Recently, we came across this great paper (link, free PDF) about modeling the impact of multipath on LoRa modulation. Specifically, it models Rayleigh flat fading, which is observed in urban and indoor use-cases. We had just finished testing LoRaWAN vs. Haystack’s LoRa XR2 in an environment with heavy multipath interference (an airport parking garage). The …
Our latest video showing the amazing results here: UPDATE: some technical notes: For both sets of devices we used: Spreading Factor = 1 Coding Rate = 1 Payload = 16 bytes The Haystack XR2 Error Correction used a 1/2 coding rate, which causes data rate to be halved. To control for this variable we set LoRaWAN …
Just in time for CES, STMicro has released a new SoC (System on Chip) that contains an STM32L4 and a LoRa transceiver. Here’s a link to the product page. The long-story-short is that Haystack will be adopting this SoC in our products in 1st half 2020, and it will improve our performance. The STM32WLE chips …
Announcing XR Mode Version 2.0 Some stunning news to share. Earlier this year, we announced an important advance in improving the range performance of Haystack’s DASH7 technology over LoRa — DASH7 XR Mode. Using NASA-derived error correction (and deployed on the New Horizons space probe), we achieved results that were 10–20x better than a comparable …
At Haystack, we are fans of Semtech’s LoRa LPWAN radio. Until recently, we considered the 915 MHz band as too noisy for low power IoT systems, but Semtech’s use of chirp spread spectrum combined with modern silicon capabilities gives them an edge in the growing LPWAN industry. We are particularly bullish on LoRa’s prospects for …
