Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
269 words
A maximum-likelihood diversity detection system for a digital signal propagated through a dispersive medium comprising: m(L 1) first means, each of said first means storing a different one of m(L 1) digital message sequences capable of being received from said medium, where m is an integer greater than one equal to the number of symbols transmitted and L is an integer greater than one equal to the number of bit intervals over which there will be significant receiver response due to a single transmitted one of said m symbols; n receivers for said digital signal, where n is an integer greater than one equal to the number of signal paths for said digital signal that has traveled through said dispersive medium; second means coupled to said n receivers to generate from said digital signal nmL noise residues; m(L 1) third means coupled to said second means, each of said third means detecting in a different one of m(L 1) groups of m noise residues that noise residue having a first minimum value; m(L 1) fourth means each coupled to a different one of said m(L 1) third means to store the associated one of said noise residue having said first minimum value; and fifth means coupled to said m(L 1) first means and said m(L 1) fourth means to detect from said stored noise residues that noise residue having a second minimum value and to provide one of said m(L 1) digital message sequences as an output digital message sequence for said detection system, said output message sequence being determined by said noise residue having said second minimum value.
Claim 2
Dependent Claim
269 words
A maximum-likelihood diversity detection system for a digital signal propagated through a dispersive medium comprising: m(L 1) first means, each of said first means storing a different one of m(L 1) digital message sequences capable of being received from said medium, where m is an integer greater than one equal to the number of symbols transmitted and L is an integer greater than one equal to the number of bit intervals over which there will be significant receiver response due to a single transmitted one of said m symbols; n receivers for said digital signal, where n is an integer greater than one equal to the number of signal paths for said digital signal that has traveled through said dispersive medium; second means coupled to said n receivers to generate from said digital signal nmL noise residues; m(L 1) third means coupled to said second means, each of said third means detecting in a different one of m(L 1) groups of m noise residues that noise residue having a first minimum value; m(L 1) fourth means each coupled to a different one of said m(L 1) third means to store the associated one of said noise residue having said first minimum value; and fifth means coupled to said m(L 1) first means and said m(L 1) fourth means to detect from said stored noise residues that noise residue having a second minimum value and to provide one of said m(L 1) digital message sequences as an output digital message sequence for said detection system, said output message sequence being determined by said noise residue having said second minimum value.
Claim 3
Dependent Claim
45 words
A detection system according to claim 1, wherein m is equal to four as provided by a quaternary phase shift keyed modulation system; n is equal to 2; L is equal to 3; m(L 1) is equal to 16; and nmL is equal to 128.
Claim 4
Dependent Claim
69 words
A detection system according to claim 1, wherein said fifth means includes a minimum value selector coupled to all of said m(L 1) fourth means to detect said noise residue having said second minimum value, and a switching arrangement coupled to all of said m(L 1) first means and said minimum value selector controlled by said noise residue having said second minimum value to provide said output message sequence.
Claim 5
Dependent Claim
103 words
A detection system according to claim 1, further including m(L 1) sixth means each coupled to a different one of said m(L 1) first means, m predetermined ones of said first means and a different one one of said m(L 1) third means to update said message sequence stored in the associated one of said m(L 1) first means by a predetermined number of bits of said message sequence in that one of said m predetermined ones of said means corresponding to said noise residue having said first minimum value in the associated one of said m(L 1) groups of m noise residues.
Claim 6
Dependent Claim
66 words
A detection system according to claim 4, wherein each of said sixth means includes a first switching arrangement for each of said predetermined number of bits, each of said switching arrangements being coupled to each of said m predetermined ones of said first means and controlled by said noise residue having said first minimum value detected by the associated one of said m(L 1) third means.
Claim 7
Dependent Claim
70 words
A detection syStem according to claim 5, wherein said fifth means includes a minimum value selector coupled to all of said m(L 1) fourth means to detect said noise residue having said second minimum value, and a second switching arrangement coupled to all of said m(L 1) first means and said minimum value selector controlled by said noise residue having said second minimum value to provide said output message sequence.
Claim 8
Dependent Claim
45 words
A detection system according to claim 6, wherein m is equal to four as provided by a quaternary phase shift keyed modulation system; n is equal to 2; L is equal to 3; m(L 1) is equal to 16; and nmL is equal to 128.
Claim 9
Dependent Claim
69 words
A detection system according to claim 4, wherein said fifth means includes a minimum value selector coupled to all of said m(L 1) fourth means to detect said noise residue having said second minimum value, and a switching arrangement coupled to all of said m(L 1) first means and said minimum value selector controlled by said noise residue having said second minimum value to provide said output message sequence.