Patent ID: 8483649

Claim:
An energy efficient wireless device having a sleep mode and a wake-up mode, the device comprising: a first receiver portion having an operational amplifier feeding a Direct Sequence Spread Spectrum decoder and an identity decoder, wherein the first receiver portion is a one-bit modem; a second receiver portion having an analog to digital converter feeding a signal processor, wherein the second receiver portion consumes more power than the first receiver portion; a first clock for providing timing to the first receiver portion; and a second clock for providing timing to the second receiver portion, the second clock having a precision greater than the first clock; wherein the first receiver portion is configured to: receive an analog signal having a header and a payload; convert the header to a digital signal using the operational amplifier; decode the digital signal using the Direct Sequence Spread Spectrum decoder; and compare, using the identity decoder, an encoded string in the header with a set of known digital strings associated with available receivers to determine if the device is the intended receiver by: determining a Hamming distance defined between the encoded string and each of the plurality of known digital strings; selecting the known digital string having the shortest Hamming distance to the encoded string; identifying the receiver associated with the selected digital string as the intended receiver; and determining, using the first receiver portion, whether the device is the intended receiver; wherein the device is configured to be placed in a sleep mode if the device is not the intended receiver; and wherein the second receiver portion is configured to wake up and decode the payload if the device is the intended receiver.