271 research outputs found
Regard institutionnel sur la transposition didactique du Théorème de Lagrange en mathématique et en économie
A Maximum-Likelihood-based Multi-User LoRa Receiver Implemented in GNU Radio
LoRa is a popular low-power wide-area network (LPWAN) technology that uses
spread-spectrum to achieve long-range connectivity and resilience to noise and
interference. For energy efficiency reasons, LoRa adopts a pure ALOHA access
scheme, which leads to reduced network throughput due to packet collisions at
the gateways. To alleviate this issue, in this paper we analyze and implement a
LoRa receiver that is able to decode LoRa packets from two interfering users.
Our main contribution is a two-user detector derived in a maximum-likelihood
fashion using a detailed interference model. As the complexity of the
maximum-likelihood sequence estimation is prohibitive, a complexity-reduction
technique is introduced to enable a practical implementation of the proposed
two-user detector. This detector has been implemented along with an
interference-robust synchronization algorithm on the GNU Radio
Software-Defined-Radio (SDR) platform. The SDR implementation shows the
effectiveness of the proposed method and also allows its experimental
evaluation. Measurements indicate that our detector inherently leverages the
time offset between the two colliding users to separate and demodulate their
contributions.Comment: 2020 Asilomar Conference on Signals, Systems, and Computers, Pacific
Grove, CA, US
ΠΠ°Π½Π΄Π΅ΠΌΠΈΡ COVID-19 - ΡΡΠ΅Π·Π²ΡΡΠ°ΠΉΠ½Π°Ρ ΡΠΈΡΡΠ°ΡΠΈΡ Π² ΡΡΠ΅ΡΠ΅ Π·Π΄ΡΠ°Π²ΠΎΠΎΡ ΡΠ°Π½Π΅Π½ΠΈΡ
Π ΡΡΠ°ΡΡΠ΅ ΠΏΡΠ΅Π΄ΡΡΠ°Π²Π»Π΅Π½Π° ΠΈΠ½ΡΠΎΡΠΌΠ°ΡΠΈΡ ΠΎ Π²ΠΎΠ·Π½ΠΈΠΊΠ½ΠΎΠ²Π΅Π½ΠΈΠΈ ΠΏΠ°Π½Π΄Π΅ΠΌΠΈΠΈ ΠΊΠΎΡΠΎΠ½Π°Π²ΠΈΡΡΡΠ°, ΡΡΡΠΎΠ΅Π½ΠΈΠΈ ΠΊΠΎΡΠΎΠ½Π°Π²ΠΈΡΡΡΠ°, ΡΠΏΠΎΡΠΎΠ±Π°Ρ
Π·Π°ΡΠ°ΠΆΠ΅Π½ΠΈΡ. ΠΠΏΠΈΡΠ°Π½Ρ ΠΌΠ΅ΡΡ ΠΏΡΠΎΡΠΈΠ»Π°ΠΊΡΠΈΠΊΠΈ, ΠΏΡΠΈΠ²Π΅Π΄Π΅Π½Ρ Π΄Π°Π½Π½ΡΠ΅ ΠΎ ΡΠ°Π·ΡΠ°Π±ΠΎΡΠ°Π½Π½ΡΡ
Π²Π°ΠΊΡΠΈΠ½Π°Ρ
ΠΏΡΠΎΡΠΈΠ² ΠΊΠΎΡΠΎΠ½Π°Π²ΠΈΡΡΡΠ°.The article provides information about the occurrence of the coronavirus pandemic, the structure of the coronavirus, and methods of infection. Prevention measures are described, and data on developed coronavirus vaccines are provided
Protein intake in infancy and carotid intima media thickness at 5 years - a secondary analysis from a randomized trial
- β¦