System and method for wireless communications
AssigneeFuturewei Technologies, Inc.
InventorYang Tang
Life of this patent
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Abstract
A system and method for wireless communications is provided. A method for operating in a communications network includes receiving a codebook, the codebook includes a plurality of codewords, and determining if the codebook satisfies a constant modulus property. The method also includes in response to determining that the codebook does not satisfy the constant modulus property, converting the codebook into a codebook satisfying the constant modulus property, and storing the codebook satisfying the constant modulus property. The method further includes storing the codebook in response to determining that the codebook does satisfy the constant modulus property, and causing to transmit a transmission to a communications device, wherein the transmission is encoded using a codeword in the stored codebook.
Claims19
A method for operating in a communications network, the method comprising:
- receiving a codebook, the codebook comprising a plurality of codewords;
- determining if the codebook satisfies a constant modulus property, comprising
- determining that the codebook satisfies the constant modulus property if
-
- c
- i
- ,
- j
-
- 2
- =
- 1
- N
- t
- for all i and j, where ci,j is an i-th element of a j-th codeword in the codebook, |ci,j| returns the magnitude of codeword ci,j, and Nt is a number of transmit antenna in the communications network, and
- determining that the codeword does not satisfy the constant modulus property if
-
- c
- i
- ,
- j
-
- 2
- ≠
- 1
- N
- t
- for any codeword in the codebook;
- if the codebook does not satisfy the constant modulus property,
- converting the codebook into a codebook satisfying the constant modulus property, and
- storing the codebook satisfying the constant modulus property;
- if the codebook does satisfy the constant modulus property, storing the codebook;
- and
- causing to transmit a transmission to a communications device, wherein the transmission is encoded using a codeword in the stored codebook.
A method for communications device operation in a communications network, the communications network having a base station, the method comprising:
- computing an estimate of a communications channel between the communications device and the base station;
- quantizing the estimate with a first codebook, wherein the first codebook satisfies a constant modulus property wherein
-
- c
- i
- ,
- j
-
- 2
- =
- 1
- N
- t
- for all i and j, where ci,j is an i-th element of a j-th codeword in the codebook, |ci,j| returns the magnitude of codeword ci,j and Nt is a number of transmit antenna in the communications network;
- and
- transmitting information based on the quantized estimate to the base station.
A method for base station operation in a communications network, the base station serving a communications node, the method comprising:
- receiving channel information from the communications node;
- extracting a codebook index from the channel information;
- reconstructing a channel estimate using the codebook index and a codebook, wherein the codebook satisfies a constant modulus property wherein
-
- c
- i
- ,
- j
-
- 2
- =
- 1
- N
- t
- for all i and j, where ci,j is an i-th element of a j-th codeword in the codebook, |ci,j| returns the magnitude of codeword ci,j, and Nt is a number of transmit antenna in the communications network;
- and
- causing to transmit a transmission to the communications node, wherein the transmission is precoded using the reconstructed channel estimate.
Dependencies are inferred from the claim text.