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This paper proposes a novel modulation format that results in a constant envelope when orthogonal multicode spread-spectrum signals are linearly combined. This feature is desirable for the use of a low-cost nonlinear amplifier in a high-data-rate multiple access system, especially on the uplink of cellular systems. To allow coherent demodulation, per-symbol detection is introduced to the constant envelope modulation (CEM), which increases receiver complexity modestly compared to conventional bit-by-bit detection. Analysis of the multiuser performance reveals superiority to an ideal system without nonlinear distortion, and significant improvement when nonlinearity is taken into account.
Global Telecommunications Conference, 1999. GLOBECOM '99 (Volume:5 )
Date of Conference: 1999