Method for transmitting an information sequence

摘要

Methods and apparatus are disclosed for applying successive multi-rank beamforming strategies (e.g., successive precoding strategies) for the design of precoders over a set of parallel channels. Successive beamforming is applied to a narrow band channel model and is also applied for finer quantization of a single beamforming vector (e.g., recursive beamforming). A first embodiment provides the optimal approach with high complexity. An alternative embodiment provides successive beamforming for near optimal precoding selection with medium complexity. A low complexity method for precoder selection is also provided wherein a channel representative matrix for the set of parallel channels is determined and successive beamforming on the calculated channel representative is applied.

主权项

1. A base station used for a multiple input multiple output (MIMO) wireless communications system configured to have a plurality of layers, the base station comprising:
a control unit to encode a single codeword over all of the plurality of layers in case of single codeword transmission and to encode each of multiple codewords over one or more of the plurality of layers in case of multiple codeword transmission; a transmission unit to transmit, in the MIMO wireless communications system, data simultaneously in the plurality of layers to a user equipment; and a receiving unit to receive a single channel quality index (CQI) from the user equipment as a feedback for the plurality of layers, wherein each of the plurality of layers comprises a transmission sequence corresponding to a column of a precoder.