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摘要在现代无线通信系统中, 由于存在着路径损耗、阴影效应等大尺度衰落，引入中继协作技术具有重要的意义，它能够显著提升信息传输可靠性能，实现用户之间的高速信息交换。同单向中继相比，双向中继可以在两个时隙内完成用户之间的数据交换，频谱效率可以提高一倍。本文针对单用户对和多用户两种双向中继系统模型展开研究。主要包括以下几个方面：(1)研究了单用户对双向中继系统三种典型的波束成形算法， 即迫零 （Zero-forcing，ZF） 算法， 最小均方误差 （Minimum mean square error， MMSE） 算法， 广义幂迭代 （Generalpower iterative，GPI）算法，仿真结果表明：给定理想的信道估计条件下，三种算法的和速率性能优劣顺序为：GPI>MMSE>ZF；在此基础上分析了信道估计误差对双向中继系统性能的影响，发现当信道估计误差系数大于 0.1 时，系统和速率及误码率出现严重恶化。(2)研究了多用户对双向中继系统三种波束成形算法， 即SVD plus SVD算法 ，BDplus BD 算法，ZF plus ZF 算法， 同时为前两种算法引入注水功率分配。 仿真结果表明：三种算法的和速率性能优劣为：SVD plus SVD > BD plus BD > ZF plus ZF；同等功率分配相比，注水功率分配的 SVD plus SVD 和 BD plus BD 算法误码性能有 4dB 左右的提高。
- 上一篇：多天线无线通信系统的先进检测算法研究
- 下一篇：对于全息应用中光引发机制的深层次探究
毕业论文关键词 双向中继, 单用户对, 多用户对, 最大和速率, 信道估计误差, 块对角化,奇异值分解, 注水功率分配22282
Title Research on interference management for multi-user two-way relay
cooperative wireless networks
Abstract
In modern wireless communication systems, due to large-scale fading caused
by path loss, shadowing or other reasons, the introduction of relay
technology to wireless systems has important value. Cooperative relaying
can significantly improve the reliability of information transmission and
achieve a high-speed information exchange between users. Compared to
one-way relay , a two-way relay can complete data interchange between user
pairs within two slots, so that the spectrum efficiency can be doubled.
Both single-user and multi-user two-way relay system model are
investigated in this paper. Our research tasks include the following
aspects:
(1) We make an investigation of three typical beamforming algorithms
for single-user two-way relay system including zero-forcing (ZF)
algorithm, minimum mean square error (MMSE) algorithm, General power
iterative (GPI) algorithm. Simulation results show that: given ideal
channel state information, the three algorithms are decreasing order in
sum-rate as follows: GPI>MMSE>ZF; in addition, the impact of estimation
errors on the performance of two-way relay system is analyzed, we find :
if the error coefficient of channel estimation is greater than 0.1, the
sum rate and error rate of the system degrades seriously.
(2)Three beamforming algorithms for multi-user two-way relay system
namely: SVD plus SVD , BD plus BD , and ZF plus ZF, are researched, and
water filling power allocation is designed for the first two algorithms.
Simulation results show that: the performances of the three algorithms
follow decreasing order : SVD plus SVD>BD plus BD>ZF plus ZF; Compared toequal power allocation, WFPA can improve the BER performances of SVD plus
SVD and BD plus BD by 4 dB.
Keywords two-way relay, single-user, multi-user, maximizing sum-rate,
channel estimation error, block diagonalization, singular value
decomposition, water filling power allocation目 次
1 绪论.1
1.1 无线双向中继研究背景1
1.2 无线双向中继研究现状2
1.3 论文结构2
2.双向中继系统4
2.1 双向中继系统的发展4
2.2 基于放大重传策略的双向中继系统典型参数6
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