这篇论文的研究的是CDMA系统中的多用户接收的问题，包括单天线系统和多天线系统。
This paper focuses on the multiuser detection in CDMA system, which includes SISO and MIMO systems.
今年一月，一位血友病患者在网上揭露百度将血友病吧经营权卖给他人，导致许多用户接收到可疑的医疗建议。
In January, a hemophilia sufferer revealed online that Baidu had sold moderation rights for several disease-related forums, and as a result, users received dubious medical advise.
这个API支持一次将消息发送给许多用户，并允许接收者对发送者进行响应。
This API enables sending one-time messages to many users at once and allows the receivers to respond to the sender.
RAKE接收机对于慢移动深衰落环境更为敏感，并且上行链路在多用户情况下存在明显的误码平台。
RAKE receiver is sensitive to slow speed and deep fading condition, and there obviously exists error floor in uplink under multi-user condition.
提出一种基于信号子空间估计，用于频率选择性衰落信道的盲多用户自适应接收机。
In this paper, a blind multiuser receiver for frequency-selective fading channel based on subspace tracking has been presented.
提出了一种行之有效的将智能天线技术同多用户检测技术结合的空-时接收方法，并对其参数进行了优化。
An effective space-time receiver scheme that combines smart antennas with multiuser detection is proposed and its parameter is optimized.
接收端使用最大似然检测器，利用所有接收信号进行多用户联合检测。
The Maximum Likelihood Detector is used in the receiver for joint detection using all received signals.
数值计算和计算机仿真结果表明了高斯噪声、多用户干扰、多径衰落以及分集接收等对系统性能的影响。
Numerical and simulation results show that the Gaussian noises, multi user interferences, multipath fading and diversity receiving all have impact on the system performance.
提出了一种新的基于子空间跟踪的自适应阵ds - CD MA多用户干扰抑制接收机。
It brings up a new DS-CDMA multiuser interference suppression receiver with a subspace tracking adaptive array.
基于子空间的盲多用户检测将接收信号投影到信号子空间，可以提高检测性能，并且可采用复杂度较低的子空间追踪算法实现。
The performance of subspace method is improved by projecting the received signals to the signal subspace. And it can be executed by subspace tracking algorithms with low computational complexity.
另外，在多用户MIMO系统中，由于各个用户接收机只能进行分布式处理，因此接收端的联合检测算法不适用。
Meanwhile, in multiuser MIMO (MU-MIMO) systems, because only distributed receiver process can be supported, the joint detection at the receiver side is not feasible.
在CD MA移动通信系统中，多址接入干扰可以通过多用户检测技术来消除，而分集接收可以减小信道衰落的影响。
In CDMA mobile communication systems, multiple access interference can be cancelled by multiuser detection technique. The degradation by channel fading can be reduced by diversity reception.
然后，对接收到的信号应用最小均方误差滤波恢复单用户信号波形，从而同时实现了多用户信号分离及频率同步；
Next, minimum mean square error (MMSE) filters are applied to the received signal to recover single user signal wave thus implementing user separation and frequency synchronization at the same time.
接收端采用串行干扰抵消的方法去除或抑制很严重的多用户干扰，该方法实现简单，适合瑞利衰落信道。
In the receiver, successive interference cancellation is employed to remove or suppress sever multiuser interference, and this detector is easy to implement and apt to Rayleigh fading channel.
在系统中存在多用户干扰及接收机散粒噪声的情况下，推导出该系统误码率上限，并对该系统特性与无光硬件限幅器的光PPM- CDMA通信系统特性作了比较。
The performance of the system is evaluated when considering the effects of both multi user interference and photo detector shot noise. An upper bound on the bit error rate is derived.
在上行链路中每个用户由于载波频率偏差而存在潜在的不同步，这样使子载波之间失去正交性，从而在基站接收端产生多用户间干扰。
However in uplink channel, each user has its own frequency offset which leads to a loss of orthogonality among the sub-carriers and multiuser interference at the base station receiver.
在上行链路中每个用户由于载波频率偏差而存在潜在的不同步，这样使子载波之间失去正交性，从而在基站接收端产生多用户间干扰。
However in uplink channel, each user has its own frequency offset which leads to a loss of orthogonality among the sub-carriers and multiuser interference at the base station receiver.
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