Efficient low-power mode for multicarrier communications

Details Efficient low-power mode for multicarrier communications Efficient low-power mode for multicarrier communications

2008-07-22

2008-07-22

Bayard, Emmanuel (Department: 2611)

Pulse or digital communications

Systems using alternating or pulsating current

Plural channels for transmission of a single pulse train

C375S260000, C375S295000

Reexamination Certificate

active

07403569

ABSTRACT:
Multicarrier modulated communications, involving a transmitting modem (30; 30′) and a receiving modem (40; 40′) that operate according to normal operating mode and a low-power, quiescent, mode, are disclosed. In the quiescent mode, transmitter power is saved by scaling down the amplitude of the transmitted symbols in each frame by a scaling factor (A), and transmitting multiple instances of the frames in sequence. On receipt, the repeated frames are summed, and the summed amplitudes scaled to account for the repetition factor (M) and the scaling factor (A), to recover the transmitted information. If the repetition factor (M) is greater than or equal to the square of the scaling factor (A), the signal-to-noise ratio in quiescent mode is at least as high as that in normal operation. The repeating, scaling, and summing may all be performed in the frequency domain or in the time domain, as desired.

REFERENCES:
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Redfern, “A comparison of transparent physical layer Q-mode proposals”, submitted to St. Gr. 15, ques. 4, ITU Telecommunications Stand. Sector, Document RN-083 (May 2001).
Odling et al., “How Much PAR to Bring to the Party?”, NORSIG-2002, 5th Nordic Signal Processing Symposium (Oct. 2002).

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