Precoding method and apparatus

A transmitting end in a distributed communications system, the transmitting end comprising:

• a multiplier calculating unit, configured to construct a Lagrange function according to a precoding matrix, transmit power, a receive filter matrix and a weighting matrix, and obtain a Lagrange multiplier by using the Lagrange function;
• an iterative multiplier unit, configured to update the precoding matrix according to the Lagrange multiplier to obtain an iterative precoding matrix and an iterative receive filter matrix;
• an iterative precoding matrix unit, configured to obtain an iterative Lagrange multiplier according to the iterative precoding matrix, the transmit power, the iterative receive filter matrix and the weighting matrix, and repeat the above steps in an iterative manner of updating the iterative precoding matrix according to the iterative Lagrange multiplier until the iterative precoding matrix converges to a threshold;
• a precoding unit, configured to precode information to be transmitted according to the iterative precoding matrix converging to the threshold;
• and
• wherein in the multiplier calculating unit, the weighting matrix is obtained by calculation using the following formula:
• W
• k
• =
• 1
• ln
• ⁢
• ⁢
• 2
• ⁢
• ω
• k
• ⁢
• E
• k
• -
• 1
• ,
• wherein Wk indicates a weighting matrix associated with a Kth user, ωw indicates a weighting variable of the kth user, and Ek−1 indicates an inverse matrix of an error matrix of the kth user.

A non-transitory computer medium comprising a computer program that, when executed by hardware, performs a precoding method comprising:

• constructing a Lagrange function according to a precoding matrix, transmit power, a receive filter matrix and a weighting matrix, and obtaining a Lagrange multiplier by using the Lagrange function;
• updating the precoding matrix according to the Lagrange multiplier to obtain an iterative precoding matrix and an iterative receive filter matrix;
• obtaining an iterative Lagrange multiplier according to the iterative precoding matrix, the transmit power, the iterative receive filter matrix and the weighting matrix, and repeating the above steps in an iterative manner of updating the iterative precoding matrix according to the iterative Lagrange multiplier until the iterative precoding matrix converges to a threshold;
• precoding information to be transmitted according to the iterative precoding matrix converging to the threshold;
• and
• wherein the weighting matrix is obtained by using the following formula:
• W
• k
• =
• 1
• ln
• ⁢
• ⁢
• 2
• ⁢
• ω
• k
• ⁢
• E
• k
• -
• 1
• ,
• wherein Wk indicates a weighting matrix associated with a Kth user, ωk indicates a weighting variable of the kth user, and Ek−1 indicates an inverse matrix of an error matrix of the kth user.