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US 2003/0147471 A1Published application
Cross correlated trellis coded quatrature modulation transmitter and system
OwnerMarvin K. Simon, Tsun-Yee Yaninventors
Life of this patent
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Abstract
System of modulating information onto an arbitrary waveshape. The system trellis codes the modulation.
Claims29
A method of a coding a signal, comprising:
- mapping multiple possible combinations of waveforms to full symbols of bits from both in phase (I) and quadrature (Q) channels, said mapping being such that mapping output is time synchronous over multiple symbols, and has a normalized envelope over all symbols;
- and
- applying input signals from both I and Q channels to said mapping to form a coded waveform representing said signals.
A method, comprising:
- forming full symbol mappings between in phase (I) and quadrature (Q) bitstreams;
- producing an output coded waveform representative of the in phase and quadrature bitstreams;
- delaying one of said bitstreams by half a symbol so that both I and Q parts of the bitstreams are simultaneously available;
- and
- using both said I and Q parts to obtain one of said mappings.
2 more elements
A method, comprising:
- obtaining a data stream of bits;
- separating said stream into in phase and quadrature sequences;
- delaying one of said sequences to form time synchronous I and Q sequences;
- and
- coding a full symbol of the I and Q sequences into coded waveforms indicative thereof.
2 more elements
A coding system, comprising:
- a serial to parallel converter, receiving a plurality of bits at an input thereof, and providing said bits to both an in phase and a quadrature channel;
- using both of said in phase and quadrature channels to code said bits as a waveform, by cross correlating and mapping said signals to a specified waveform based on a waveform table which maps between full symbols and coded outputs of said in phase and quadrature channels;
- delaying one of said in phase and quadrature channels relative to the other to ensure time synchronicity;
- and
- transmitting the waveforms to represent said plurality of bits.
2 more elements
A method, comprising:
- forming a table which correlates between full symbol encoder outputs and specified outputs of a specified coding system using symbol by symbol mappings;
- and
- using input data sequences to form outputs in the specified coding system.
Dependencies are inferred from the claim text.