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Datenblatt-Suchmaschine für elektronische Bauteile |
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Datenblatt-Suchmaschine für elektronische Bauteile |
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RF96 Datenblatt(PDF) 27 Page - HOPE Microelectronics CO., Ltd. |
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RF96 Datenblatt(HTML) 27 Page - HOPE Microelectronics CO., Ltd. |
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27 / 121 page  Page 27 RF96/97/98 Tel: +86-755-82973805 Fax: +86-755-82973550 E-mail: sales@hoperf.com http://www.hoperf.com pay l o a--d WIRELESS & SENSING PRELIMINARY DATASHEET The header is transmitted with maximum error correction code (4/8). It also has its own CRC to allow the receiver to discard invalid headers. Implicit Header Mode In certain scenarios, where the payload, coding rate and CRC presence are fixed or known in advance, it may be advantageous to reduce transmission time by invoking implicit header mode. In this mode the header is removed from the packet. In this case the payload length, error coding rate and presence of the payload CRC must be manually configured on both sides of the radio link. Note With SF = 6 selected, implicit header mode is the only mode of operation possible. Payload The packet payload is a variable-length field that contains the actual data coded at the error rate either as specified in the header in explicit mode or in the register settings in implicit mode. An optional CRC may be appended. For more information on the payload and how it is loaded from the data buffer FIFO please see Section 4.1.2.3. 4.1.1.7. Time on air For a given combination of spreading factor (SF), coding rate (CR) and signal bandwidth (BW) the total on-the-air transmission time of a LoRaTM packet can be calculated as follows. From the definition of the symbol rate it is convenient to define the symbol rate: Ts = -- 1 --- Rs The LoRa packet duration is the sum of the duration of the preamble and the transmitted packet. The preamble length is calculated as follows: T p r e a mble = (np r e a m b le + 4.25 )Ts y m where npreamble is the programmed preamble length, PreambleLength.The payload duration depends upon the header mode that is enabled. The following formulae give the payload duration in implicit (headerless) and explicit (with header) modes. 8lpayload – 4SF + 24 + ------------------------------------- (CR + 4) where: l pay l o a d > 0, implicit header T s ym 8 ceil ------------- 4SF T pay l oad = 8l – 4SF + 44 + ----------------------------- (CR + 4) where: l > 0, explicit header Tsym 8 ceil-------------------4SF Addition of these two durations gives the total packet on -air time. Tpacket = Tpreamble + Tpayload 4.1.1.8. Frequency Hopping with LoRa TM Frequency hopping spread spectrum (FHSS) is typically employed when the duration of a single packet could exceed regulatory requirements relating to the maximum permittable channel dwell time. This is most notably the case in US operation where the 902 to 928 MHz ISM band can be used ina frequency hopping mode. To ease implementation of FHSS systems the frequency hopping mode of the LoRaTM modem can be enabled (see FhssMode of register RegTxCfg1). |
Ähnliche Teilenummer - RF96 |
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Ähnliche Beschreibung - RF96 |
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