SDMA

To some extent , this kind of algorithms can realize SDMA and thus have better performance .

这可以说在一定程度上实现了空分多址的思想，因此在实际应用中也会有更好的效果。

Performance analysis of an improved SDMA technique based on CDMA

一种基于码分多址的改进性空分多址性能分析

This method may use in the SDMA and cell location system .

此方法对蜂窝定位，空分多址系统的实现也有实用价值。

Per column quantization of channel matrix for SDMA systems with limited feedback

有限反馈SDMA系统中信道矩阵的逐列量化算法

Multiuser MIMO SDMA System Based on Convex Optimization

基于凸优化理论的多用户MIMOSDMA系统

The SDMA technique has great potential to be applied in the future civilian or military mobile communication system .

空分多址技术在未来的民用或军用移动通信系统中具有很大的应用潜力。

Multiuser scheduling based on SDMA codebook for multi-relay MIMO system

多中继MIMO通信系统中基于SDMA码本的多用户调度

A Transmit Preprocessing Technique for Downlink SDMA in Multi-user MIMO Channels

多用户MIMO系统下行链路的空分多址发送预滤波技术研究

Based on SDMA , multi-user beamforming can achieve multi-user diversity gain from the different channel feature .

基于空分多址（SDMA）的多用户波束赋形利用用户间的不同信道特性取得多用户分集增益。

Realizing SDMA in GPRS at Mobile Network

在GPRS系统中网络实现SDMA

Methods From 1988 to 2003 , 139 SDMA flaps were transferred for hand injuries .

方法1998年～2003年，对139例手部皮肤或伴有肌腱缺损的患者，采用不同类型的SDMA皮瓣或带食指伸肌腱的肌腱皮瓣移植进行修复。其中男97例，女42例。

The main operations in SDMA include uplink beamforming and downlink beamforming .

空分多址主要包括上行波束成形也包括下行波束成形，上行波束成形由上行链路波束权值生成与上行链路接收信号的分解组成；

Partial Random Opportunistic SDMA with Beam Selection

基于部分随机波束选择的机会式空分多址技术

Then the downlink SINR distribution of orthogonal beam-forming SDMA systems is derived .

同时得到了正交波束成形空分多址系统中下行信号-干扰比的分布。

With the simplified OFDM / SDMA system model and some assumptions of the physical layer , two scheduling schemes were proposed .

在简化的OFDM/SDMA系统模型下和一些物理层假设下，提出了两个启发式的调度算法。

Cross-Layer Design in Multiuser MIMO SDMA Systems

多用户MIMOSDMA系统中的跨层设计

Fast PDA Multiuser-Detection Algorithm in SDMA System

空分多址系统中的快速PDA算法

Result : There were 4 the dorsal metacarpal arteries . ② The SDMA existed with a high rate ;

结果掌背动脉共有4条。（2）第二掌背动脉出现率高；

SINR-Based Antenna Combining for Limited Feedback SDMA

有限反馈SDMA中基于信干噪比的天线合并算法

Objective To provide the anatomic bases for clinical application of the second dorsal metacarpal artery ( SDMA ) island flap with double pivot points .

目的为第2掌背动脉（seconddorsalmetacarpalartery，SDMA）双轴点岛状皮瓣的临床应用提供解剖学依据，并观察其效果。

This paper analyzed the performance of the uplink of space-time coded OFDM / SDMA systems assuming each user is equipped with two transmit antennas .

分析了每用户双发送天线的空时编码OFDM/SDMA系统上行链路的性能。

On the other hand , utilizing the smart antenna and the users ' spatial information , we can develop the Space Division Multiple Access ( SDMA ) technology .

另一方面，利用智能天线和用户空间位置信息可以实现空分多址（SDMA）接入技术。

A multiuser MIMO SDMA joint Tx-Rx optimization system is proposed based on the convex optimization theory , and each user 's BER is taken as the objective function .

提出了一种基于凸优化理论的多用户MIMOSDMA联合发送&接收优化系统。

Thus , the dissertation chiefly deals with the location information and multiplex access technology , especially with the novel SDMA ( space division multiplex access ) technology applied to the rural .

本论文主要讨论个人通信系统中的位置信息和多址技术，特别是空分多址技术。

In the paper , we presents the concept , implementation scheme and working link of SDMA , especially focus on the inprovement of capacity and service blocking probability then achieved SDMA .

文中给出了SDMA的概念，实现方案及工作链路，重点讨论了实现SDMA后，系统容量及业务阻塞率的改善情况。

The future application of SDMA to 3G network construction is prospected in the circumstance that 3G trial network test has been completed and the commercial network will be constructed on large scale in China .

并在我国目前3G移动通信网络完成实验网测试，即将展开大规模商用网建设的大环境下，分析了空分多址在3G网络建设中的应用前景。

Base on the distribution , a feedback-control scheme for SDMA systems is proposed . The scheme sets thresholds both for quantization error and channel gain to implement the precise control of feedback .

并在此基础上提出了空分多址系统基于有限反馈限制的方法，根据下行信号-干扰比的分布设置信道矢量量化误差阈值、信道增益阈值，实现了信道状态信息反馈的精确控制。

In the past decade , techniques for MIMO system , such as space-time coding , spatial multiplexing , and space division multiple access ( SDMA ), have received extensive research and made significant progress .

近十年来，针对MIMO系统的通信技术，如空时编码、空间复用和空分多址，成为无线通信领域的研究热点并取得很多进展。

Beamforming comes from smart antenna with strengthening desired signal and suppressing inter-users interference as its typical technical superiority . It is also the base to realize SDMA ( Space Division Multiple Access ) .

波束形成技术源于智能天线、增强期望、抑制用户干扰是其典型的技术优势，也是SDMA（Spacedivisionmultipleaccess）能够得以实现的基础。

In the joint multiple access systems , which are based on the CDMA and SDMA techniques , the assignment of spreading codes should be based on the orthogonality of the spatial vector of the mobile users .

在基于码分多址（CDMA）和空分多址（SDMA）技术的联合多址系统中，扩频码的分配应根据移动用户空间向量的正交性来进行。