CPC H04L 27/2636 (2013.01) [H04B 7/0456 (2013.01); H04B 7/0632 (2013.01); H04L 1/1861 (2013.01); H04W 72/20 (2023.01); H04L 5/0007 (2013.01)] | 27 Claims |
1. An apparatus, comprising:
a code-division multiplexer configured to assign a different codeword set to each of a plurality of data streams, each codeword set comprising a different one of a plurality of spread-Discrete Fourier Transform (DFT) code division multiple-access channels;
a DFT spreader configured to spread the each of the plurality of data streams with its assigned codeword set to produce a plurality of DFT-spread data symbols;
a mapper configured to map the plurality of DFT-spread data symbols to a plurality of Orthogonal Frequency Division Multiplexing (OFDM) subcarriers;
an inverse discrete Fourier transform (IDFT) configured to modulate the plurality of DFT-spread data symbols onto the plurality of OFDM subcarriers to generate an OFDM signal; and
a cyclic-prefix appender configured to append a cyclic prefix to the OFDM signal to produce a transmission signal; wherein the code-division multiplexer and the DFT spreader configure the OFDM signal to have a low peak-to-average-power ratio (PAPR); and wherein the cyclic-prefix appender produces the cyclic prefix from the OFDM signal to provide the transmission signal with a low PAPR.
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