Simulation shows that at a bit error probability of 10 ~ ( - 7 ) the suggested codes gain 3 ~ 6 dB over uncoded transmission .

仿真结果显示当误码率为10-7时，其编码增益 相对于 未 编码增加了3至 6dB。

Then according to the system structure Turbo codes applied cases and uncoded cases are simulated and an analysis of simulation results is also given .

根据该系统结构，对 没有采用 信道 编码和采用Turbo码 作为 信道 编码 两种情况的 图像 传输系统进行了仿真研究，并分析仿真结果。

The former is simple to be implemented but with poor bit error rates . The latter has satisfactory bit error rate performance which is close to the uncoded schemes but with high complexity .

前者实现简单但误码性能较差；后者误码性能接近 未 编码方案，但复杂度高。

Simulation results show that the iterative cancellation receiver in turbo coded system can gain much better performance than conventional receiver in uncoded system .

仿真结果表明在Turbo编码系统中应用软迭代干扰抵消检测比 无 信道 编码系统中传统的接收机性能有大幅度提高。

In a multipath environment an uncoded OFDM transmission system has a bit error rate ( BER ) comparable with a narrowband radio channel because the fading of each subcarrier is frequency nonselective .

在多路径环境下，因为每一个副载波的衰落是不能进行频率选择的，一个 无 编码正交频分复用传输系统与窄带无线电传输信道相比较，有一个误码率问题。

Trellis-coded modulation ( TCM ) in 8 phase-shift keying ( 8-PSK ) scheme is more power efficient than uncoded quaternary phase - shift keying ( QPSK ) at the same spectral efficiency in the case of perfect coherent detection .

在理想相干检测的情况下，8相相移键控（ 8-PSK）方式的网格编码调制（TCM）与QPSK方式相比，可以得到较高的 编码功率增益，且不会增加系统所需的带宽。

A Group-wise Full Diversity Full Rate ( GFDFR ) space-time coding scheme with moderate complexity is proposed for uncoded Multi-Input Multi-Output ( MIMO ) system .

针对 未 编码的多输入多输出（MIMO，Multi-inputmulti-Output）系统，提出一种复杂度适中的分组全分集全码率（GFDFR，Group-wiseFullDiversityFullRate）空时编码方案。

In this paper the optimum design of an adaptive modulation based on uncoded MQAM modulation assisted by wireless channel prediction for the flat Rayleigh fading channel is discussed .

该文研究了在平坦Rayleigh衰落信道下，借助于无线信道预测对一个基于 非 编码的MQAM自适应调制进行优化设计的问题。

Automatic accurate registration algorithm of corresponding uncoded points in different measurement images has been studied .

研究了不同测量图像中同名 非 编码点的自动精确配准算法。

System performance is analyzed in uncoded system .

分析了 无 编码 情况 下系统的性能。

However it seems that for the same signal-to-noise ratio ( SNR ) of phase reference the sensitivity to phase offset for 8-PSK is more serious than for uncoded QPSK .

然而就相同的载噪比C/N来讲， 8&PSK方式对于相干载波相位偏移的灵敏度要比QPSK方式大得多。

It is suggested in this study that enterprise knowledge alliance can formulate the share of uncoded knowledge .

提出了通过企业知识联盟可以形成组织 未 编码知识的共享。

System experiment has been designed . It includes detection experiment of global control points automatic accurate matching experiment of uncoded points and verification experiment of whole system measurement precision .

设计了系统实验，包括全局控制点的检测实验、 非 编码点自动精确配准实验和系统整体测量精度验证实验。

In this paper circular uncoded targets and coded targets are used as reference points and an algorithm of automatic reference point detection is proposed .

文中采用 圆形目标及编码元素作为标记点，并提出一种标记点自动检测算法。

The results show that the performance of BER of coded system has a large improvement versus uncoded one when the two systems have same code length ;

结果表明：如果两系统使用相同码长的 光地址码， 则 经过 纠错 的 编码系统同 未 经过 纠错的编码系统相比，其误码率有了明显的改善；

The scheme can keep frequency bandwidth and symbol rate as the uncoded MFSK system .

该方案可保证频带宽度和符号速率同 未 编码 的 MFSK系统一样。

For 1 bit / s / Hz average bandwidth efficiency the uncoded adaptive OFDM scheme with two transmitters and two receivers yields about 35 dB gains for a BER of 10 - 5 compared to the conventional OFDM system .

在 无 信道 编码和误比特率为10-5 条件 下，对于平均带宽效率为 1bit/（s.Hz）的双天线发射分集接收的自适应OFDM系统与传统OFDM系统相比可以获得约35dB的自适应 分集增益。

A Noncoherent Receiver of Uncoded Full Response Continuous Phase Modulation Signal

全响应 CPM信号的一种非相干接收技术