초록 ▼

An adaptive data rate communications system makes a compound error communications channel, with random and non-random impulsive noise, appear to be a gaussian channel. The process uses a cascade of digital error control coding, spread spectrum modulation, pseudo random chip interleaving, and feedbac

An adaptive data rate communications system makes a compound error communications channel, with random and non-random impulsive noise, appear to be a gaussian channel. The process uses a cascade of digital error control coding, spread spectrum modulation, pseudo random chip interleaving, and feedback techniques. The communications process yields a dynamic chip to bit ratio for each frame. These communications process techniques along with the careful employment of the time/distance factors of distance between transmitter and receiver, chip transmission rate, nominal chip to bit ratio, and number of bits in the frame yield a high throughput efficiency.

대표청구항 ▼

A packet communications system comprising: first frame storage means for storing a plurality of bit frames of data, wherein each bit frame comprises a string of bits of a predetermined length; first pseudo-random number storage means for storing first pseudo-random number data therein, wherein said

A packet communications system comprising: first frame storage means for storing a plurality of bit frames of data, wherein each bit frame comprises a string of bits of a predetermined length; first pseudo-random number storage means for storing first pseudo-random number data therein, wherein said pseudo-random number data comprises a string of bits larger than said predetermined length; chip generator means for modulating a bit frame of data at a first input thereof by a chip generator bit frame of data located at a second input thereof in order to provide a modulated chip frame of data at an output thereof, wherein said bit frame of data, said chip generator bit frame of data, and said chip frame of data, each comprise a string of bits having said predetermined length; a communications channel having a data path therein and a feedback path therein; a data transmitter for transmitting data along said data path; a feedback receiver for receiving feedback signals from said feedback path; means for detecting a correct recognition acknowledgement signal received by said feedback receiver; odd transmission queue generation means for generating a plurality of odd modulated chip frames by supplying every odd numbered bit frame of data stored in succession within said first frame storage means to said first input of said chip generator means and supplying successive string of bits of said pseudo-random number data from said first pseudo-random number storage means to said second input of said chip generator means in order to generate a predetermined number of chip frames of data for each odd numbered bit frame of data until a last odd numbered frame of data is detected; even transmission queue generation means for generating a plurality of even modulated chip frames by supplying every even numbered bit frame of data stored in succession within said first frame storage means to said first input of said chip generator means and supplying successive bits of pseudo-random number data from said first pseudo-random number storage means to said second input of said chip generator means in order to generate said predetermined number of chip frames of data for each even numbered bit frame of data until a last even numbered bit frame of data is detected, wherein each even modulated chip frame is generated after an odd modulated chip frame is generated; odd transmission queue storage means for storing an odd modulated chip frame after it has been generated by said odd transmission queue generation means; even transmission queue storage means for storing an even modulated chip frame after it has been generated by said even transmission queue generation means; transmission means having a first transmitting function which, when activated, transmits each successive chip frame from said odd transmission queue storage means until a correct recognition acknowledgement signal is detected by said means for detecting and, in response thereto, activates a second transmitting function for transmits each successive chip frame from said even transmission queue storage means until a correct recognition acknowledgement signal is detected, in which case said first transmitting function is reactivated; and, means for activating said first transmitting function after a first odd modulated chip frame is stored in said odd transmission queue storage means.