Asymmetrical transport of data

Details Asymmetrical transport of data Asymmetrical transport of data

2006-02-21

2006-02-21

Patel, Ajit (Department: 2664)

Multiplex communications

Generalized orthogonal or special mathematical techniques

Plural diverse modulation techniques

C370S352000, C375S353000

Reexamination Certificate

active

07002898

ABSTRACT:
A system is described which provides bidirectional transport of data at different data rates for each direction over a shared medium. In one embodiment, the different data rates are accomplished using different modulation techniques. For example, in the downstream direction, quadrature amplitude modulation (QAM)64is used and in the upstream direction orthogonal frequency division multiplexing (OFDM) is used. The QAM64modulation provides for a higher number of bits per hertz in a transmission channel. By using QAM64modulation, down stream transmission rates on the order of 30 megabits per second (Mbps) in a 6 MHz channel can be achieved. A number of 6 MHz channels can be combined to provide for even higher data rates.

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