User scheduling method in multiple antenna system
AssigneeLG Electronics Inc.
InventorsBin Chul Ihm, Intae Hwang, Cheolwoo Yoo, Wook Bong Lee
Life of this patent
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Abstract
A user scheduling method includes: determining a maximum temporary user set of a maximum capacity among temporary user sets obtained from combinations of M number of active users; and transmitting data to users belonging to the maximum temporary user set via multiple antennas by using a preceding matrix and a weight matrix with respect to the maximum temporary user set. Users to actually receive data can be selected from among active users in a multi-antenna system, and a corresponding precoding matrix and a weighting matrix can be obtained.
Claims9
A user scheduling method comprising:
- selecting temporary user sets from M number of active users;
- determining a proportional factor set which is applied to a SINR (signal-to-interference plus noise ratio) of each user included in a first temporary user set among the temporary user sets;
- determining a weight matrix making the SINR of each user multiplied by a proportional factor being constant when the determined proportional factor set is applied to the SINR of the each user included in the first temporary user set;
- calculating capacity of the first temporary user set when the weight matrix is applied;
- determining the first temporary user set as a maximum temporary user set when the first temporary user set has a maximum capacity among the temporary user sets;
- and
- transmitting data to users belonging to the maximum temporary user set via multiple antennas by using a precoding matrix and a weight matrix with respect to the maximum temporary user set.
A transmitter comprising:
- a plurality of transmit antennas;
- a scheduler;
- a channel encoder that performs channel encoding on the data streams;
- a mapper that maps the channel-coded data to data symbols on a signal constellation;
- a signal processor that performs signal processing on the data symbols to generate signal-processed symbols;
- a power allocation unit that allocates power to the signal-processed symbols through a weight matrix with respect to the maximum temporary user set;
- and
- a precoder that performs precoding on the power-allocated symbols through a precoding matrix with respect to the maximum temporary user set to generate transmit signals transmitted via the plurality of transmit antennas,
- wherein the scheduler is configured for:
- selecting temporary user sets from M number of active users;
- determining a proportional factor set which is applied to a SINR (signal-to-interference plus noise ratio) of each user included in a first temporary user set among the temporary user sets;
- determining a weight matrix making the SINR of each user multiplied by a proportional factor being constant when the determined proportional factor set is applied to the SINR of the each user included in the first temporary user set;
- calculating capacity of the first temporary user set when the weight matrix is applied;
- determining the first temporary user set as a maximum temporary user set when the first temporary user set has a maximum capacity among the temporary user sets;
- and
- outputting a plurality of data streams with respect to the maximum temporary user set.
Dependencies are inferred from the claim text.