Space-time coding for multi-antenna ultra-wideband transmissions
First Claim
1. A method comprising:
- processing a stream of information-bearing symbols to form a plurality of symbol blocks, wherein each symbol block comprises more than one of the information bearing symbols;
generating multiple ultra-wideband (UWB) waveforms from the symbol blocks, wherein each of the UWB waveforms convey the symbols of their respective symbol blocks as pulses repeated over a plurality of frames; and
transmitting the UWB waveforms over different antennas as a space-time coded UWB communication.
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Abstract
Space-time (ST) coding techniques are described for multi-antenna transmissions in ultra-wideband (UWB) communication systems. The ST coding schemes may, therefore, be tailored for dense multipath channels. The techniques may be applied with linear and nonlinear modulation, coherent and noncoherent reception, and block interleaving of symbols. An UWB communication system is described that includes an ST encoder at the transmitter, multiple transmit and receive antennas, and two-step maximum ratio combining (MRC) at the receiver. The two-step MRC enables the receiver to collect full spatial and multipath diversity from a transmission. Two coding schemes for an UWB system with two transmit antennas and one receive antenna are described. Multiple antenna transmissions of ST encoded symbols increase the amount of diversity a receiver is able to collect without increasing the complexity of the receiver.
27 Citations
27 Claims
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1. A method comprising:
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processing a stream of information-bearing symbols to form a plurality of symbol blocks, wherein each symbol block comprises more than one of the information bearing symbols; generating multiple ultra-wideband (UWB) waveforms from the symbol blocks, wherein each of the UWB waveforms convey the symbols of their respective symbol blocks as pulses repeated over a plurality of frames; and transmitting the UWB waveforms over different antennas as a space-time coded UWB communication. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method comprising:
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processing a stream of information-bearing symbols to form a plurality of symbol blocks, wherein each symbol block comprises one or more of the information bearing symbols; generating multiple ultra-wideband (UWB) waveforms from the symbol blocks, wherein each of the UWB waveforms convey the symbols of their respective symbol blocks as pulses repeated over a plurality of frames; transmitting the UWB waveforms over different antennas as a space-time coded UWB communication, wherein processing a stream of information-bearing symbols comprises duplicating each symbol to form a first symbol block and a second symbol block each comprising the same information bearing symbol, wherein generating multiple UWB waveforms comprises generating a first UWB waveform from the first symbol block and a second UWB waveform from the second symbol block, and wherein transmitting the UWB waveforms comprises simultaneously transmitting the first UWB waveform from a first transmit antenna and the second UWB waveform from a second transmit antenna.
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12. A wireless communication device comprising:
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a space-time (ST) encoder that processes a stream of information-bearing symbols to form a plurality of ST-encoded symbol blocks, wherein each symbol block comprises more than one of the information bearing symbols; a plurality of pulse shapers that generate multiple ultra-wideband (UWB) waveforms from the symbol blocks, wherein each of the UWB waveforms convey the symbols of their respective symbol blocks as pulses repeated over a plurality of frames; and a plurality of antennas that transmit the UWB waveforms over a wireless communication channel. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19)
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20. A wireless communication device comprising:
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a space-time (ST) encoder that processes a stream of information-bearing symbols to form a plurality of ST-encoded symbol blocks, wherein each symbol block comprises one or more of the information bearing symbols; a plurality of pulse shapers that generate multiple ultra-wideband (UWB) waveforms from the symbol blocks, wherein each of the UWB waveforms convey the symbols of their respective symbol blocks as pulses repeated over a plurality of frames; a plurality of antennas that transmit the UWB waveforms over a wireless communication channel, wherein the ST encoder duplicates each symbol to form a first symbol block and a second symbol block each comprising the same information bearing symbol, and the plurality of pulse generators generate a first UWB waveform from the first symbol block and a second UWB signal from the second symbol block for simultaneous transmission via the plurality of antennas.
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21. A wireless communication device comprising:
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a plurality of antennas to receive a plurality of space-time (ST) encoded ultra wideband (UWB) waveforms through a wireless communication channel, each ST encoded UWB waveform having a plurality of information-bearing symbols within a symbol block that are conveyed as pulses repeated over a plurality of frames; and a maximum ratio combining (MRC) unit that processes the ST encoded UWB signals and produces a stream of estimate symbols. - View Dependent Claims (22, 23, 24)
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25. An ultra-wideband communication system comprising:
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a transmitter that outputs a plurality of space-time (ST) encoded ultra wideband (UWB) waveforms via a plurality transmit antennas, each ST encoded UWB waveform having a plurality of information-bearing symbols within a symbol block that are conveyed as pulses repeated over a plurality of frames; and a receiver that receives the plurality of ST-encoded UWB waveforms via a wireless communication channel, and performs maximum ratio combining (MRC) on the UWB signals to produce estimate symbols. - View Dependent Claims (26, 27)
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Specification