Patent ID: 8098764

Claim:
A variable data rate binary phase shift keying (BPSK) millimeter wave radio communications system comprising: A) a transmitter adapted to receive on-off keyed (OOK) data at a data rate and to transmit BPSK encoded data at a baud rate using a millimeter wave carrier at a millimeter wave frequency, said transmitter comprising: 1) a frequency stabilized millimeter wave source operating at said millimeter wave frequency; 2) an encoder having an output clocked at said baud rate and adapted to encode said data such that the output is equal to the Exclusive Or (XOR) of said OOK data and said output; and 3) a modulator adapted to apply the output of the encoder to the millimeter wave carrier as a BPSK signal; wherein said data rate is approximately equal to the baud rate divided by an integer n, where n=1, 2, 3 . . . and B) a receiver adapted to receive a millimeter wave signal transmitted from the transmitter comprising: 1) a millimeter wave amplifier adapted to amplify said received millimeter wave signal; 2) a splitter adapted to split said amplified signal; 3) a mixer defining two mixer inputs and a mixer output; and 4) a circuit defining two propagation paths from said splitter to each of said two mixer inputs with different path lengths defining a signal time delay; wherein said signal time delay is approximately equal to the reciprocal of said baud rate, and equal to a half integer multiple of the reciprocal of said millimeter wave frequency to within 25% of the reciprocal of said millimeter wave frequency; and wherein said output reproduces said OOK data provided to said transmitter.