The paper proposes a DAFT-spread affine frequency division multiple access (DAFT-s-AFDMA) scheme for downlink transmission. The key highlights are:
The DAFT-s-AFDMA scheme uses the DAFT to preprocess the signal of each user in the discrete affine Fourier (DAF) domain, and then applies the inverse DAFT to transform the signal into the time domain. This helps significantly reduce the PAPR compared to the conventional orthogonal AFDMA (O-AFDMA) scheme.
The paper derives the time-domain transmitted signal expressions for the proposed DAFT-s-AFDMA schemes with localized and interleaved chirp subcarrier allocation strategies. It also analyzes the parameter settings of the DAFT to achieve PAPR reduction.
Simulation results show that both the DAFT-s-AFDMA schemes with localized and interleaved strategies have lower PAPR than O-AFDMA. The DAFT-s-AFDMA scheme with interleaved strategies can achieve the same bit error rate (BER) performance as the O-AFDMA system.
The interleaved DAFT-s-AFDMA scheme is able to reduce the system PAPR without BER performance loss, making it a promising multiple access technique for high-mobility scenarios.
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