Spectrum Shaping Using Code-hopping CDMA
October 2004
Ali Saidi, The MITRE Corporation
ABSTRACT
Spectral shaping is one of the primary technical challenges in
spectrally constrained multiple access applications. In this
paper, we introduce an efficient orthogonal CDMA-based
spectral shaping technique. In our approach, termed Code-
Hopping CDMA, users are allowed to hop between available
spreading codes in an orthogonal fashion with different
frequencies. We show that code hoping patterns can be chosen
such that the power spectral density of the resulting signal would
approximate a predetermined desired shape. We will
demonstrate our approach through two examples and analyze the
impact of the hopping pattern on the system capacity.
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