Adaptive modulation for wireless networks

Details Adaptive modulation for wireless networks Adaptive modulation for wireless networks

2003-02-25

2008-03-11

Payne, David C. (Department: 2611)

Pulse or digital communications

Transceivers

C375S232000, C375S342000, C375S261000, C375S130000, C375S222000, C370S286000, C370S287000

Reexamination Certificate

active

07342954

ABSTRACT:
The invention relates to communication between terminals. Where communication is over an ideal channel then a high throughput modulation scheme can be used. Where the terminals suffer interference or noise, transmission can be modified to a more robust modulation scheme. The modulation scheme for a signal to be transmitted from the terminal is normally selected based up measurements made on a signal received by the terminal. However, the uplink and downlink between two terminals may not be experiencing the same interference and noise. For example, an interfering source may affect one terminal more than another. Under these circumstances, the terminal will not get a good picture of the status of the channel or link over which it is about to transmit. Therefore, the invention provides a system where quality information is passed from the terminal receiving a signal to the terminal which sent the signal to help to determine the most appropriate modulation scheme.

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