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RF96 Arkusz danych(PDF) 22 Page - HOPE Microelectronics CO., Ltd.

Numer części RF96
Szczegółowy opis  Low Power Long Range Transceiver
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Producent  HOPE [HOPE Microelectronics CO., Ltd.]
Strona internetowa  https://www.hoperf.com/
Logo HOPE - HOPE Microelectronics CO., Ltd.

RF96 Arkusz danych(HTML) 22 Page - HOPE Microelectronics CO., Ltd.

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Page 22
RF96/97/98
Tel: +86-755-82973805
Fax: +86-755-82973550
E-mail: sales@hoperf.com http://www.hoperf.com
WIRELESS & SENSING
PRELIMINARY
DATASHEET
4. RF96/97/98 Digital Electronics
4.1. The LoRa
TM Modem
The LoRaTM modem uses spread spectrum modulation and forward error correction techniques to increase the range and
robustness of radio communication links compared to traditional FSK or OOK based modulation. Examples of the
performance improvement possible, for several possible settings, are summarised in the table below. Here the spreading
factor and error correction rate are design variables that allow the designer to optimise the trade-off between occupied
bandwidth, data rate, link budget improvement and immunity to interference.
Table 58 Example LoRa
TM Modem Performances
Bandwidth
(kHz)
Spreading Factor
Coding rate
Nominal Rb
(bps)
Sensitivity
indication
(dBm)
Frequency
Reference
10.4
6
4/5
782
TBC
TCXO
12
4/5
24
TBC
20.8
6
4/5
1562
TBC
12
4/5
49
TBC
62.5
6
4/5
4688
-121
XTAL
12
4/5
146
-139
125
6
4/5
9380
-118
12
4/5
293
-136
For European operation the range of crystal tolerances acceptable for each sub-band (of the ERC 70-03) is given in the
specifications table. For US based operation a frequency hopping mode is available that automates both the LoRaTM spread
spectrum and frequency hopping spread spectrum processes.
Another important facet of the LoRaTM modem is its increased immunity to interference. The LoRaTM modem is capable of
co-channel GMSK rejection of up to 25 dB. This immunity to interference permits the simple coexistence of LoRaTM
modulated systems either in bands of heavy spectral usage or in hybrid communication networks that use LoRaTM to extend
range when legacy modulation schemes fail.


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