Precoding and feedback channel information in wireless communication system
AssigneeGoldpeak Innovations Inc
InventorsJianjun LI, Kyoungmin PARK
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Abstract
The present invention relates to precoding and feedback channel information in wireless communication system. A method includes receiving a first Precoding Matrix Index (PMI) and a second PMI from a terminal; mapping one or two codewords into layers; precoding symbols mapped into the layers using a first precoding matrix derived from the first PMI and a second precoding matrix derived from the second PMI; and transmitting the precoded symbols to the terminal, wherein the reception of the first PMI is less frequent than the reception of the second PMI.
Claims15
A method for transmitting control information of a terminal, the method comprising:
- estimating a downlink channel from a signal received from a base station;
- transmitting a first precoding matrix index (PMI) to the base station;
- transmitting a second PMI to the base station;
- and
- receiving, from the base station, precoded data symbols through an antenna,
- wherein the precoded data symbols are mapped into at least one layers based on a precoding matrix derived from the first PMI and the second PMI.
A mobile terminal, comprising:
- a receiver configured to receive, from the base station, a signal;
- and
- a channel estimator configured to estimate a downlink channel from the received signal;
- wherein the mobile terminal is configured to transmit a first precoding matrix index (PMI) and a second PMI to the base station,
- wherein the receiver is further configured to receive, from the base station, precoded data symbols through an antenna,
- wherein the precoded data symbols are mapped into at least one layers based on a precoding matrix derived from the first PMI and the second PMI.
A method for receiving control information by a base station, the method comprising:
- transmitting a signal for channel estimation to a mobile terminal;
- receiving a first precoding matrix index (PMI) from the mobile terminal;
- receiving a second PMI from the mobile terminal;
- precoding symbols based on a precoding matrix derived from the first PMI and the second PMI;
- mapping the precoded data symbols into at least one layer;
- and
- transmitting, to the mobile terminal, the precoded data symbols through at least one antenna.
Dependencies are inferred from the claim text.