Pulse or digital communications – Systems using alternating or pulsating current – Plural channels for transmission of a single pulse train
Reexamination Certificate
2006-01-24
2008-10-21
Ahn, Sam K (Department: 2611)
Pulse or digital communications
Systems using alternating or pulsating current
Plural channels for transmission of a single pulse train
Reexamination Certificate
active
07440509
ABSTRACT:
A family of methods for interference averaging in multicarrier systems, such as orthogonal frequency division multiplexing (OFDM) systems. The methods can provide interference averaging in situations where an interfering co-channel is either partially or fully loaded. For partially loaded systems, subcarrier puncturing, frequency domain repetition, time domain repetition, and hybrid time-frequency repetition schemes are provided. For systems using adaptive modulation/coding rates, lower rates and transmit power can be selected in order to perform interference averaging in time-spread and frequency-spread OFDM schemes. In systems with downlink power control, frequency domain mixing can be used to perform interference averaging.
REFERENCES:
patent: 2002/0154705 (2002-10-01), Walton et al.
Wong et al. Multiuser OFDM with Adaptive Subcarrier, Bit and Power Allocation, IEEE, vol. 17, No. 10, Oct. 1999, p. 1747-1757.
Ahn Sam K
Motorola Inc.
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