Issue link: https://read.uberflip.com/i/1423190
LoRa Alliance ® Whitepaper Page 27 of 49 LoRaWAN ® Gateways Radio Coexistence Issues and Solutions Copyright ©2021 LoRa Alliance, Inc. All rights reserved. www.lora-alliance.org For the IM3 product estimation, we are going to consider the following assumptions: • The LoRaWAN transmitter is configured at maximum output power, i.e.: o +14dBm or +27dBm at RF port in Europe o +30dBm at RF port in North America o +27dBm at RF port in APAC and LATAM • OIP3 at the LoRa RF port is +40dBm. • LTE BS level at the LoRaWAN gateway RF port is +3dBm, according to §3.3.6. • An LTE BS channel of 5MHz BW. The power is therefore +3dBm - 10*Log(5/0.1) = -14dBm in 100KHz BW. • Isolation between the LTE BS antenna and LoRa antenna is 45dB, according to §3.3.6. • Isolation between the LoRa antenna and LTE backhauling ports of the LoRaWAN gateways is 35dB. • LTE UL level (from gateway backhaul) at the LoRaWAN gateway RF port is +21 - 35 = -14dBm • An LTE UL channel of 5MHz BW. The power is therefore -14dBm - 10*Log(5/0.1) = -31dBm in 100KHz BW. • IMD3 products are evaluated with RBW = 100KHz. • IMD3 is calculated according to calculator [3]. • IMD3 products must be below -124dBm/100KHz in a receive band of any receiver port to avoid desensitization. • IMD3 products must be below -54dBm/100KHz in the 470 – 790 MHz band at the LoRa RF port to meet ETSI EN 300 200. • IMD3 products must be below -36dBm/100KHz or -30dBc/100KHz in other bands at the LoRa RF port to meet ETSI EN 300 200 and 47 CFR FCC Part 15 specifications.