Long Range Wireless Network Communication Capability

"We propose the Flexceiver, an ultra-wideband, spread spectrum modem for long range wireless networks. The basic concept of the Flexceiver is to sweep the carrier frequency of a modulated signal very rapidly across a wide bandwidth. The Flexceiver avoidsinterfering with other RF systems operating in dedicated bands by dynamically constructing frequency profiles that hop over the frequencies occupied by those systems. RF interference from other systems is avoided in the same manner. All-weathercapability is enabled by operating below the 4 GHz band where attenuation due to weather is insignificant. Low latency is afforded by the FPGA based implementation. By eliminating from the link budget a fading allowance, high data rate and range performance are facilitated by multipath tolerance of the system. While the total occupied bandwidth is wide, the instantaneous bandwidth of the waveform is narrow,consistent with that of the rate and type of modulation. The channel fades that occur at specific frequencies can be very deep, but are narrow and low duty cycle compared to the total occupied bandwidth. By sweeping rapidly, individual fades can belimited to single bit duration or less. Forward error correction is employed to recover faded bits. The anticipated benefit of developing a Flexceiver, a flexible Software Defined Radio (SDR) transceiver, targeted for long range wireless networks include: all-weather capability, ElectroMag