Wireless system with transmitter having multiple transmit antennas and combining open loop and closed loop transmit diversities
AssigneeTexas Instruments Incorporated
InventorsAnand G. Dabak, Srinath Hosur
Life of this patent
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Abstract
A wireless communication system (40). The system comprises transmitter circuitry (42) comprising encoder circuitry (44) for receiving a plurality of symbols (Si). The system further comprises a plurality of antennas (AT1-AT4) coupled to the transmitter circuitry and for transmitting signals from the transmitter circuitry to a receiver (UST), wherein the signals are responsive to the plurality of symbols. Further, the encoder circuitry is for applying open loop diversity and closed loop diversity to the plurality of symbols to form the signals.
Claims78
A wireless communication system, comprising:
- transmitter circuitry comprising encoder circuitry for receiving a plurality of symbols;
- a plurality of antennas coupled to the transmitter circuitry and for transmitting signals from the transmitter circuitry to a receiver, wherein the signals are responsive to the plurality of symbols;
- and
- wherein the encoder circuitry is for applying space time block coded transmit antenna open loop diversity and closed loop diversity to the plurality of symbols to form the signals;
- wherein the plurality of antennas comprises a pluraltty plurality of sets of antennas;
- wherein for each of the sets of antennas the encoder circuitry is for applying space tile time block coded transmit antenna diversity to selected ones of the plurality of symbols such that signals transmitted by any one antenna in the set of antennas represent open loop diversity with respect to signals transmitted by any other antenna in the set of antennas;
- and
- wherein for each of the sets of antennas the encoder circuitry is for applying a weight to the plurality of symbols such that signals fitted in response to the weight represent a closed loop diversity with respect to signals transmitted by any other antenna in any other of the sets of antennas.
A wireless communication receiver for receiving signal from transmitter circuitry transmitting along a plurality of sets of transmit antennas, wherein the signals are formed by the transmitter circuitry by applying space time block coded transmit antenna diversity to selected ones of the plurality of symbols such that signals transmitted by any one antenna in the set of antenas represent space time block coded open loop diversity with respect to signals transmitted by any other antenna in the set of antennas and wherein for each of the sets of antennas the encoder circuitry is for applying a weight to the plurality of symbols such that signals transmitted in response to the weight represent a closed loop diversity with respect to signals transmitted by any other antenna in any other of the uses of antennas, the receiver comprising
- a despreader having an output and for producing a despread symbol stream at the output in response to the signals;
- and
- decoder circuitry coupled to the output of the despreader and for decoding space time block coded open loop diversity and closed loop diversity with respect to the despread symbol stream.
A method of operating a wireless communication system, comprising the steps of
- receiving a plurality of symbols into encoder circuitry;
- applying space time block coded open loop diversity and closed loop diversity to the plurality of symbols to form a plurality of signals;
- and
- transmitting the plurality of signals along a plurality of antenna to a receiver;
- wherein the plurality of antennas comprises a plurality of sets of antennas;
- and
- wherein the step of applying space time block coded open loop diversity and closed loop diversity applies space time block coded open loop diversity to selected ones of the plurality of symbols such that signals transmitted by any one antenna in the set of antennas represent open loop diversity with respect to signals transmitted by any other antenna in the set of antennas.
A diversity encoder circuit for a wireless communication system, comprising:
- an input terminal coupled to receive a first symbol and a second symbol, each symbol having plural data bits;
- a first output terminal coupled to a first antenna and arranged to produce a product of a first scalar weight and one of the first symbol and a conjugate of the first symbol at a first time and a product of a second scalar weight and one of the second symbol and negative conjugate of the second symbol at a second time;
- and
- a second output terminal coupled to a second antenna and arranged to produce a product of a third scalar weight and one of the second symbol and negative conjugate of the second symbol at the first time and a product of a fourth scalar weight and one of the first symbol and the conjugate of the first symbol at the second time.
A diversity decoder circuit for a wireless communication system, comprising:
- an input terminal coupled to receive a product of a first scalar weight and one of a first symbol and a conjugate of the first symbol from a first antenna of a remote transmitter and a product of a third scalar weight and one of a second symbol and negative conjugate of the second symbol at a first time from a second antenna of the remote transmitter, wherein the input terminal is coupled to receive a product of a second scalar weight and one of the second symbol and negative conjugate of the second symbol and a product of a fourth scalar weight and one of the first symbol and the conjugate of the first symbol at a second time from the remote transmitter;
- and
- a decoder coupled to the input terminal and producing the first symbol and the second symbol.
A method of diversity encoding a signal for transmission to a remote wireless communication circuit, comprising the steps of:
- producing a first product of a first weight and a first symbol at a first time;
- producing a second product of a second weight and a second symbol at a second time;
- producing a third product of a third weight and a negative conjugate of the second symbol at the first time;
- producing a fourth product of a fourth weight and a conjugate of the first symbol at the second time;
- applying the first and second products to a first antenna;
- and
- applying the third and fourth products to a second antenna, wherein each of the first and second weights is determined in response to a channel effect between the first antenna and the remote wireless communication circuit, and wherein each of the third and fourth weights is determined in response to a channel effect between the second antenna and the remote wireless communication circuit.
A method of diversity decoding a signal from a remote wireless communication circuit, comprising the steps of:
- receiving a first product of a first weight and a first symbol at a first time from a first antenna of the wireless communication circuit;
- receiving a third product of a third weight and a negative conjugate of a second symbol at the first time from a second antenna of the wireless communication circuit, wherein the first weight is determined in response to a channel effect from the first antenna of the remote wireless communication circuit, and wherein the third weight is determined in response to a channel effect from the second antenna of the remote wireless communication circuit;
- decoding the first and third products;
- and
- producing the first symbol and the second symbol.
A method of diversity encoding a signal for transmission to a remote wireless communication circuit, comprising the steps of:
- receiving a plurality of data symbols including a first symbol and a second symbol, each symbol having plural data bits;
- receiving a plurality of weights from the remote wireless communication circuit;
- producing a first product of a first weight and the first symbol at a first time;
- producing a second product of a second weight and a second symbol at a second time;
- producing a third product of a third weight and a negative conjugate of the second symbol at the first time;
- producing a fourth product of a fourth weight and a conjugate of the first symbol at the second time;
- applying the first and second products to a first antenna;
- and
- applying the third and fourth products to a second antenna.
A method of diversity decoding a signal from a remote wireless communication circuit, comprising the steps of:
- receiving a first product of a first weight and a first symbol at a first time from a first antenna of the remote wireless communication circuit;
- receiving a second product of a second weight and the second symbol at a second time from the first antenna of the remote wireless communication circuit;
- receiving a third product of a third weight and a negative conjugate of a second symbol at the first time from the second antenna of the remote wireless communication circuit;
- receiving a fourth product of a fourth weight and a conjugate of the first symbol at the second time from a second antenna of the remote wireless communication circuit;
- and
- decoding the first and fourth products and producing the first symbol.
Dependencies are inferred from the claim text.