工程科学与技术2018，Vol.50Issue(2)：112-117,6.DOI:10.15961/j.jsuese.201601413
一种改进的块对角化预编码算法
An Improved Block Diagonalization Precoding Algorithm
摘要
Abstract
In order to improve the performance of block diagonalization precoding algorithm,an improved algorithm was proposed for multiuser multiple-input multiple-output (MIMO) downlink systems,which employs QR decomposition based on Givens transforma-tion.In the block diagonalization precoding algorithm,the first half of the precoding matrix is required to solve the problem of multi-user interference,and the latter one to reduce the interference between the antennas of each user.The core algorithm of the first half matrix is orthogonalization algorithm,which will directly affect the bit error rate (BER) performance of the block diagonalization pre-coding algorithm.Therefore,the original orthogonalization algorithm was replaced by QR decomposition algorithm based on Givens transformation.Using this algorithm to solve the first half of the precoding matrix,the orthogonal basis of the interference matrix's zero space can be obtained.By using the Givens transformation,the matrix with better orthogonality can be obtained,so as to further re-duce the BER of the system.The simulation results showed that compared with the traditional block diagonalization algorithms,the complexity of the system was decreased and the BER performance can be improvedgreatly.Compared with the block diagonalization algorithms based on Gram-Schmidt orthogonalization,the BER performance can be improved by 3~5 dB,with a slight increase in the algorithm complexity.关键词
多输入多输出/预编码/块对角化/计算复杂度/误码率Key words
multiple-input multiple-output (MIMO)/precoding/block diagonalization/computational complexity/bit error rate (BER)分类
信息技术与安全科学引用本文复制引用
高明,孙成越,林少兴,王勇..一种改进的块对角化预编码算法[J].工程科学与技术,2018,50(2):112-117,6.基金项目
国家自然科学基金资助项目(61671346) （61671346）
国家"111计划"创新引智基地资助项目(B08038) （B08038）
