Complexity Constrained Noise-Free CDMA: Optimal Power Distribution and Spectral Efficiency

The issue of multiuser cooperation in a complexity constrained noise-free CDMA channel is addressed. Multiuser cooperation is imperative if conventional demodulation is expected to be error free for non-orthogonal spreading sequences. It is found that for such a constraint the power distribution ensuring the most fruitful cooperation is that which assigns equal power to all users. As a result the asymptotic capacity and spectral efficiency are highest when all users transmit with the same amplitude. It is also shown that for such a complexity constrained channel the asymptotic spectral efficiency is a boundless monotonically increasing function of the channel load.

• Type: Journal
• Year: 2006
• Where: CORR
• Authors: Rodrigo de Miguel, Ralf R. Müller
• Keywords: CORR 2006, Education, Multiuser Cooperation, Noise-free Cdma Channel, Spectral Efficiency