Carrier Interferometry (CI) provides
wideband transmission protocols with frequency-band selectivity to improve interference rejection, reduce multipath
fading, and enable operation across non-continuous frequency bands. Direct-sequence protocols, such as DS-CDMA, are provided with CI to greatly improve performance and reduce
transceiver complexity. CI introduces families of orthogonal polyphase codes that can be used for channel coding, spreading, and / or multiple access. Unlike conventional DS-CDMA, CI coding is not necessary for energy spreading because a set of CI carriers has an inherently wide aggregate bandwidth. Instead, CI codes are used for channelization, energy
smoothing in the
frequency domain, and interference suppression. CI-based ultra-
wideband protocols are implemented via frequency-domain
processing to reduce synchronization problems,
transceiver complexity, and poor multipath performance of conventional ultra-
wideband systems. CI allows wideband protocols to be implemented with space-frequency
processing and other array-
processing techniques to provide either or both
diversity combining and sub-space processing. CI also enables spatial processing without antenna arrays. Even the bandwidth efficiency of multicarrier protocols is greatly enhanced with CI. CI-based wavelets avoid time and
frequency resolution trade-offs associated with conventional
wavelet processing. CI-based Fourier transforms eliminate all multiplications, which greatly simplifies multi-frequency processing. The
quantum-wave principles of CI improve all types of
baseband and radio processing.