Adaptive data rate packet communication system

• US 5,657,342 A
• Filed: 05/12/1994
• Issued: 08/12/1997
• Est. Priority Date: 10/23/1992
• Status: Expired due to Fees

• Current Assignee: David Olmstead
• Original Assignee: David Olmstead
• Inventors: Olmstead, David
• Primary Examiner(s): Chin, Wellington
• Assistant Examiner(s): Corrielus, Jean B.
• Application Number:
  US08/242,008
• Time in Patent Office: 1,188 Days
• Field of Search: 375/200, 375/205, 375/206, 375/204, 375/201, 370/18
• US Class Current: 375/130
• CPC Class Codes: H04B 1/707 using direct sequence modulation
• CPC Class Codes: H04J 13/00 Code division multiplex systems for frequency hopping H04B1/713
• CPC Class Codes: H04J 3/0602 Systems characterised by the synchronising information used
• CPC Class Codes: H04L 1/0071 Use of interleaving interleaving per se H03M13/27
• CPC Class Codes: H04L 1/1628 List acknowledgements, i.e. the acknowledgement message consisting of a list of identifiers, e.g. of sequence numbers H04L1/1614 takes precedence
• CPC Class Codes: H04L 1/1845 Combining techniques, e.g. code combining

Abstract

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.

Claims

1. A method of rearranging chips of a spread spectrum modulated bit frame for the transmission of chip frames, including the step of retrieving multiple groups of chips from the spread spectrum modulated bit frame to form chip frames, each chip frame containing at least one chip from each bit of the spread spectrum modulated bit frame, each chip frame representing a fraction of information from each bit of the bit frame which was spread spectrum modulated, each chip frame thereof representing a fractional part of information contained within the bit frame.

2. A method of rearranging the chips of a spread spectrum modulated bit frame for the transmission of chip frames as claimed in claim 1, further comprising the step of establishing a random order for each chip location within each successive chip frame so as to provide an improved performance against impulsive noise that appeared in synchronization with the transmission of chips.