Method and apparatus for phase-aided adaptive modulation
AssigneeTelefonaktiebolaget LM Ericsson (publ)
InventorsMartin Sjödin, Björn Gävert
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Abstract
The present invention relates to a method and apparatus in a digital communication system that employs phase-aided adaptive modulation to overcome phase noise impairments. The transceiver is configured to transmit a message comprising channel symbols from a primary and a secondary set of channel symbols, wherein the primary set of channel symbols comprises channel symbols having different phase with respect to one another and the secondary set of channel symbols comprises only channel symbols with a fixed known phase.
Claims12
A transceiver for phase-aided communication, the transceiver comprising a radio transmitter configured to transmit a message comprising channel symbols from a primary and a secondary set of channel symbols, wherein:
- the primary set of channel symbols comprises channel symbols having different phase with respect to one another;
- the secondary set of channel symbols comprises only channel symbols with a fixed known phase, wherein the channel symbols of the secondary set have a minimum signal energy that is dependent on signal-to-noise-ratio or signal-to-interference-and-noise-ratio;
- and
- the primary set is the default channel symbol set and the secondary set is selected based on a predetermined sequence or with regard to the level of phase noise.
A method in a transceiver, the transceiver being configured to transmit a message comprising channel symbols from a primary and a secondary set of channel symbols, the method comprising the steps of:
- selecting a channel symbol from either the primary or the secondary set of channel symbols, wherein the primary set of channel symbols comprises channel symbols having different phase with respect to one another and is the default channel symbol set, and the secondary set of channel symbols comprises only channel symbols with a fixed known phase and is selected based on a predetermined sequence or with regard to the level of phase noise, wherein the channel symbols of the secondary set have a minimum signal energy that is dependent on signal-to-noise-ratio or signal-to-interference-and-noise-ratio;
- and
- transmitting the channel symbol.
Dependencies are inferred from the claim text.