Method for transmitting channel quality information in a multiple input multiple output system

摘要

A method is provided for transmitting channel quality information (CQI) in a MIMO system. A method for allowing a receiver to feed back a CQI value to a transmitter in a Multiple Input Multiple Output (MIMO) system includes receiving a transmission (Tx) pilot signal for each Tx antenna from a base station (BS), measuring a first CQI value of a first codeword and a second CQI value of a second codeword on the basis of the pilot signal, and transmitting the first CQI value of the first codeword and the second CQI value of the second codeword to the base station (BS), wherein at least one of the first and second CQI values includes specific information capable of indicating a transmission restriction status of a corresponding codeword.

主权项

1. A method for a user equipment in a Multiple Input Multiple Output (MIMO) system, the method comprising:
transmitting, by the user equipment, rank information at a first transmission period; and transmitting, by the user equipment, first channel quality information (CQI) for a first codeword and a differential value at a second transmission period, the differential value indicating a difference between the first CQI and a second CQI for a second codeword, wherein the first transmission period is longer than the second transmission period, wherein at least the first CQI or the second CQI is set to an index value of a plurality of index values to indicate a transmission restriction status for the corresponding first or second codeword when a channel quality for the corresponding first or second codeword is equal to or less than a reference value, and wherein each of the plurality of index values is mapped to a coding rate and a modulation order.