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RFM95 Scheda tecnica(PDF) 25 Page - HOPE Microelectronics CO., Ltd. |
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RFM95 Scheda tecnica(HTML) 25 Page - HOPE Microelectronics CO., Ltd. |
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25 / 121 page  Page 25 RFM95/96/97/98(W) Tel: + 86-755-82973805 Fax: + 86-755-82973550 E-mail: sales@hoperf.com http:/ / www.hoperf.com WIRELESS & SENSING PRELIMINARY DATASHEET Forward error correction is particularly efficient in improving the reliability of the link in the presence of interference. So that the coding rate (and so robustness to interference) can be changed in response to channel conditions - the coding rate can optionally be included in the packet header for use by the receiver. Please consult Section 4.1.1.6 for more information on the LoRaTM packet and header. 4.1.1.4. Signal Bandwidth An increase in signal bandwidth permits the use of a higher effective data rate, thus reducing transmission time at the expense of reduced sensitivity improvement. There are of course regulatory constraints in most countries on the permissible occupied bandwidth. Contrary to the FSK modem which is described in terms of the single sideband bandwidth, the LoRaTM modem bandwidth refers to the double sideband bandwidth (or total channel bandwidth). The range of bandwidths relevant to most regulatory situations is given in the LoRaTM modem specifications table (see Section 2.4.5). Bandwidth (kHz) Spreading Factor Coding rate Nominal Rb (bps) 7.8 12 4/5 18 10.4 12 4/5 24 15.6 12 4/5 37 20.8 12 4/5 49 31.2 12 4/5 73 41.7 12 4/5 98 62.5 12 4/5 146 125 12 4/5 293 250 12 4/5 586 500 12 4/5 1172 Note In the lower band (169 MHz), the 250 kHz and 500 kHz bandwidths are not supported. 4.1.1.5. LoRa TM Transmission Parameter Relationship With a knowledge of the key parameters that can be controlled by the user we define the LoRaTM symbol rate as: Rs = ----- W --- 2SF where BW is the programmed bandwidth and SF is the spreading factor. The transmitted signal is a constant envelope signal. Equivalently, one chip is sent per second per Hz of bandwidth. |
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