M-ary orthogonal coded communications method and system

A method of encoding a signal using M-ary orthogonal keying, comprising:

• receiving a stream of data bits;
• breaking B data bits off of the stream of data bits to form a B-bit sequence;
• choosing a code that corresponds the B-bit sequence from among K unique codes;
• multiplying the chosen code by a pseudo-random sequence to-form a scrambled code;
• transmitting the scrambled code,
• wherein the K unique codes each correspond to one possible combination of the B data bits,
• wherein B is an integer greater than 1, and K is an integer greater than 3, and
• wherein the K code words are all either mutually orthogonal, or nearly orthogonal using a random correlation threshold.

A method of decoding a signal using M-ary orthogonal keying, comprising:

• receiving a code;
• correlating the received code with K possible codes to generate first through Kth correlation values, the K possible codes each representing one of a plurality of possible B-bit sequences;
• determining a received B-bit sequence by comparing the first through Kth correlation values;
• and
• outputting the received B-bit sequence,
• wherein B is an integer greater than 1 and K is an integer greater than 3, and
• wherein the K code words are all either mutually orthogonal, or nearly orthogonal using a random correlation threshold.

A method of decoding a signal using M-ary orthogonal keying, comprising:

• receiving a scrambled code;
• multiplying the scrambled code by a pseudo-random sequence to generate a descrambled code, the descrambled code being one of a plurality of K possible codes that each represent one of a plurality of possible B-bit sequences;
• correlating the descrambled code with the K possible codes to generate first through Kth correlation values;
• determining a received B-bit sequence by comparing the first through Kth correlation values;
• and
• outputting the received B-bit sequence,
• wherein B is an integer greater than 1 and K is an integer greater than 3, and
• wherein the K code words are all either mutually orthogonal, or nearly orthogonal using a random correlation threshold.

A method of decoding a signal using M-ary orthogonal keying, comprising:

• receiving a code;
• correlating the received code with K possible code words to generate first through Kth correlation values;
• determining a received B-bit sequence by comparing the first through Kth correlation values;
• and
• outputting the received B-bit sequence,
• wherein the K possible code words and inverses of the K possible code words each represent one of a plurality of possible B-bit sequences;
• wherein B is an integer greater than 1 and K is an integer greater than 1, and
• wherein the K code words are all either mutually orthogonal, or nearly orthogonal using a random correlation threshold.

A method of decoding a signal using M-ary orthogonal keying, comprising:

• receiving a scrambled code;
• multiplying the scrambled code by a pseudo-random sequence to generate a descrambled code, the descrambled code being one of a plurality of K possible code words or inverses of the K possible code words;
• correlating the descrambled code with the K possible code words to generate first through Kth correlation values;
• determining a received B-bit sequence by comparing the first through Kth correlation values;
• and
• outputting the received B-bit sequence,
• wherein the K possible code words and the K possible inverse code words each represent one of a plurality of possible B-bit sequences;
• wherein B is an integer greater than 1 and K is an integer greater than 1, and
• wherein the K code words are all either mutually orthogonal, or nearly orthogonal using a random correlation threshold.