Apparatus and method for overhead reduction of feedback in closed loop MIMO system
AssigneeSamsung Electronics Co., Ltd.
InventorsShuangfeng Han, Zhen Wang, Ho-Kyu Choi, Cheng Shan
Life of this patent
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Abstract
A method and apparatus reduce overhead of feedback in a closed loop Multiple Input Multiple Output (MIMO) system. A controller feeds back the long-term Precoder Matrix Index (PMI) to a serving base station under direction of the serving base station when the long term PMI feedback transmission is required, generates a new codebook using the long term PMI, and determines a short term PMI from the new codebook. A feedback transmitter feeds back the short-term PMI to the serving base station.
Claims26
A feedback method of a terminal in a Multiple Input Multiple Output (MIMO) wireless communication system, comprising:
- feeding back, by a controller, a long term Precoder Matrix Index (PMI) to a serving base station under direction of the serving base station when the long term PMI feedback transmission is required;
- generating, by the controller, a new codebook using the long term PMI;
- determining, by the controller, a short term PMI from the new codebook;
- and
- feeding back, by a feedback transmitter, the short term PMI to the serving base station.
An operating method of a base station in a Multiple Input Multiple Output (MIMO) wireless communication system, comprising:
- sending, by a transmitter, a reference signal to a terminal;
- receiving, by a controller, a long term Precoder Matrix Index (PMI) from the terminal;
- generating, by the controller, a new codebook using the long term PMI;
- and
- receiving, by the controller, from the terminal a short term PMI from the new codebook.
An apparatus of a terminal for feedback in a Multiple Input Multiple Output (MIMO) wireless communication system, comprising:
- a controller configured to feed back a long term Precoder Matrix Index (PMI) to a serving base station under direction of the serving base station when long term PMI feedback transmission is required, generate a new codebook using the long term PMI, and determine a short term PMI from the new codebook;
- and
- a feedback transmitter configured to feed back the short term PMI to the serving base station.
An apparatus of a base station in a Multiple Input Multiple Output (MIMO) wireless communication system, comprising:
- a transmitter configured to send a reference signal to a terminal;
- and
- a controller configured to receive a long term Precoder Matrix Index (PMI) from the terminal, generate a new codebook using the long term PMI, and receive from the terminal a short term PMI from the new codebook.
Dependencies are inferred from the claim text.