499 results about "Channel state information feedback" patented technology

Certain embodiments of the invention may be found in a method and system for an improved user group selection scheme with finite-rate channel state information feedback for frequency division duplex (FDD) multiuser multiple-input-multiple-output (MIMO) downlink transmission. Aspects of the method may include selecting, from a plurality of users in a FDD multiuser communication system, a first user having a channel gain that is greater than a channel gain corresponding to a remaining portion of the plurality of users. A second user may be selected from the remaining portion of the plurality of users, based on a channel gain of the second user and orthogonality of the second user's channel direction with respect to the first user. The selected second user may have a channel gain that is greater than a channel gain corresponding to the remaining portion of the plurality of users.

Aspects of a greedy search user group selection scheme with range reduction for FDD multiuser MIMO downlink transmission with finite-rate channel state information feedback are provided. The method may comprise receiving feedback information via a communication channel for a plurality of users in a frequency division duplex system. The system capacity may be maximized using the feedback information based on a signal from a single user within a reduced search range or based on the signal from the single user and at least one other signal from another user within a remaining portion of the search range. The feedback information may comprise quantized gain and / or direction of the channel state information of the users.

The invention discloses a channel state information feedback allocation method. The channel state information feedback allocation method includes the following steps that multiple sets of channel state information processes are allocated for a terminal and each channel state information process at least comprises information on a channel measurement portion and information on a disturbance measurement portion. The information on each channel measurement portion comprises a set or multiple sets of non-zero-power channel state information reference signal allocation information or indication information. The information on each disturbance measurement portion comprises at least one of the following information which includes one set or multiple sets of disturbance measurement resource allocation information or the indication information and one set or multiple sets of non-zero-power channel state information reference signal allocation information used for disturbance measurement compensation. The invention meanwhile discloses a measuring and feedback method based on the channel state information feedback allocation method and a corresponding device used for achieving the method. Uniform feedback allocation and reception can be achieved by a base station side and a terminal side in terms of channel state information feedback and flexible channel state information allocation and feedback can be achieved.

The invention discloses a channel state information feedback method and a terminal. The method comprises the following steps: the terminal acquires channel state information, wherein the channel state information comprises channel quality indicator (CQI) information, pre-coding matrix indicator (PMI) information and rank indicator (RI) information; in an eight-antenna system, the PMI comprises a first kind of pre-coding matrix indicators (PMI1) and a second kind of pre-coding matrix indicators (PMI2); in a four-antenna system, the PMI comprises single PMI; and the terminal feeds back the channel state information on a physical uplink shared channel (PUSCH) according to the preset feedback method. The invention improves the performance of a communication system.