Multi-user interference resilient ultra wideband (UWB) communication
First Claim
1. A method comprising:
- generating a stream of frames from blocks of information bearing symbols by applying an orthogonal set of spreading codes to the block of information bearing symbols to form frames and interleaving the frames corresponding to different block of information bearing symbols to form the stream of frames;
generating a stream of chips from the stream of frames by applying an orthogonal set of time-hopping spreading codes to the stream of frames to form chips and interleaving the chips corresponding to different frames to form the stream of chips; and
outputting an ultra wideband (UWB) transmission signal from the stream of chips.
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Abstract
Techniques are described for maintaining the orthogonality of waveforms transmitted in ultra wideband (UWB) multi-user wireless communication systems. The multi-stage block-spreading (MS-BS) techniques described herein deterministically eliminate multiple user interference (MUI) in the presence of frequency-selective fading channels. A transmitter includes a block-spreading unit to generate a stream of frames from a block of information bearing symbols by applying an orthogonal set of spreading codes, such as direct sequence cod& division multiple access (CDMA) codes or digital carrier frequency multiple access codes, such that the frames corresponding to different blocks of the symbols are interleaved. The transmitter further includes a time-hopping spreading unit to generate a stream of chips from the stream of frames by applying an orthogonal set of time-hopping (TH) spreading codes such that chips corresponding to different frames are interleaved.
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Citations
27 Claims
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1. A method comprising:
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generating a stream of frames from blocks of information bearing symbols by applying an orthogonal set of spreading codes to the block of information bearing symbols to form frames and interleaving the frames corresponding to different block of information bearing symbols to form the stream of frames; generating a stream of chips from the stream of frames by applying an orthogonal set of time-hopping spreading codes to the stream of frames to form chips and interleaving the chips corresponding to different frames to form the stream of chips; and outputting an ultra wideband (UWB) transmission signal from the stream of chips. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A wireless communication device comprising:
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a multiple-user block-spreading unit that generates a set of frames for respective blocks of information bearing symbols by applying an orthogonal set of spreading codes to the block of information symbols and produces a stream of frames in which the frames from different sets are interleaved; a time-hopping block-spreading unit that generates a set of chips for each frame by applying an orthogonal set of time-hopping spreading codes to the stream of frames and outputs a stream of chips in which the chips generated from different frames are interleaved; and a pulse shaping unit to output an ultra wideband (UWB) transmission signal from the stream of chips. - View Dependent Claims (18, 19, 20, 21, 22)
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23. A wireless communication device comprising a two-stage despreading unit that processes a received ultra wideband (UWB) transmission signal to produce estimate symbols, wherein the received UWB signal comprises a multi-user block-spread UWB signal formed from interleaved symbol frames and interleaved chips within the symbol frames, and wherein the two-stage despreading unit comprises:
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a time-hopping de-spreading module that applies a first de-spreading matrix to de-interleave the chips into blocks of frames; and a multi-user de-spreading module that applies a second de-spreading matrix to de-interleave the frames and produce blocks of estimate symbols. - View Dependent Claims (24)
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25. A system comprising:
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a wireless transmitter to transmit an ultra wideband (UWB) signal according to interleaved chips generated from interleaved frames produced by blocks of information bearing symbols, wherein the transmitter comprises; a multiple-user block-spreading unit that generates a set of frames for respective blocks of information bearing symbols by applying an orthogonal set of spreading codes to the block of information bearing symbols and produces a stream of frames in which the frames from different sets are interleaved; a time-hopping block-spreading unit that generates a set of chips for each of the frames by applying an orthogonal set of time-hopping spreading codes to the interleaved frames and outputs a stream of chips in which the chips generated from different frames are interleaved; and a pulse shaping unit to output the UWB transmission signal from the stream of interleaved chips; and a wireless receiver to receive the UWB signal and de-interleave the chips and frames to produce estimate symbols.
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26. A system comprising:
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a wireless transmitter to transmit an ultra wideband (UWB) signal according to interleaved chips generated from interleaved frames produced by blocks of information bearing symbols; and a wireless receiver to receive the UWB signal and dc-interleave the chips and frames to produce estimate symbols, wherein the receiver comprises; a time-hopping de-spreading module that applies a first de-spreading matrix to the UWB signal to de-interleave chips into blocks of frames; and a multi-user de-spreading module that applies a second de-spreading matrix to de-interleave the frames and produce blocks of estimate symbols.
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27. A computer-readable medium comprising instructions to cause a programmable processor of a wireless communication device to:
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generate a stream of frames from blocks of information bearing symbols by applying an orthogonal set of spreading codes to the block of information bearing symbols to form the frames and interleaving the frames corresponding to different block of information bearing symbols to form frames; generate a stream of chips from the stream of frames by applying an orthogonal set of time-hopping spreading codes to the stream of frames to form chips and interleaving the chips corresponding to different frames to form the stream of chips; and output an ultra wideband (UWB) transmission signal from the stream of chips.
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Specification