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In some examples, a binary bit stream of input bits is encoded into a three-amplitude bipolar symbol stream of symbols, the encoding using a coding rule that specifies setting a value of a respective symbol of the symbol stream based on a respective input bit of the binary bit stream and a prior inp

In some examples, a binary bit stream of input bits is encoded into a three-amplitude bipolar symbol stream of symbols, the encoding using a coding rule that specifies setting a value of a respective symbol of the symbol stream based on a respective input bit of the binary bit stream and a prior input bit of the binary bit stream that is prior to the respective input bit, the coding rule further specifying that adjacent non-zero pulses keep the same polarity. A radio frequency (RF) carrier signal is modulated using the symbol stream to produce a modulated RF signal.

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1. A method of a device comprising a processor, comprising: encoding a binary bit stream of input bits into a three-amplitude bipolar symbol stream of symbols, the encoding using a coding rule that specifies setting a value of a respective symbol of the symbol stream based on a respective input bit

1. A method of a device comprising a processor, comprising: encoding a binary bit stream of input bits into a three-amplitude bipolar symbol stream of symbols, the encoding using a coding rule that specifies setting a value of a respective symbol of the symbol stream based on a respective input bit of the binary bit stream and a prior input bit of the binary bit stream that is prior to the respective input bit, the coding rule further specifying that adjacent non-zero pulses keep the same polarity, wherein a signal of each symbol of the three-amplitude bipolar symbol stream selectively has a value of −1, 0, or +1, wherein each symbol of the three-amplitude bipolar symbol stream has a specified time duration, and the specified time duration of each symbol is split into two subintervals, wherein a pulse is transmitted in one of the two subintervals of each symbol depending on a value of the respective input bit of the binary bit stream and a value of the prior input bit of the binary bit stream, and wherein the pulse transmitted in one of the two subintervals is selectively set to −1 or +1, andmodulating a radio frequency (RF) carrier signal using the symbol stream to produce a modulated RF carrier signal. 2. The method of claim 1, wherein the coding rule further specifies that non-adjacent non-zero pulses of the symbol stream toggle their polarity alternately. 3. The method of claim 1, wherein the coding rule further specifies that if the respective input bit and the prior input bit are each equal to a first element of a binary set, then a pulse polarity in a first subinterval of a current symbol is toggled from a pulse polarity of a previous symbol. 4. The method of claim 3, wherein the coding rule further specifies that if the respective input bit and the prior input bit are each equal to a second element of the binary set, then a pulse polarity in a second subinterval of the current symbol is toggled from the pulse polarity of the previous symbol. 5. The method of claim 4, wherein the coding rule further specifies that if the respective input bit is equal the second element of the binary set and the prior input bit is equal the first element of the binary set, then the pulse polarity in the second subinterval of the current symbol is toggled from the pulse polarity of the previous symbol. 6. The method of claim 5, wherein the coding rule further specifies that if the respective input bit is equal to the first element of the binary set and the prior input bit is equal to the second element of the binary set, then the pulse polarity in the first subinterval of the current symbol is maintained the same as the pulse polarity of the previous symbol. 7. The method of claim 1, wherein the coding rule further specifies that: if a pulse representing the respective input bit is transmitted in a first subinterval and the pulse representing the prior input bit is transmitted in a second subinterval, the pulse transmitted in the first subinterval for the respective input bit keeps the same polarity as the pulse transmitted in the second subinterval for the prior input bit,otherwise, the polarity of the pulse representing the respective input bit is toggled from the polarity of the pulse representing the prior input bit. 8. The method of claim 1, further comprising transmitting, by the device, the modulated RF signal to a receiver to awaken the receiver. 9. A transmitter comprising: a modulator to: encode a data bit stream of input bits into a three-amplitude bipolar symbol stream of symbols, the encoding using a coding rule that specifies setting a value of a respective symbol of the symbol stream based on a respective input bit of the data bit stream and a prior input bit of the data bit stream that is immediately prior to the respective input bit, the coding rule further specifying that adjacent non-zero pulses keep the same polarity, wherein each symbol of the three-amplitude bipolar symbol stream has a specified time duration, and the specified time duration of each symbol is split into two subintervals, and wherein a pulse is transmitted in one of the two subintervals of each symbol depending on a value of the respective input bit of the data bit stream and a value of the prior input bit of the data bit stream, wherein the pulse transmitted in one of the two subintervals is selectively set to −1 or +1; andmodulate a radio frequency (RF) carrier signal using the symbol stream to produce a modulated RF carrier signal. 10. The transmitter of claim 9, wherein the coding rule further specifies that non-adjacent non-zero pulses of the symbol stream toggle their polarities alternately. 11. The transmitter of claim 9, wherein the modulator comprises: a multiplier with a multiplier factor of −1, the multiplier to generate an inversed carrier signal that is the same as a carrier signal but with opposite polarity; anda switch having first, second, and third inputs, a control input, and an output to provide a modulated signal, wherein the first input receives the carrier signal, the second input is connected to ground, the third input receives the inversed carrier signal, and the control input receives a control signal based on the data bit stream. 12. The transmitter of claim 11, wherein the switch is to connect the output to the second input in response to a bit of the control signal set to a first element of a binary set, and the output is to remain connected to the second input until a bit of the control signal set to a second element of the binary set different from the first element of the binary set is received by the control input of the switch. 13. The transmitter of claim 12, wherein the output of the switch is connected to one of the first input and the third input in response to a bit of the control signal set to the second element of the binary set, and the output is to remain connected to the first or third input until a bit of the control signal set to the first element of the binary set is received by the control input of the switch. 14. The transmitter of claim 13, wherein the output of the switch is connected to the first input in response to a bit of the control signal set to the second element of the binary set if a prior change of the output of the switch is a change in connection of the output from the third input to the second input, and wherein the output of the switch is connected to the third input in response to a bit of the control signal set to the second element of the binary set if a prior change of the output of the switch is a change in connection of the output from the first input to the second input. 15. The transmitter of claim 11, wherein the control signal is the data bit stream. 16. The transmitter of claim 11, further comprising: an encoder to encode the data bit stream to produce the control signal, wherein the encoder encodes each respective input bit of the data bit stream into a respective pair of bits that form part of the control signal. 17. The transmitter of claim 16, wherein if the respective input bit is set to a first element of a binary set, then the respective pair of bits includes a first bit set to 0 and a second bit set to 1, and if the respective input bit is set to a second element of the binary set different from the first element of the binary set, then the respective pair of bits includes the first bit set to 1 and the second bit set to 0. 18. The transmitter of claim 12, wherein a signal of each symbol of the three-amplitude bipolar symbol stream selectively has a value of −1, 0, or +1. 19. The transmitter of claim 12, further comprising an antenna to transmit the modulated RF carrier signal. 20. A receiver comprising: an envelope detector to detect an envelope of a modulated radio frequency (RF) signal modulated using a modulation scheme that encodes a data bit stream of input bits into a three-amplitude bipolar symbol stream of symbols using a coding rule that specifies setting a value of a respective symbol of the symbol stream based on a respective input bit of the binary bit stream and a prior input bit of the binary bit stream that is prior to the respective input bit, the coding rule further specifying that adjacent non-zero pulses keep the same polarity, wherein the modulation scheme further splits each symbol of the symbol stream into two subintervals; anda comparator to compare an output of the envelope detector to a specified input to produce data bits corresponding to the input bits, the comparator to compare a value in a first subinterval of the two subintervals to a value in a second subinterval of the two subintervals. 21. The receiver of claim 20, wherein the specified input comprises a threshold, and the comparator compares the output of the envelope detector to the threshold.