate at the same time. Have you tested https://www.ti.com/tool/RF-RANGE-ESTIMATOR?

Why do you need 4 Mbps?

0 johny radio over 2 years ago in reply to TER

Intellectual 820 points

Trust me, we need high data-rate (about 2 Mbps). Outdoors, need at least 200 meters NLOS.

We tested CC1310 indoors, PER example in HSM, at about 15 meters, got about 2 Mbps throughput at about 2% PER.

Not too bad, but want to decrease PER with FEC or other methods.

Can't use CC1310 native FEC, as half data-rate (1 Mbps) is too slow.

0 TER over 2 years ago in reply to johny radio

TI__Guru**** 317180 points

All type of coding will decrease the effective bit rate since more than 1 bit is used to code 1 bit.

0 johny radio over 2 years ago in reply to TER

Intellectual 820 points

Yes, but not necessarily 2:1. (Might be helpful to other visitors if we keep FEC comments on my FEC topic)

Thx

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LAUNCHXL-CC1310: Unacceptable Error Rates Above 750 Kbps @ 920 Mhz