Bandwidth-efficient waveforms for line-of-sight communications

A family of power- and bandwidth-efficient waveforms, suitable for fading multipath channels is described. A relatively high rate serially-concatenated convolutional code is paired with either QAM or non-recursive partial-response CPM. When using CPM, the receiver employs a simplified soft-output demodulator. The performance and implementation impacts of multiple receiver architectures, including iterative demapping, iterative demodulation, and iterative equalization are examined. A block equalizer is used to mitigate intersymbol interference effects. The waveform permits a relatively simple, yet flexible, receiver design, that achieves high performance in real-world channels. Performance and implementation considerations are discussed.