Patent ID: 8284711

Claim:
A method of transmitting via a radio comprising: obtaining data for transmission; converting the data into first packets having a destination network address; encoding the first packets in a first plurality of orthogonal frequency division multiplexed (OFDM) tones, wherein the tones of the first plurality of OFDM tones are limited in frequency to a human speech range from about 300 Hz to about 3,000 Hz; modulating a carrier frequency with the first encoded tones; transmitting, via a voice grade radio, the modulated carrier frequency as a first Radio Frequency (RF) signal; receiving, using the voice grade radio, a second plurality of OFDM tones limited in frequency to the human speech range, wherein the voice grade radio comprises a bandpass filter to exclude components of received signals with frequencies outside of the human speech range; decoding data encoded in the received second plurality of OFDM tones into second packets; determining a destination address of the decoded second packets; determining a next-hop node to which to forward the second packets; re-encoding the second packets into third packets; and retransmitting the third packets to the next-hop node using a third plurality of OFDM tones limited in frequency to the human speech range, wherein said retransmitting comprises: encoding the third packets in the third plurality of OFDM tones limited in frequency to the human speech range; modulating the carrier frequency with the third encoded tones; and transmitting the modulated carrier frequency as a second RF signal.