diversity gain

An improved space time coding method for the simple situation ( 4PSK, 4 states) is given in this paper. The method improves the coding gain without impairing the diversity gain of the system.

提出了简单情况下（4-PSK、4状态）的一种改进的空时编码方案，该方法在保证空时编码的分集增益的前提下，进一步提高了系统的编码增益。

Compared with conventional cooperative diversity schemes, multi-user cooperation through network coding can attain higher diversity gain and lower symbol error probability.

在多用户协作通信网络中采用网络编码技术，可获得更高的分集增益以及更低的符号错误概率。

Multiple Input Multiple Output ( MIMO) antenna is a typical spatial diversity technique, by combining multiple antennas space-time block coding with orthogonal frequency division multiplexing ( OFDM) forming space-frequency block coding, In multipath channel fading conditions, which also can get additional frequency diversity gain.

多输入多输出天线既是一种空间分集技术，将多天线中的空时分组编码与正交频分复用技术相结合构成空频分组编码，在多径衰落信道条件下还可以获得额外多径分集增益。

The computer simulation results demonstrate that ARQ-MMSE-DFD cooperative communication system can further improve the system reliability by the time diversity gain achieving by the ARQ technology.

通过计算机仿真，证明了ARQ-MMSE-DFD协作通信系统利用自动重传带来的时间分集增益可以进一步提升通信系统的可靠性。

This invention can effectively obtain higher diversity gain.

本发明可以有效的获得更高的分集增益.

On above basis, the system gets extra extra time diversity gain with code combining at the destination.

在此基础上，接收端进行码合并，进一步为系统带来了额外的时间分集增益。

On the Performance of Multi-User Diversity Gain in MIMO Fading Channel

MIMO衰落信道的多用户分集性能分析

A space-time-frequency ( STF) coded orthogonal frequency division multiplexing ( OFDM) transmitter diversity scheme for fast fading frequency selective channels is proposed. The proposed STF-OFDM transmission scheme owns time diversity gain.

提出了一种基于空间时间频率（STF）编码的正交频分多路复用（OFDM）发射分集方案，这种传输方案可用于频率选择性快衰落信道。

The novel cooperative communication scenario takes both the direct link and relay link of secondary user into consideration for data transmission. Then the receiver of secondary user merges the signals from the two links to obtain diversity gain and improve system performance.

新的协作通信场景是指同时利用次级用户的直接链路和中继链路来协同传输数据，次级用户的接收端通过对两条链路的信号进行合并处理，从而获得分集增益，提升系统的性能。

Therefore a diversity gain can be obtained in a broadband fading channel.

因此，在宽带衰落信道中可获得分集增益。

Its main idea is by increasing the relay link to form a virtual MIMO, so as to achieve distributed transmission and the diversity gain.

其主要思想就是通过增加中继链路以形成虚拟MIMO，从而达到分布式传输，来获得分集增益。

Space time coding is a channel coding scheme for MIMO system, which combines the merits of the spatial-diversity and time-diversity. It provides both diversity gain and coding gain, which can provide much higher data rate-to-bandwidth ratio than single-antenna system.

空时编码是适合于多天线阵信道的一种编码方案，它综合了空间分集和时间分集的优点，同时提供分集增益和编码增益，能够获得远远高于传统单天线系统的频谱利用率。

Space-Time coding is a coding technique to achieve the diversity gain of multiple antennas system.

时空 编码是一种可以从多重天线系统中得到分集增益的编码技术.

mimo can improve spectral efficiency by using the technology of space division multiplexing, diversity gain and beamforming.

因而多入多出信道通过空间复用、分集增益和波束成形等技术，能够大大提高频谱利用率的优点，成为LTE通信系统的核心技术之一。

Multi-receive antennas can also provide the diversity gain for LLR information and iterative extrinsic information.

多接收天线可以对判决似然比和迭代译码的外部信息提供分集增益,从而进一步提高系统性能.

Keeping full diversity order gain, the design can achieve 0.5 transmission rate.

该方案保证系统获得满分集度增益情况下, 实现码率为0.5的传送指标.

It can explore the spatial diversity gain and time diversity between the antennas.

它能够挖掘天线间的空间分集、时间分集。

For one thing, layered space-time code structure provide higher spectrum efficiency, but it possesses the bad performance of anti-fading. For another, space-time block code has a good anti-fading performance, simple structure and can achieve full implementation transmit diversity gain.

其中分层空时码能提供较高的频谱利用率，但其抗衰落性能差；而空时分组码具有较好的抗衰落性能、结构简单易实现且能达到满发射分集增益。

Over independent Rayleigh fading channels, this scheme can achieve the maximum diversity gain receive antennas.

在独立瑞利衰落信道情况下, 能够实现满分集增益.