Power control in a multicarrier communications system

Details Power control in a multicarrier communications system Power control in a multicarrier communications system

2006-04-17

2011-12-13

Wang, Ted (Department: 2611)

Pulse or digital communications

Systems using alternating or pulsating current

Plural channels for transmission of a single pulse train

C375S316000, C375S324000, C375S340000

Reexamination Certificate

active

08077780

ABSTRACT:
An improvement to multi-carrier communication, such as an OFDM and MC-CDMA system, where in a multipath or phase distorted channel, the received signal is flat with respect to frequency and linear with respect to phase. A first unit transmits a plurality of multi-carrier signals, which include unmodulated carrier signals. A second unit receives the plurality of multi-carrier signals, and determines the in-phase and quadrature amplitudes or powers of the unmodulated carrier signals of the received multi-carrier signal. The second unit compares the measured in-phase and quadrature amplitudes or powers of the unmodulated carrier signals to predetermined criteria, and generates adjusting data from the compared in-phase and quadrature amplitudes or powers. The first unit uses the adjusting data to pre-distort the next plurality of multi-carrier signals to be transmitted, the in-phase and quadrature amplitudes or powers of the plurality of multi-carrier signals. The first unit transmits, with the in-phase and quadrature phase adjusted per the adjusting data, the next plurality of multi-carrier signals, through the communications channel.

REFERENCES:
patent: 2005/0141598 (2005-06-01), Akita
patent: 2005/0202818 (2005-09-01), Hondo et al.

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