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US 2013/0094344 A1Published application
Cdd precoding for open loop su mimo
AssigneeSamsung Electronics Co., Ltd.
InventorsJianzhong Zhang, Cornelius Van Rensburg
Life of this patent
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Abstract
A method for data transmission, comprises the steps of modulating data to be transmitted via a transmitter into a plurality of modulated symbols, generating a codebook comprising a plurality of codewords, selecting a codeword from the codebook as a precoding matrix by a predetermined cycling selection, precoding the modulated symbols with the precoding matrix selected, and transmitting the precoded modulated symbols.
Claims37
-44. (canceled)
A method for transmitting in a communication system, the method comprising:
- scrambling a plurality of bits to be transmitted in one subframe;
- modulating the plurality of scrambled bits to generate a plurality of modulation symbols;
- generating precoded symbols y(i) by
- y(i)=W(i)·D(i)·U,
- where W(i) is of size P×v,
- D(i) is of size v×v and is a diagonal matrix for support of large cyclic delay diversity,
- U is of size v×v,
- P is a number of antenna ports, and
- v is a number of layers, and
- wherein W(i) can be cyclically selected in a subset of a codebook based on the number of layers v.
7 more elements
An apparatus for transmitting in a communication system, the apparatus comprising:
- means for scrambling a plurality of bits to be transmitted in one subframe;
- means for modulating the plurality of scrambled bits to generate a plurality of modulation symbols;
- means for generating precoded symbols y(i) by
- y(i)=W(i)·D(i)·U,
- where W(i) is of size P×v,
- D(i) is of size v×v and is a diagonal matrix for support of large cyclic delay diversity,
- U is of size v×v,
- P is a number of antenna ports, and
- v is a number of layers, and
- wherein W(i) can be cyclically selected in a subset of a codebook based on the number of layers v.
7 more elements
A method for receiving in a communication system, the method comprising:
- restoring precoded symbols y(i) included in one received subframe, the precoded symbols y(i) being generated by
- y(i)=W(i)·D(i)·U,
- where W(i) is of size P×v,
- D(i) is of size v×v and is a diagonal matrix for support of large cyclic delay diversity,
- U is of size v×v,
- P is a number of antenna ports, and
- v is a number of layers, and
- wherein W(i) can be cyclically selected in a subset of a codebook based on the number of layers v y(i)=W(i)·D(i)·U;
- demodulating the precoded symbols to generate a plurality of scrambled bits;
- and
- descrambling the plurality of scrambled bits into a plurality of bits included in the one received subframe.
8 more elements
An apparatus for receiving in a communication system, the apparatus comprising:
- means for restoring precoded symbols y(i) included in one received subframe, the precoded symbols y(i) being generated by
- y(i)=W(i)·D(i)·U,
- where W(i) is of size P×v,
- D(i) is of size v×v and is a diagonal matrix for support of large cyclic delay diversity,
- U is of size v×v,
- P is a number of antenna ports, and
- v is a number of layers, and
- wherein W(i) can be cyclically selected in a subset of a codebook based on the number of layers v y(i)=W(i)·D(i)·U;
- means for demodulating the precoded symbols to generate a plurality of scrambled bits;
- and
- means for descrambling the plurality of scrambled bits into a plurality of bits included in the one received subframe.
8 more elements
A method for data transmission, comprising:
- selecting, at the precoder, a codeword from a predetermined codebook based on a transmission rank by cycling through a selection of each of a subset of the codewords in the codebook, wherein each codeword in the subset is selected consecutively for a specified number of times corresponding to the transmission rank;
- generating, at the precoder, a precoding matrix based on the selected codeword;
- precoding, at the precoder, a plurality of symbols with the precoding matrix;
- and
- transmitting, at an RF amplifier enabling transmission stage, the plurality of precoded symbols.
2 more elements
A transmitter for transmitting data, comprising:
- a modulator configured to modulate data to be transmitted via the transmitter into a plurality of modulated symbols;
- a precoder configured to select a codeword from a subset of codewords in a predetermined codebook based on a transmission rank, generate a precoding matrix based on the selected codeword, and precode the modulated symbols with the precoding matrix;
- and
- an RF amplifier configured to enable transmission of the precoded modulated symbols.
1 more element
A method of data transmission, comprising:
- selecting, at a precoder of a transmitter, a codeword from a predetermined codebook based on a transmission rank by cycling through a selection of each of a subset of the codewords in the codebook, wherein each codeword in the subset is selected consecutively for a specified number of times corresponding to the transmission rank;
- generating, at the precoder, a precoding matrix based on the selected codeword and based on a feedback signal without a precoding matrix index (PMI) transmitted from an uplink for a given User Equipment;
- precoding, at the precoder, a plurality of symbols with the precoding matrix;
- and
- transmitting, at an RF amplifier enabling transmission stage of the transmitter, the precoded symbols.
2 more elements
Dependencies are inferred from the claim text.