目的提高无线宽带下行传输中分层空时编码的性能。
Aim To improve the performance of layered space-time coding (LSTC) for wideband downlink transmission.
空时编码技术通过空间和时间分集接收能有效增加信道容量。
Space -time coding can increase channel capacity by using the space and time diversity technique.
近年来，空时编码作为一种发送分集技术已引起人们广泛的关注。
In recent years space-time coding has attracted wide attention as a transmit diversity technology.
研究了三种主要的空时编码技术设计思想与编译码算法及其性能。
The main three space-time code schemes, including its design thought and encoding and decoding algorithms are studied.
本文所做的工作为硬件实现具有实用价值的空时编码提供了理论基础。
The work of this paper lays a theory foundation for future practical space time code hardware implement.
空时编码是最近提出的使用多个天线应用于瑞利衰落信道的编码技术。
Space- time block codes are code technologies which provide a new paradigm for transmitting over Rayleigh fading channels using multiple antennas.
主要研究了空时编码系统在相关瑞利衰落信道和高斯噪声环境下的性能。
The performance of space-time channel coding scheme is discussed under a Rayleigh fading channel with spatially correlated fading amplitudes and an additive white Gaussian noise.
在现有的各种协作分集协议中，分布式空时编码是最有代表性的协作协议。
In all the cooperative diversity protocols, Distributed SpaceTime Coding (DSTC) is the most representative.
采用空时编码的发射分集系统的性能分析是当前移动通信研究领域的热点问题。
The performance analysis of the transmitted diversity system that adopts space-time code is a hot spot in research cycle.
运用功率分配和空时编码技术可以在MIMO系统中提高频谱效率、改善系统性能。
Power Allocation(PA) and Space Time Codes(STC) are the key techniques of the Multiple-Input Multiple-Output(MIMO) to increase spectral efficiency and improve performance.
论文在第一章对MIMO系统和空时编码技术坐了概述，并且分析了无线信道的特性。
Chapter 1 reviews MIMO system and space-time coding, besides some analysis on wireless channel characteristics.
这些编码是四次群最大似然可译分布空时编码，并且功率在中继之间随时间均匀分布。
These codes are four-group ML decodable and have uniform distribution of power among the relays as well as in time.
首先综述了现有的三大类协作协议，分别为基本协作协议、空时编码协作协议以及编码协作协议。
Specifically, three kinds of cooperation protocols are outlined, including basic cooperation strategies, space-time-coded cooperation protocols and coded cooperation.
作为MIMO核心技术之一的空时编码技术，在MIMO -OFDM系统中具有极为重要的地位。
Being one of the core MIMO techniques, the space-time code technique takes a very important status in the MIMO-OFDM system.
仿真结果表明，将空时编码技术与M IMO-OFDM技术相结合能有效地抵抗频率选择性随机衰落。
The results of simulation show that space-time block code based on MIMO-OFDM is a highly effective technique against the frequency-selective random fading.
空时编码包括三种：空时网格编码(STTC)、空时分层编码(LST)和空时分组编码(STBC)。
Space-time coding includes space-time trellis coding (STTC), layered space-time coding (LSTC) and space-time block coding (STBC).
对OFDM系统提出将空时编码与自适应功率控制技术相结合，给出了仿真结果，提高了分集增益和自适应增益。
For the OFDM system, a scheme of combining space-time code with the adaptive power control technology is proposed with simulation results, which increases the diversity gain and the adaptive gain.
针对分层空时编码技术缺少编码增益的问题，提出了将复数旋转码与分层空时编码技术相结合来提高系统的性能。
It presents a new scheme of combining complex-rotary codes and layered space-time code to improve the performance of systems based on the lack of encoding plus of layered space-time code.
空时编码采用多发送天线设计信道编码，联合考虑分集、编码与调制，从而提高信号在无线衰落信道中传输的可靠性。
The design of channel codes for improving the reliability of communications over fading channel using multiple transmit antennas is considered.
首先，由于空时编码是利用时间和空间的结合，属于空时处理技术，本文对空时信道模型和空时信号处理作了系统的分析。
Firstly, the paper analyses the space-time channel model and space-time signal systematically, as space-time codes belong to the technology dealing with space and time.
针对多输入多输出系统中现有的线性分散(LD)空时码编、解码复杂度高的问题，提出了一类正交线性分散(old)空时编码。
Focusing on the problem that existing linear dispersion (LD) space-time codes have a high encoding and decoding complexity, a type of orthogonal linear dispersion (OLD) space-time codes is proposed.
本文将信号处理中的子空间方法同分层空时码的编码结构相结合，提出了一种垂直分层空时编码，实现了无需训练序列的信道估计。
In this paper, by combining the subspace method with layered space-time codes, we propose a vertical layered space-time code and accomplish the channel estimation without the training symbols.
针对WCDMA下行链路空时编码发送分集(STTD)确定了基于最大比合并(mrc)的分集接收方案，并对其进行了性能分析。
According to space time block coding based transmitting antenna diversity (STTD) in the WCDMA system, this paper presents a reception scheme based on maximal ratio combining (MRC).
利用分组干扰抑制的方法，通过合理地设计空时码的发射码矩阵和对阵列天线进行了子阵划分，提出了一种新的混合型的空时编码方法。
A new hybrid space-time coding approach is presented in this paper. The properly designed code matrix and group interference suppression method are used in this approach.
主要介绍了发射分集技术中用于抗信道衰落和提高系统容量的空时分组码和分层空时码的原理和基本特点，并对这些空时编码技术进行了性能分析。
To overcome the bad performance in combating fading of BLAST and low code rate of STBC, a layered structure STBC is introduced in this article by combining BLAST and STBC.
主要介绍了发射分集技术中用于抗信道衰落和提高系统容量的空时分组码和分层空时码的原理和基本特点，并对这些空时编码技术进行了性能分析。
To overcome the bad performance in combating fading of BLAST and low code rate of STBC, a layered structure STBC is introduced in this article by combining BLAST and STBC.
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