Timing-spectrum space coding for cdma communications

Abstract

This invention is about using the timing or phase relationship of a special type of wavelet to encode information bits. The special type of wavelets is constructed from a CDMA code, such as a PN code sequence, that has sufficiently good auto correlation and cross correlation properties. The wavelet, having such properties, would tend to have a large space of detectable or distinguishable phases. The wavelet can be either, phase rotated or timing shifted to encode information bits. For example, a wavelet constructed from a PN code of 16 chips may be able to encode 10 information bits, if the noise level permits. The newly utilized vector space (the time domain or phase domain of this type of wavelets) for information bits encoding has substantially increased the spectral efficiency in communication systems.

Dependencies are inferred from the claim text.