초록 ▼

A method of communicating digital information as a stream of binary chip values impressed on a transmitted signal during a series of discrete transmitter chip intervals. During a preamble period, the transmitter provides a predetermined transmitter clock signal having a series of different values du

A method of communicating digital information as a stream of binary chip values impressed on a transmitted signal during a series of discrete transmitter chip intervals. During a preamble period, the transmitter provides a predetermined transmitter clock signal having a series of different values during a series of crumb intervals, each such crumb interval being a rational fraction of one transmitter chip interval. The receiver generates plural series of receiver chip intervals offset in time from one another. During the preamble period, the receiver subdivides each chip interval of each such series into receiver crumb intervals. The receiver selects one series of receiver chip intervals for which the values of the detected signal best match a template corresponding to the transmitter clock signal. This selected series of receiver chip intervals is the series best synchronized with the transmitter chip intervals. After the preamble period, the receiver recovers the binary chip values by assigning values to successive intervals in the selected series of receiver chip intervals according to the value of the detected signal for each interval in that selected series.

대표청구항 ▼

A spread spectrum method of communicating digital information comprising the steps of: (a) timing predetermined transmitter chip intervals; (b) during a preamble period, generating a preamble chip signal having either a first or second binary value during each of said transmitter chip intervals, gen

A spread spectrum method of communicating digital information comprising the steps of: (a) timing predetermined transmitter chip intervals; (b) during a preamble period, generating a preamble chip signal having either a first or second binary value during each of said transmitter chip intervals, generating a transmitter clock signal having a predetermined series of different values for different transmitter crumb intervals, each transmitter crumb interval being a rational fraction of one of said chip intervals, and impressing both said transmitter clock signal and said preamble signal on a predetermined parameter of a transmitted signal so that said predetermined parameter of said transmitted signal carries said preamble signal encoded with said transmitter clock signal; (c) after said preamble period, transmitting said information as a stream of binary chip values impressed upon said predetermined parameter of said transmitted signal; (d) detecting said transmitted signal at a receiver remote from said transmitter and producing a detector signal representative of the value of said predetermined parameter in said transmitted signal; (e) generating at said receiver plural separate sequences of chip intervals such that the duration of each said chip interval in each said sequence is equal to the duration of said transmitter chip intervals and so that said sequences of receiver chip intervals are offset in time from one another, and subdividing each chip interval in each of said separate sequences into receiver crumb intervals equal in duration to said transmitter crumb intervals; (f) determining whether each of said separate series of receiver chip intervals satisfies the condition that the values of said detector signal for the crumb intervals in each chip interval match a template corresponding to said predetermined series of values in said transmitter clock signal, and selecting as a decoding sequence one of said separate series of receiver chip intervals which best satisfies said condition; and (g) after said preamble period, assigning first or second binary values to said chip intervals in said decoding sequence within said receiver according to the value of said decoder signal during each said decoding chip interval, to thereby provide said decoding chip intervals with binary values corresponding to the binary values in said digital information.