Network node, and methods performed thereby for determining modulation symbols
AssigneeTelefonaktiebolaget LM Ericsson (publ)
InventorRobert Baldemair
Life of this patent
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Abstract
A method, performed by a network node. The method is for determining modulation symbols. The network node includes a modulator based on Discrete-time Fourier Transform Spread (DFTS)-Orthogonal Frequency-Division Multiplexing (OFDM). The network node determines modulation symbols to be input into the modulator. Of a first set of the modulation symbols corresponding to a duration of a DFTS-OFDM symbol, only a first subset of modulation symbols are set to first values of magnitude exceeding zero by a first threshold. The modulation symbols in the first subset are determined to have a first contiguity arrangement. The network node then initiates providing the determined modulation symbols to the modulator.
Claims19
A method, performed by a network node, the method being for determining modulation symbols, the network node comprising a modulator based on Discrete-time Fourier Transform Spread, DFTS, Orthogonal Frequency-Division Multiplexing, OFDM, the method comprising:
- determining modulation symbols to be input into the modulator such that, of a first set of the modulation symbols corresponding to a duration of a DFTS-OFDM symbol, only a first subset of modulation symbols are set to first values of magnitude exceeding zero by a first threshold, the modulation symbols in the first subset being determined to have a first contiguity arrangement, at least half of the modulation symbols in the first subset of the first contiguity arrangement adjacent to another modulation symbol in the first subset, the first contiguity arrangement being that all the modulation symbols in the first subset are contiguous and the determined modulation symbols enabling the modulator to process the modulation symbols and generate an output waveform comprising a pulse having an effective duration shorter than the OFDM symbol duration;
- initiating providing the determined modulation symbols to the modulator;
- the network node being capable of radio detection and ranging system, RADAR, operation and the method further comprising mapping modulation symbols of a desired RADAR pulse only to a contiguous fraction of DFTS-OFDM input modulation symbols;
- and generating RADAR pulses that are shorter in duration than the OFDM symbol duration, thereby reducing a minimum sensing distance of the network node.
A network node, for determining modulation symbols, the network node comprising a modulator configured to be based on Discrete-time Fourier Transform Spread, DFTS, Orthogonal Frequency-Division Multiplexing, OFDM, the network node being further configured to:
- determine modulation symbols to be input into the modulator such that, of a first set of the modulation symbols configured to correspond to a duration of a DFTS-OFDM symbol, only a first subset of modulation symbols are configured to be set to first values of magnitude exceeding zero by a first threshold, the modulation symbols in the first subset being configured to have a first contiguity arrangement, at least half of the modulation symbols in the first subset of the first contiguity arrangement adjacent to another modulation symbol in the first subset, the first contiguity arrangement being that all the modulation symbols in the first subset are contiguous and the determined modulation symbols enabling the modulator to process the modulation symbols and generate an output waveform comprising a pulse having an effective duration shorter than the OFDM symbol duration;
- initiate providing the modulation symbols configured to be determined to the modulator;
- the network node being capable of radio detection and ranging system, RADAR, operation and configured to map modulation symbols of a desired RADAR pulse only to a contiguous fraction of DFTS-OFDM input modulation symbols;
- and generate RADAR pulses that are shorter in duration than the OFDM symbol duration, thereby reducing a minimum sensing distance of the network node.
Dependencies are inferred from the claim text.