文档介绍：
Research on non-codebook precoding for LTE uplink
Zhu Zhehui, ZHANG Yang'an**
(School of Information Photonics and munications , Beijing University of Posts and
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munications, Beijing 100876)
Abstract: In order to meet the needing of LTE uplink in high speed data rate and high system
capacity,spatial multiplex technology is introduced in the uplink transmission. However, the
interference between users in MIMO system which used spatial multiplex technology will inevitably
affect the system performance to some extent. To ensure the receiving can demodulate each data stream
accurately, pre-coding techniques can be used for processing multiple data this paper ,
pre-coding based on non-codebook is researched, including the basic process,the design of pilot
frequency and the major resistance to achieve non-codebook: antenna calibration. Three solutions are
proposed for this problem, and analysis aimed to measure the performance advantages and
disadvantages of these solutions are thoroughly carried out.
Keywords: LTE; non-codebook; precoding
0 Introduction
The most improvement of Long Term Evolution system is the application of a new air
interface technology. SC-FDMA multiple access technology is used in LTE uplink while
Orthogonal Frequency Division Multiple Access(OFDMA) technology is used in LTE downlink.
SC-FDMA is a single-carrier multiple access method which can allocated bandwidth dynamically
based on OFDM. Compared to use OFDM technology, the system use of SC-FDMA is more
conducive to the saving of the cost and power and the improving of the uplink coverage with
lower PAPR. In order to meet the needing of LTE uplink in High Speed Data Rate and High
system capacity, and take advantage of multiple transmit antennas to improve spectrum efficiency,
spatial multiplex technology is introduced in the uplink transmission.
Spatial multiplex technology makes use of the low correlation of space channel, it