Signal generation using phase-shift based pre-coding
AssigneeLG Electronics Inc.
InventorsMoon-Il Lee, Bin-Chul Ihm, Jin-Young Chun, Jae-Won Chang, Jin-Hyuk Jung
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Abstract
A phase-shift based pre-coding scheme used in a transmitting side and a receiving side that has less complexity than those of a space-time coding scheme, that can support various spatial multiplexing rates while maintaining the advantages of the phase-shift diversity scheme, that has less channel sensitivity than that of the pre-coding scheme, and that only requires a low capacity codebook is provided.
Claims27
A method for transmitting a signal by a transmitter via Nt antennas in a multiple antenna system using multiple subcarriers, the method comprising:
- acquiring a plurality of modulation symbol streams by modulating a transmission signal;
- phase-shift based precoding the plurality of modulation symbol streams using a matrix of D*U to output Nt symbol streams;
- and
- transmitting the ‘Nt’ symbol streams via the Nt antennas,
- wherein D is a diagonal matrix and U is a unitary matrix,
- wherein U and D are determined such that the plurality of modulation symbol streams are cyclically delayed with a unit of a first delay value when feedback information from a receiver is not used,
- wherein U and D are determined such that the plurality of modulation symbol streams are cyclically delayed with a unit of a second delay value, when the feedback information from the receiver is used, and
- wherein the first delay value is larger than the second delay value.
A method for receiving a signal by a receiver in a multiple antenna system using multiple subcarriers, the method comprising:
- receiving the signal transmitted from a transmitter via Nt antennas;
- performing a function that is opposite to a phase-shift based precoding on the received signal using a matrix of D*U;
- and
- demodulating the signal on which the opposite function was performed,
- wherein D is a diagonal matrix and U is a unitary matrix,
- wherein U and D are the same matrices determined at the transmitter such that a plurality of modulation symbol streams are cyclically delayed with a unit of a first delay value, when feedback information from the receiver is not used,
- wherein U and D are the same matrices determined at the transmitter such that the plurality of modulation symbol streams are cyclically delayed with a unit of a second delay value, when the feedback information from the receiver is used, and
- wherein the first delay value is larger than the second delay value.
An apparatus for transmitting a signal via Nt antennas in a multiple antenna system using multiple subcarriers, the apparatus comprising:
- a mapper acquiring a plurality of modulation symbol streams by modulating a transmission signal;
- and
- a precoder performing a phase-shift based precoding on the plurality of modulation symbol streams using a matrix of D*U to output Nt symbol streams,
- wherein D is a diagonal matrix and U is a unitary matrix,
- wherein U and D are determined such that the plurality of modulation symbol streams are cyclically delayed with a unit of a first delay value when feedback information from a receiver is not used,
- wherein U and D are determined such that the plurality of modulation symbol streams are cyclically delayed with a unit of a second delay value, when the feedback information from the receiver is used, and
- wherein the first delay value is larger than the second delay value.
An apparatus for receiving a signal in a multiple antenna system using multiple subcarriers, the apparatus comprising:
- one or more antennas for receiving the signal transmitted from a transmitter via Nt antennas;
- a precoder performing a function that is opposite to a phase-shift based precoding on the received signal using a matrix of D*U;
- and
- a demapper demodulating the signal on which the opposite function was performed,
- wherein D is a diagonal matrix and U is a unitary matrix,
- wherein U and D are the same matrices determined at the transmitter such that a plurality of modulation symbol streams are cyclically delayed with a unit of a first delay value, when feedback information from the apparatus is not used,
- wherein U and D are the same matrices determined at the transmitter such that the plurality of modulation symbol streams are cyclically delayed with a unit of a second delay value, when the feedback information from the apparatus is used, and
- wherein the first delay value is larger than the second delay value.
Dependencies are inferred from the claim text.