System and method for orthogonally multiplexed signal transmission and reception on a non-contiguous spectral basis
AssigneeScientific Research Corporation
InventorsFredric J. Harris, Erik H. Kjeldsen
Life of this patent
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Abstract
A wireless communication system implements Forward Error Correction (“FEC”) and Interpolated Tree Orthogonal Multiplexing (“ITOM”). ITOM is a compact spectral waveform variant that uses a dyadic tree structure. The tree structure facilitates a flexible mapping of the transmit waveform to the available spectrum bandwidth on a non-contiguous and multiresolution basis. The system includes a receiver that implements a maximum likelihood (“ML”) synchronization scheme, which is pulse shape independent and non-data aided.
Claims38
A wireless communication system, comprising:
- a transmitter for transmitting a radio frequency signal to a receiver, the transmitter including:
- a forward error correction (“FEC”) encoder for encoding input bits to generate encoded symbols;
- a complex symbol mapper for mapping the encoded symbols into complex-valued transmission symbols;
- a demultiplexer for generating parallel output symbols from the complex-valued transmission symbols;
- an adaptive interpolated tree orthogonal multiplexing (“ITOM”) component for receiving the parallel output symbols and generating an orthogonal multiplexed complex symbol stream at a given sample rate, wherein the ITOM component uses a filter bank tree that spectrally shapes the parallel output symbols to available channel bandwidth on a non-contiguous basis and selectively merges contiguous occupied subbands;
- and
- a signal processing component for generating the radio frequency signal from the orthogonal multiplexed complex symbol stream.
A method for communicating radio frequency signals, comprising:
- shaping a waveform, using null-valued inputs to a filter bank tree associated with an interpolated tree orthogonal multiplexing (“ITOM”) component, for operation on a non-contiguous spectral basis;
- pruning the filter bank tree associated with the ITOM component to merge two or more contiguous occupied subbands for multiresolution orthogonal multiplexing;
- generating an orthogonal multiplexed complex symbol stream using the shaped waveform from the ITOM component;
- and
- transmitting a radio frequency signal derived from the orthogonal multiplexed complex symbol stream.
A wireless communication system, comprising:
- a transmitter for transmitting a radio frequency signal to a receiver, the transmitter including an adaptive interpolated tree orthogonal multiplexing (“ITOM”) component for receiving parallel symbols and generating an orthogonal multiplexed complex symbol stream at a given sample rate, wherein the ITOM component includes a filter bank tree to spectrally shape the waveform to available bandwidth on a non-contiguous basis and to selectively merge occupied contiguous subbands,
- wherein the filter bank tree performs spectral shaping at each of a plurality of tree branch entry points of the filter bank tree and spectral replicate filtering at each of a plurality of upsampling stages of the filter bank tree.
Dependencies are inferred from the claim text.