Digital communication system having improved color code capability
First Claim
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1. A digital time division multiple access communication system comprising:
- a time slot comprising four quadrature amplitude modulation sub-channels of pre-selected time duration, each sub-channel time-divided into a plurality of symbol positions;
a plurality of sync symbols in respective sync symbol positions of each sub-channel;
a plurality of pilot symbols in respective pilot symbol positions of each sub-channel with the pilot symbols in one sub-channel timewise staggered with respect to the pilot symbols in an adjacent sub-channel;
a plurality of data symbols in data symbol positions of each sub-channel, located between said pilot symbols in said sub-channel; and
a color code defining values of said sync symbols, comprising a color code value mapped to said sync symbols.
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Abstract
A time division multiple access communication system is provided having multiple sub-channels according to known quadrature amplitude modulation techniques. Each sub-channel has a pre-determined time duration and is divided by a pre-determined number of symbol position time divisions. The symbol positions carry sync, pilot and data symbols. Color code information is incorporated into the sync and pilot symbols. The QAM constellation value of the sync symbol is mapped to a color code value. In addition, the sync symbol carries a color code extension which enlarges the color code space.
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Citations
20 Claims
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1. A digital time division multiple access communication system comprising:
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a time slot comprising four quadrature amplitude modulation sub-channels of pre-selected time duration, each sub-channel time-divided into a plurality of symbol positions;
a plurality of sync symbols in respective sync symbol positions of each sub-channel;
a plurality of pilot symbols in respective pilot symbol positions of each sub-channel with the pilot symbols in one sub-channel timewise staggered with respect to the pilot symbols in an adjacent sub-channel;
a plurality of data symbols in data symbol positions of each sub-channel, located between said pilot symbols in said sub-channel; and
a color code defining values of said sync symbols, comprising a color code value mapped to said sync symbols. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A digital time division multiple access communication system comprising:
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a time slot comprising four quadrature amplitude modulation sub-channels of pre-selected time duration, each sub-channel time-divided into a plurality of symbol positions;
a plurality of sync symbols in respective symbol positions of each sub-channel;
a plurality of pilot symbols in symbol positions of each sub-channel with the pilot symbols in one sub-channel timewise staggered with respect to the pilot symbols in an adjacent sub-channel;
a plurality of data symbols in symbol positions of each sub-channel, located between said pilot symbols in said sub-channel; and
a color code defining values of said sync symbols, comprising a color code value mapped to said sync symbols with an additional color code extension parameter combined with the color code value. - View Dependent Claims (15, 16, 17, 18)
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19. A digital time division multiple access communication system comprising:
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a time slot comprising four quadrature amplitude modulation sub-channels of pre-selected time duration, each sub-channel time-divided into a plurality of symbol positions;
a plurality of sync symbols in respective sync symbol positions of each sub-channel;
a plurality of pilot symbols in respective pilot symbol positions of each sub-channel with the pilot symbols in one sub-channel timewise staggered with respect to the pilot symbols in an adjacent sub-channel;
a plurality of data symbols in data symbol positions of each sub-channel, located between said pilot symbols in said sub-channel; and
a color code defining values of said pilot symbols, comprising a color code value mapped to said pilot symbols. - View Dependent Claims (20)
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Specification