PATEL 2. Detection Coherent detection Non-coherent detection 3. It is then possible to reproduce the transmitted signal and demodulate. Total views 48, On Slideshare 0. From embeds 0. Number of embeds 1. Downloads Shares 0. Comments 0. Likes You just clipped your first slide! Clipping is a handy way to collect important slides you want to go back to later.
Forums New posts Search forums. Best Answers. Media New media New comments Search media. Blogs New entries New comments Blog list Search blogs. Groups Search groups. Log in Register. Search only containers. Search titles only. Search Advanced search…. New posts. The technology is used for communication systems such as telemetry, weather balloon radiosondes, caller ID, garage door openers, and low frequency radio transmission in the VLF and ELF bands.
BFSK uses a pair of discrete frequencies to transmit binary 0s and 1s information. Both ASK modulation and demodulation processes are relatively inexpensive. The ASK technique is also commonly used to transmit digital data over optical fiber. For LED transmitters, binary 1 is represented by a short pulse of light and binary 0 by the absence of light. In physics, two wave sources are coherent if their frequency and waveform are identical.
Therefore, in this work, we examine the performance of the LoRa modulation with coherent detection in the presence of interference from another LoRa user with the same spreading factor. We derive rigorous symbol- and frame error rate FER expressions as well as bounds and approximations for evaluating the error rates. The error rates predicted by these approximations are compared against error rates found by Monte Carlo simulations and shown to be very accurate.
We also compare the performance of LoRa with coherent and noncoherent receivers and we show that the coherent detection of LoRa is significantly more beneficial in interference scenarios than in the presence of only AWGN.
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