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US 7,317,750 B2Granted
Orthogonal superposition coding for direct-sequence communications
AssigneeLot 41 Acquisition Foundation, LLC
InventorSteve J Shattil
Life of this patent
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Abstract
An adaptation to Carrier Interferometry synthesis and analysis provides for complex coding and decoding in a sliding window transform. Coding and decoding functionality can be extended to spatial processing in systems employing multiple transceiver elements. Poly-amplitude codes permit successive interference cancellation in spatial and frequency-domain processing. Handoffs in cellular systems are facilitated by selecting spectral/base station combinations that optimize link performance.
Claims14
A multi-carrier communications transmitter including:
- a sub-carrier allocator adapted to allocate at least one set of subcarriers for communication,
- a pulse generator to be coupled to the sub-carrier allocator, the pulse generator adapted to generate a plurality of pulses having spectral components corresponding to the at least one set of subcarriers, wherein the pulse generator comprises:
- a subcarrier weighting module to impress at least one set of complex weights generated from at least one carrier interferometry code onto the at least one set of subcarriers to generate a plurality of weighted subcarriers;
- and
- a sub-carrier combiner adapted to combine the weighted subcarriers to produce the plurality of pulses;
- a modulator to be coupled to at least one of the sub-carrier allocator and the pulse generator, the modulator adapted to impress at least one data symbol onto the plurality of pulses, and
- a sequential pulse positioner to be coupled to at least one of the sub-carrier allocator, the pulse generator, and the modulator, the sequential pulse positioner to sequentially position the plurality of pulses.
4 more elements
A method of transmitting data symbols, comprising:
- generating at least one set of weighted, orthogonal sub-carriers spaced apart in frequency, said generating including weighting the sub-carriers using complex sub-carrier weights generated from one or more carrier interferometry (CI) codes;
- and
- modulating the sub-carriers by sequential, overlapping data symbols to obtain modulated sub-carriers,
- wherein the data symbols are mapped to a plurality of pulse positions within a sequence of modulated pulses with spectral components characterized by the sub-carriers.
1 more element
Dependencies are inferred from the claim text.