Something with nRF52832

[Wwing]

Dear team:

 1.So how can I increase transmission withou improving TX power  As for the transmission distance of nRF52832, apart from improving the TX power, what is the better way to improve the transmission distance? At present, I use ESB protocol. The transmission frequency is 4 dBm, and 2.45G frequency band  transmits 16K, 16bit data

2.In the mode configuration of Radio, there are nRF_ 2Mbit and BLE_2Mbit. What is the difference between these two modes?

[bjorn-spockeli]

Hi Cfsediej,

 

1.So how can I increase transmission withou improving TX power  As for the transmission distance of nRF52832, apart from improving the TX power, what is the better way to improve the transmission distance? At present, I use ESB protocol. The transmission frequency is 4 dBm, and 2.45G frequency band  transmits 16K, 16bit data

 On the nRF52832 there is not much you can do to improve the range besides increasing the TX output power. On the nRF52840, nRF52833 and nRF52811 there is are 125 kbps BLE mode and 500 kbps BLE mode with better RX sensitivity, see Receiver operation in the nRF52833 Product Specification. 

2.In the mode configuration of Radio, there are nRF_ 2Mbit and BLE_2Mbit. What is the difference between these two modes?

There are several differences w.r.t to the two 2Mbit modes, including Frequency deviation, RX selectivity, RX intermodulation, Adjacent Channel Transmit Power  and  Receiver sensitivity ,  see the Electrical specification  section in the nRF52832 Product specification.

Its mainly the RX sensitivity that affects the range and as you can see below, the BLE radio modes have better sensitivity than the nRF Radio modes.

Symbol	Description	Typ.	Units
PRX,MAX	Maximum received signal strength at < 0.1% BER	0	dBm
PSENS,IT,1M	Sensitivity, 1Msps nRF mode1	-93	dBm
PSENS,IT,SP,1M,BLE	Sensitivity, 1Msps BLE ideal transmitter, <=37 bytes BER=1E-32	-96	dBm
PSENS,IT,LP,1M,BLE	Sensitivity, 1Msps BLE ideal transmitter >=128 bytes BER=1E-4 3	-95	dBm
PSENS,IT,2M	Sensitivity, 2Msps nRF mode4	-89	dBm
PSENS,IT,SP,2M,BLE	Sensitivity, 2Msps BLE ideal transmitter, Packet length <=37bytes	-93	dBm
PSENS,DT,SP,2M,BLE	Sensitivity, 2Msps BLE dirty transmitter, Packet length <=37bytes	-93	dBm
PSENS,IT,LP,2M,BLE	Sensitivity, 2Msps BLE ideal transmitter >= 128bytes	-92	dBm
PSENS,DT,LP,2M,BLE	Sensitivity, 2Msps BLE dirty transmitter, Packet length >= 128bytes	-92	dBm

[Wwing]

Hi,Bjorn;

thanks a lots, another questions:

1.How many meters can nRF52832 at the nRF Radio   2.4G  bands up to the maximum TX output power(4dBm)? And how many  the BLE radio ?

2.In this case,What is the transmission rate in this case?

[bjorn-spockeli]

Wwing said:

1.How many meters can nRF52832 at the nRF Radio   2.4G  bands up to the maximum TX output power(4dBm)? And how many  the BLE radio ?

 That depends on the environment that its operating in, e.g. if its outdoor with clear line of sight or if its indoors with lots of obstacles and interference. Did not understand the last question. 

Wwing said:

2.In this case,What is the transmission rate in this case?

 Do you mean the nRF52832 transmission rate? The on-air rate is 1Mbps, but the actual Link Layer throughput will vary depending on the method used to transmit the data, e.g. Write command, write request, notification etc, see Bluetooth Low Energy data throughput

[Wwing]

Hi bjorn:

 thanks  So I want ask that How long the distance  can nrf52832 transmit  upto the maximum TX output power in an open and unobstructed and non interference environment? Is there any measured data？

[bjorn-spockeli]

We did a test with the nRF52840, in 2018 where we used the 1Mbps PHY with the RADIO transmitting at 0dBm. We managed to maintain the link over 681.90m

see https://devzone.nordicsemi.com/nordic/nordic-blog/b/blog/posts/testing-long-range-coded-phy-with-nordic-solution-it-simply-works-922075585. 

The sensitivity of the nRF52840 RADIO is more or less the same as the nRF52832 RADIO in 1M PHY mode so the results are comparable. 

Note that the signal strength at this range is very low, about -93dBm so for a actual product i would recommend having some headspace, e.g. 5 dBm above the sensitivity of the RADIO. 

[Wwing]

Ok, I got it, thank you very much