Multicarrier sub-layer for direct sequence channel and multiple-access coding

• US 7,965,761 B2
• Filed: 12/05/2008
• Issued: 06/21/2011
• Est. Priority Date: 02/12/1998
• Status: Expired due to Fees

• Current Assignee: Genghiscomm Holdings, LLC
• Original Assignee: Lot 41 Acquisition Foundation LLC (Intellectual Ventures LLC)
• Inventors: Shattil, Steve
• Primary Examiner(s): Bocure; Tesfaldet
• Assistant Examiner(s): Williams; Lawrence B
• Application Number:
  US12/328,917
• Publication Number:
  US 20090110033A1
• Time in Patent Office: 928 Days
• Field of Search: 375/130, 375/141, 375/144, 375146-147, 375/E1.001, 375259-260, 375/267, 375/316, 375/295, 370/57, 370/69.1, 370/120, 370/203, 370208-209, 370/277, 370/281, 370/295, 370/302, 370/310, 370/330, 370/343, 370/436, 370/478, 370/480, 370/482, 455/39, 455/45, 455/101, 455103-104
• US Class Current: 375/147
• CPC Class Codes: H04B 1/7174 Pulse generation in general H04L25/03834
• CPC Class Codes: H04B 7/0697 using spatial multiplexing
• CPC Class Codes: H04B 7/12 Frequency diversity
• CPC Class Codes: H04J 13/0077 Multicode, e.g. multiple codes assigned to one user
• CPC Class Codes: H04J 14/02 Wavelength-division multiplex systems
• CPC Class Codes: H04J 14/0298 with sub-carrier multiplexing [SCM]
• CPC Class Codes: H04L 1/04 using frequency diversity
• CPC Class Codes: H04L 27/2637 with direct modulation of individual subcarriers
• CPC Class Codes: H04L 27/2697 in combination with other modulation techniques
• CPC Class Codes: H04L 5/0021 in which codes are applied as a frequency-domain sequences, e.g. MC-CDMA

Abstract

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.

Claims

1. A carrier interferometry-code (CI-code) generator adapted to generate at least one CI code, the CI-code generator including:

a CI-symbol generator adapted to generate a plurality of CI symbols, and a symbol combiner coupled to the CI-symbol generator, the symbol combiner adapted to select at least one set of the CI symbols to generate at least one CI code.

2. The CI-code generator recited in claim 1 wherein the CI-symbol generator further includes a code processor adapted to process at least one set of CI-based symbols with at least one other symbol set to generate the plurality of CI symbols.

3. The CI-code generator recited in claim 2 wherein the code processor is adapted to process at least one set of CI-based symbols with at least one code of a code set including spread-spectrum codes, multiple-access codes, channel codes, sub-channel codes, encryption codes, multi-level codes, compression codes, hybrid codes, and CI codes.

4. A carrier interferometry (CI) transmitter adapted to encode at least one information signal with at least one CI code, the CI transmitter including:

a CI-code generator adapted to generate at least one CI code, a CI encoder coupled to the CI-code generator, the CI encoder adapted to impress at least one information signal onto the at least one CI code to generate at least one CI-encoded signal, and a transmission system coupled to at least one communication channel and at least one of the CI-code generator and the modulator, the transmission system adapted to process the at least one CI-encoded signal for transmission into the at least one communication channel.

5. The CI transmitter recited in claim 4 wherein the CI-code generator is adapted to generate at least one code of a code set including a multiple-access code, a spreading code, a channel code, an encryption code, a sub-channel code, an error-correction code, a hybrid code, a multi-level code, and a compression code.

6. A transmitter for a communication system including:

a carrier interferometry (CI) coder adapted to generate a plurality of algebraically unique linear combinations of a plurality of information signals, and a modulator adapted to impress each of the linear combinations onto a plurality of diversity-parameter values.

7. A carrier interferometry (CI) coder including:

a CI-code generator capable of generating a plurality of CI codes, a modulator adapted to modulate a plurality of information signals onto a plurality oldie CI codes, and a CI symbol generator adapted to combine a plurality of information-modulated CI-code chips to generate a plurality of CI symbols.

8. A carrier interferometry (CI) decoder including:

a CI-code generator capable of generating at least one reference CI code, and a combiner adapted to combine a plurality of received CI symbols relative to the at least one reference CI code to generate at least one estimated information signal.

9. A transmitter system including:

a carrier interferometry (CI) signal generator adapted to produce a plurality of information-bearing CI symbols distributed over at least a first set of diversity-parameter values, and a multi-element transmitter adapted to distribute the CI symbols over at least a second set of diversity-parameter values.

10. A transmitter system including:

a carrier interferometry-symbol (CI-symbol) generator adapted to generate a plurality of information-bearing CI symbols, a weighting system adapted to provide at least one weight to at least one of the CI symbols to perform at least one of a set of functions including time-domain shaping, frequency-domain shaping, crest-factor reduction, encryption, beam forming, and channel compensation, and a modulator adapted to impress the weighted CI symbols onto at least one set of diversity-parameter values.

11. A method of generating carrier interferometry (CI) signals including:

providing for channel estimation, providing for generating a plurality of CI carriers, and providing for pre-transmission processing of the CI carriers to provide channel compensation, based at least in part on a result of said channel estimation.

12. A software-defined carrier interferometry (CI) transmitter including:

at least one hardware component including at least one computer processing unit and at least one memory device adapted to support at least one software application program, and at least one software module including at least one application program adapted to, upon execution by the at least one computer processing unit, cause the CI transmitter to perform carrier selection and carrier weighting such that a superposition of the weighted carriers is provided with at least one of a set of predetermined signal parameters, the set including formatting, source coding, encryption, sub-channel coding, channel coding, multiplexing, modulation, spread-spectrum coding, and multiple-access coding.