EFFICIENT MODULATION CONTROL
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United States of America Patent
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Issued Date -
Oct 19, 2023
app pub date -
Oct 4, 2021
filing date -
Oct 5, 2020
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Abstract
To fully enjoy the benefit of adaptive modulation or bit loading in a multi-carrier wireless communication system, a bit loading control method (700) is disclosed to reduce the system complexity and signaling overhead by making use of an attribute of the communication channel, which has a declining channel response with increasing frequency. Instead of applying adaptive bit loading on a per subcarrier basis, the disclosed method (700) obtains (S703) an estimated channel response based a test signa; and determines (S704) according to the estimated channel response a bit loading scheme for allocating the plurality of subcarriers into one or more non-overlapping frequency segments. For each frequency segment, an individual modulation scheme is assigned, which is shared by the more than one adjacent subcarrier comprised in the same frequency segment. The monotonicity of the channel response is used to accelerate the algorithm, as well as to make control information more compact.
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