Method of generating and receiving packets in low energy critical infrastructure monitoring system
First Claim
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1. A method of modulation, the method comprising:
- mapping each bit of a bit string to at least four symbols;
allocating a modulation frequency to each of the symbols;
allocating a position to be transmitted in a duration of each of the symbols; and
modulating each of the symbols based on the modulation frequency and the position,wherein the allocating comprises dividing the duration of the symbol into a plurality of positions and selecting a position at which the allocated modulation frequency is to be transmitted and a position at which the allocated modulation frequency is not to be transmitted.
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Abstract
A method of generating a packet for low energy critical infrastructure monitoring (LECIM) wireless communication is provided. The method includes steps of generating a first bit string by multiplexing a physical layer header (PHR) bit and a physical layer service data unit (PSDU) bit; convolution encoding the first bit string; interleaving the convolution-encoded first bit string; generating a second bit string by multiplexing the interleaved first bit string with a synchronization header (SHR) bit; and modulating the second bit string with a frequency shift keying (FSK) method and a position-based FSK method.
63 Citations
20 Claims
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1. A method of modulation, the method comprising:
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mapping each bit of a bit string to at least four symbols; allocating a modulation frequency to each of the symbols; allocating a position to be transmitted in a duration of each of the symbols; and modulating each of the symbols based on the modulation frequency and the position, wherein the allocating comprises dividing the duration of the symbol into a plurality of positions and selecting a position at which the allocated modulation frequency is to be transmitted and a position at which the allocated modulation frequency is not to be transmitted. - View Dependent Claims (2, 3)
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4. A method of generating a packet, the method comprising:
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generating a first bit string by multiplexing a physical layer header (PHR) bit and a physical layer service data unit (PSDU) bit with synchronization header (SHR) bits; and modulating the first bit string with at least one of a frequency shift keying (FSK) method and a method in which position information is reflected to the FSK method, wherein each of symbols in the first bit string is modulated based on modulation frequency and position that are allocated to the each of the symbols, wherein, when the position is allocated to the each of the symbols, the duration of the symbol is divided into a plurality of positions, and a position at which the allocated modulation frequency is to be transmitted and a position at which the allocated modulation frequency is not to be transmitted are selected. - View Dependent Claims (5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A method of receiving a packet in a receiver, the method comprising:
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demodulating a packet that is received from an antenna with at least one of a frequency shift keying (FSK) method and a method in which position information is reflected to the FSK method; de-interleaving the demodulated packet; decoding the de-interleaved packet; and demultiplexing the decoded packet to a physical layer header (PHR) bit and a physical layer service data unit (PSDU) bit, wherein each of symbols in the received packet is modulated based on modulation frequency and position that are allocated to the each of the symbols, wherein, when the position is allocated to the each of the symbols, the duration of the symbol is divided into a plurality of positions, and a position at which the allocated modulation frequency is to be transmitted and a position at which the allocated modulation frequency is not to be transmitted are selected. - View Dependent Claims (20)
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Specification