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RF96 Arkusz danych(PDF) 22 Page - HOPE Microelectronics CO., Ltd. |
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RF96 Arkusz danych(HTML) 22 Page - HOPE Microelectronics CO., Ltd. |
22 / 121 page 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. |
Podobny numer części - RF96 |
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Podobny opis - RF96 |
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