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Multi-user precoding method and system, transmitter and receiver
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A receiver and transmitter technology, applied in the field of multi-user precoding, can solve the problems of small system capacity and poor system performance
Inactive Publication Date: 2011-09-21
NTT DOCOMO INC
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Embodiment 1
[0103]In this embodiment, the receiver normalizes its own channel information and then quantizes to an amplitude-normalized codebook in the codebook set.
[0104] Figure 4 A flow chart of the multi-user precoding method in this embodiment is shown. see Figure 4 , the method includes:
[0105] In step 401, a codebook set including amplitude-normalized codebooks is preset.
[0106] The codebook in this embodiment is an amplitude-normalized constant modulus codebook, that is, the modulus of each codebook is equal to 1. Here the number of rows of the codebook set is equal to the number of transmitting antennas, and the number of columns is equal to 2 N , where N is the number of feedback bits. For example, in an MU system with 4 transmit antennas and 4 feedback bits, the codebook set can be set as C=[C 1 , C 2 ,...C 16 ],in: C 1 = - 0.67762 + ...
Embodiment 2
[0147] In this embodiment, after the receiver determines its own quantized channel information, it also calculates its own CQI and transmits it to the transmitter together with the quantized channel information; for the transmitter, it communicates with the receiver. Obtain the CQI of the receiver.
[0148] Image 6 A flow chart of the multi-user precoding method in this embodiment is shown. see Image 6 , the method includes:
[0149] In step 601, a codebook set including amplitude-normalized codebooks is preset.
[0150] In steps 602-603, after estimating the channel information from the transmitter to the receiver, the receiver normalizes the amplitude component of its own channel information; the receiver selects and normalizes the amplitude component from the codebook set The codebook with the closest channel information is used as the quantized channel information of the receiver.
[0151] The above three steps are the same as the operations of steps 401 to 403 in E...
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Abstract
The invention provides a multi-user precoding method and a system, a transmitter and a receiver. The method comprises the following steps: presetting a codebook set including codebooks with normalized amplitude; normalizing the amplitude component of channel information after the receiver estimates the channel information from the transmitter to the receiver, and selecting a codebook most similar to the normalized channel information from the codebook set as the quantized channel information; and acquiring the quantized channel information of a plurality of receivers, and precoding the downlink data of the plurality of receivers based on the quantized channel information by using the transmitter. The scheme in the invention can effectively enlarge the capacity of a multi-user system.
Description
technical field [0001] The present invention relates to multi-user (MU) precoding, in particular to a multi-user precoding method and system, a transmitter and a receiver. Background technique [0002] The development of multi-antenna technology enables the simultaneous transmission of multiple users. The MU system has many advantages, for example: system capacity can be improved by transmitting multiple user information on the same resource block, multi-user scheduling provides multi-user diversity, and so on. In order to transmit signals of multiple users on the same time, frequency and code domain resources and reduce multi-user co-channel interference (Co-channel Interference), precoding technology has been introduced and has become one of the key technologies in the MU system. [0003] In the codebook-based precoding technology, both the base station and the mobile station can know the preset codebook set with fixed content, and the mobile station as a receiver quantiz...
Claims
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