Rate adaptive data broadcast technique
OwnerNiket Patwardhaninventor
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Abstract
This invention describes a novel digital broadcast modulation scheme to provide wide area coverage at a high bit rate from a single transmitter. The scheme creates an additional dimension within which to create transmission channels besides those of time, code, direction and frequency. Advantages of scheme include lower power to deliver the same total bit rate to an area, wider coverage using the same power, and closer spacing of transmitters sharing the same frequencies. It is particularly well suited to supporting broadcast of data to a large population of users.
Claims9
1) A mechanism to simultaneously transmit multiple messages in a digital broadcast system, comprising;
- a multiplexor to combine one or more bits from multiple messages into a digital symbol, so each symbol has bits from multiple messages;
- a DA converter, which could be comprised of a separate DA converter and an RF modulator, that converts the digital symbol into an analog symbol;
- an AD converter, which could be comprised of a separate RF demodulator and AD converter, that converts the analog symbol back into a digital symbol;
- a demultiplexor that recreates each message from corresponding parts of multiple digital symbols.
Dependencies are inferred from the claim text.