Long-Range Voice and Data Transmission Using LoRa Modulation and Sensitivity-Enhancing Buffering Techniques

Abstract

Systems and methods are disclosed for extending the communication range of mobile communication devices. A long-range radio device is controlled by a control application on a host smartphone. The long-range radio device provides signal paths for two different radios, one employing a long-range (LoRa) modulation format, and another employing a high data-rate encoding such as FSK. The system provides graceful degradation in data rate as radio link distance increases and received signal strength decreases. In addition to switching between radios, variable compression and buffering are used to adapt usage to supportable data rates. Voice, other audio, video, text, binary, and other data formats are supported, as also a wide range of co-resident host apps. Unidirectional and bidirectional links can be used.

1 . A system comprising:
 a long-range radio device comprising:
 a first long-range radio modem; 
 a second high data-rate radio modem; 
 a first local interface; and 
 a controller; and 
   a control application executing on a host device having a second local interface;   wherein the long-range radio device and the control application are operable to communicate over a link connecting the first and second local interfaces;   wherein the control application is operable to control the long-range radio device; and   wherein the controller of the long-range radio device is operable to select the first radio modem responsive to a first command received from the control application, to select the second radio modem responsive to a second command received from the control application, and to communicate data between the first local interface and a selected one of the first and second radio modems.   
     
     
         2 . The system according to  claim 1 , wherein the first long-range radio modem conforms to a LoRa modulation format. 
     
     
         3 . The system according to  claim 1 , wherein the second high data-rate modem employs frequency shift keying. 
     
     
         4 . The system according to  claim 1 , wherein the link connecting the first and second local interfaces is a wireless link. 
     
     
         5 . The system according to  claim 4 , wherein the wireless link is a Bluetooth® link. 
     
     
         6 . The system according to  claim 1 , wherein the link connecting the first and second local interfaces is a wired link. 
     
     
         7 . The system according to  claim 1 , wherein the host device is a smartphone. 
     
     
         8 . The system according to  claim 1 , wherein the control application controls selection of the first or second radio modem at least partially based on a received signal strength indication. 
     
     
         9 . The system according to  claim 1 , wherein the control application controls selection of the first or second radio modem at least partially based on a location reported by a location finder. 
     
     
         10 . The system according to  claim 1 , wherein the control application controls at least one of:
 buffering,   compression parameters,   data rate, or   transmit power.   
     
     
         11 . A method for operating an extended range radio system having a long-range radio and a high data-rate radio for communicating with a remote station, comprising:
 monitoring a signal indicating a distance between the extended range radio system and the remote station;   in at least a first case responsive to the signal corresponding to a decrease of the distance, selecting the high-data rate radio and deselecting the long-range radio; and   in at least a second case responsive to the signal corresponding to an increase of the distance, selecting the long-range radio and deselecting the high-data rate radio.   
     
     
         12 . The method of  claim 11 , wherein the monitored signal is a received signal strength. 
     
     
         13 . The method of  claim 11 , wherein the monitored signal is a position determined by a location-finder. 
     
     
         14 . The method of  claim 11 , further comprising:
 subsequent to selecting the long-range radio, applying buffering to a communication.   
     
     
         15 . A method for operating a radio system, comprising:
 by a control application on a smartphone:
 receiving a source signal comprising voice or data; 
 causing the source signal to be compressed; 
 transmitting the compressed signal over a local link to a transceiver comprising first and second radios supporting different respective wireless standards; 
   at the transceiver:
 receiving the compressed signal over the local link; 
 forwarding the compressed signal to a selected one of the first or second radios; 
 encoding and transmitting the compressed signal according to the wireless standard of the selected radio. 
   
     
     
         16 . The method of  claim 15 , wherein the compression is performed according to parameters at least partly based on an allowable data rate of the radio system. 
     
     
         17 . The method of  claim 15 , wherein the source signal is a voice signal, and further comprising:
 by a vocoder on the smartphone:
 compressing the source signal. 
   
     
     
         18 . The method of  claim 15 , wherein the selected radio is a long-range radio, and further comprising:
 by the control application on the smartphone:
 reducing a bandwidth required for the transmitting by causing the compressed source signal to be buffered. 
   
     
     
         19 . The method of  claim 15 , wherein the first radio is a long-range radio, and, when the selected radio is the first radio, encoding comprises applying CSS modulation. 
     
     
         20 . The method of  claim 15 , further comprising:
 at the transceiver:
 receiving a second signal according to the wireless standard of the selected radio; 
 decoding the second signal; and 
 forwarding the decoded signal to the control application over the local link; and 
   by the control application on the smartphone:
 receiving the decoded signal over the local link; 
 causing the decoded signal to be decompressed; and 
 forwarding the decompressed decoded signal to a destination, 
 wherein the destination is at least one of:
 a storage module; 
 an interface of the smartphone; or 
 an app on the smartphone.