Power and spectrally efficient four-dimensional super-orthogonal WCDMA building block for next generation wireless applications

This letter introduces a versatile multi-code multidimensional super-orthogonal wideband code division multiple access (MC-MD-SO- WCDMA) multi-layered-modulation (MLM) scheme, employing families of root-of-unity filtered (RUF) generalized-chirp-like (GCL) constant-envelope complex spreading sequences (GCL-CE-CSS), including recently derived families of super-orthogonal (SO) GCL-CE-CSS with zero cross-correlation (ZCC) properties. The latter sequences facilitate multi-user-interference (MUI) free demodulation and detection. It is shown that the resulting MC-MD-SO-WCDMA signal simultaneously exhibits a spectrally efficient minimum (Nyquist) bandwidth output power spectral density (PSD) and a near constant instantaneous power output signal, yielding significant spectral and power efficiency advantages over existing single and multi-carrier multi-level quadrature-amplitude-modulated (M-QAM) WCDMA and OFDM modulation standards.