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RF96 Arkusz danych(PDF) 23 Page - HOPE Microelectronics CO., Ltd. |
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RF96 Arkusz danych(HTML) 23 Page - HOPE Microelectronics CO., Ltd. |
23 / 121 page Page 23 RF96/97/98 Tel: +86-755-82973805 Fax: +86-755-82973550 E-mail: sales@hoperf.com http://www.hoperf.com WIRELESS & SENSING PRELIMINARY DATASHEET 4.1.1. Link Design Using the LoRa TM Modem 4.1.1.1. Overview The LoRaTM modem is setup as shown in the following figure. This configuration permits the simple replacement of the FSK modem with the LoRaTM modem via the configuration register setting RegOpMode. This change can be performed on the fly (in Sleep operating mode) thus permitting the use of both standard FSK or OOK in conjunction with the long range capability. The LoRaTM modulation and demodulation process is proprietary, it uses a form of spread spectrum modulation combined with cyclic error correction coding. The combined influence of these two factors is an increase in link budget and enhanced immunity to interference. Figure 4. LoRa TM Modem Connectivity A simplified outline of the transmit and receive processes is also shown above. Here we see that the LoRaTM modem has an independent dual port data buffer FIFO that is accessed through an SPI interface common to all modes. Upon selection of LoRaTM mode, the configuration register mapping of the RF96/97/98 changes. For full details of this change please consult the register description of Section 6. So that it is possible to optimise the LoRaTM modulation for a given application, access is given to the designer to three critical design parameters. Each one permitting a trade off between link budget, immunity to interference, spectral occupancy and nominal data rate. These parameters are spreading factor, modulation bandwidth and error coding rate. |
Podobny numer części - RF96 |
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Podobny opis - RF96 |
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