Method for providing packet framing in a communication system
AssigneeCypress Semiconductor Corporation
InventorDavid Wright
Life of this patent
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Abstract
An improved method of framing data packets in a direct sequence spread spectrum (DSSS) system that uses one pseudo-noise code (PN-Code) to frame the packet with a start-of-packet (SOP) and end-of-packet (EOP) indicator, and a different PN-Code to encode the data payload. Furthermore, the SOP is represented by the framing PN-Code, and the EOP is represented by the inverse of the framing PN-Code. This method creates a robust framing system that enables a DSSS system to operate with a low threshold of detection, thus maximizing transmission range even in noisy environments. Additionally, the PN-Code used for the SOP and EOP indicators can be used to indicate an acknowledgement response.
Claims20
A method of framing packets in a communications system comprising:
- encoding and transmitting a start-of-packet indicator, said start-of-packet indicator being encoded with a first pseudo-noise code (PN-code) word, wherein the start-of-packet indicator comprises two instances of the first PN-code word;
- and
- encoding and transmitting data, said data being encoded with a second PN-Code code word, wherein the communications system comprises a plurality of transmitters and each transmitter uses a different first PN-code word and the same second PN-code word.
A system for transmitting data over a communications channel comprising:
- a transmitter that transmits data packets over said communications channel by transmitting a start-of-packet indicator encoded with a first pseudo-noise code (PN-code) word, followed by data encoded with a second PN-code word, wherein the start-of-packet indicator comprises two instances of the first PN-code word;
- and
- a receiver that receives data packets from said communications channels and that decodes said start-of-packet indicator using said first PN-code word, and said data using said second PN-code word,
- wherein there is a plurality of transmitters and the first PN-code word is different for each transmitter and the second PN-code word is the same for all the transmitters.
A method of framing packets in a communications system comprising:
- encoding and transmitting a start-of-packet indicator, said start-of-packet indicator being encoded with a first pseudo-noise code (PN-code) word;
- and
- encoding and transmitting data, said data being encoded with a second PN-Code code word, wherein the communications system comprises a plurality of transmitters and each transmitter of the plurality of transmitters uses a different first PN-code word and the same second PN-code word.
A system for transmitting data over a communications channel comprising:
- a first transmitter of a plurality of transmitters that transmits data packets over said communications channel by transmitting a start-of-packet indicator encoded with a first pseudo-noise code (PN-code) word, followed by data encoded with a second PN-code word, wherein the second PN-code word is different for each transmitter of the plurality of transmitters and the first PN-code word is the same for all transmitters of the plurality of transmitters;
- and
- a receiver that receives data packets from said communications channels and that decodes said start-of-packet indicator using said first PN-code word, and said data using said second PN-code word.
Dependencies are inferred from the claim text.