Multi-carrier transmitter for ultra-wideband (UWB) systems
AssigneeTexas Instruments Incorporated
InventorsAnand G. Dabak, Anuj Batra
Life of this patent
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Abstract
System and method for a multi-carrier ultra-wideband (UWB) transmitter. A preferred embodiment comprises an UWB transmitter (for example, transmitter 300) taking advantage of both code division multiple access (CDMA) (for example, block 305) and orthogonal frequency division multiplexing (OFDM) (for example, block 315) techniques to create a multi-carrier UWB transmitter. The multi-carrier UWB is capable of avoiding interferers by eliminating signal transmissions in the frequency bands occupied by the interferers. An alternate embodiment using intermediate frequencies and mixers is also presented.
Claims29
A method for providing ultra-wideband wireless communications comprising:
- arranging ultra-wideband data stream into a plurality of tones, each tone comprising a sub-frequency range, wherein the sub-frequency ranges are portions of a total available transmission bandwidth;
- adjusting a signal magnitude by a compensator for each of the plurality of sub-frequency ranges to compensate for a transmit antenna's frequency selectivity with a gain that is different for each sub-frequency range;
- transforming the arranged data into a time domain signal;
- converting the time domain signal into an analog signal;
- and
- transmitting the analog signal.
A method for providing ultra-wideband wireless communications comprising:
- arranging ultra-wideband data stream into a plurality of tones, each tone comprising a sub-frequency range, wherein the sub-frequency ranges are portions of a total available transmission bandwidth;
- partitioning the data stream by a data partitioner into I portions, where I is a number of data bits taken from the data stream and multiplied with the orthogonal spreading code;
- placing the I partitions into I sub-frequency ranges out of a total of I+N sub-frequency ranges, where N is a number of zero pad sub-frequency ranges;
- putting a special value into the N remaining sub-frequency ranges;
- transforming the arranged data into a time domain signal;
- converting the time domain signal into an analog signal;
- and
- transmitting the analog signal.
An ultra-wideband transmitter comprising:
- a data input;
- a data spreader having an input coupled to the data input and an output coupled to the data partitioner, the data spreader containing circuitry to multiply the data stream with an orthogonal spreading code;
- an interleaver having an input coupled to the data spreader and an output coupled to the data partitioner, the interleaver containing circuitry to collect every data tone from the output of the data spreader and place it into one of J storage locations, wherein J is an order of the interleaver;
- a data partitioner coupled to the data input, the data partitioner containing circuitry to partition a data stream provided by the data input into a plurality of tones comprising respective individual sub-frequency ranges;
- a digital-to-analog converter (DAC) coupled to the data partitioner, the DAC containing circuitry to convert a digital data stream into an analog signal stream;
- and
- an antenna coupled to the DAC, the antenna used to transmit the analog signal stream.
An ultra-wideband transmitter comprising:
- a data input;
- a data partitioner coupled to the data input, the data partitioner containing circuitry to partition a data stream provided by the data input into a plurality of tones comprising respective individual sub-frequency ranges;
- a compensator having an input coupled to a data spreader, the compensator containing circuitry to adjust a signal gain in each of the individual sub-frequency ranges;
- a zero pad unit having an input coupled to an output of the compensator, the zero pad unit containing circuitry to append zero valued sub-frequency ranges to the output of the compensator;
- an inverse Discrete Fourier transform unit having an input coupled to an output of the zero pad unit, the inverse Fourier transform unit containing circuitry to convert the output of the zero pad unit into a time domain representation;
- a digital-to-analog converter (DAC) coupled to the data partitioner, the DAC containing circuitry to convert a digital data stream, into an analog signal stream;
- and
- an antenna coupled to the DAC, the antenna used to transmit the analog signal stream.
Dependencies are inferred from the claim text.