Multicarrier sub-layer for direct sequence channel and multiple-access coding
View Patent ↗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.
1. A receiver system including:
a multiple-element receiver to generate a plurality of interfering received signals relative to at least a first set of diversity-parameter values,
at least one filter band adapted to separate the plurality of interfering received signals into a plurality of carrier interferometry (CI) components relative to at least a second set of diversity-parameter values, and
a combiner adapted to combine the plurality of CI components with the at least first set of diversity-parameter values to produce a plurality of combined CI components, the combiner further adapted to combine the plurality of combined CI components with the at least second set of diversity-parameter values to produce at least one estimate information signal.
2. A communication apparatus comprising:
a carrier interferometry (CI)-based radio receiver configured according to a computer-based system including:
at least one hardware component including at least one computer processing unit and at least one memory device adapted to support software module; and
at least one software module, to be supported by said at least one memory device including at least one software application program adapted to perform carrier selection and carrier weighting such that a superposition of any of a plurality of weighted carriers is provided with at least one of a set of predetermined signal parameters, the set including formatting, source decoding, decryption, sub-channel decoding, channel decoding, demultiplexing, demodulation, spread-spectrum decoding, and multiple-access decoding.