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相干载波
相关语句
  coherent carrier
     Simulation Research on Coherent Carrier Extraction for QPSK Signals
     QPSK信号相干载波提取的仿真研究
短句来源
     Behavior of costas loop in presence of coherent carrier
     相干载波存在情况下的Costas环性能
短句来源
     Analyzes the behavior of a Costas Loop in the presence of coherent carrier.
     主要给出当输入信号为存在相干载波的合成数据调制信号时Costas环的工作性能 .
短句来源
     By using high-performance and high-density devices, the coherent carrier, side-tone and telecontrol signal can be recovered accurately.
     高性能高集成度芯片从硬件上保证了相干载波的精确输出和测距音遥控信号的精确恢复。
短句来源
     It also give an improved method for PLL(phase locked loop) to extract coherent carrier.
     本文还对相干载波提取中的锁相环提出了一种改进方法。
短句来源
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  “相干载波”译为未确定词的双语例句
     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。
短句来源
     The power spectrum density is decreased, the frequency usage efficiency is improved and the multi-access application is allowed.
     由此降低了功率谱密度,提高了频带使用效率和便于多址应用。 通过对每个相干载波信号CI扩频且合成,其效果 很好。
短句来源
     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,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,将会引入较多的误码.
短句来源
     The Research on the Costas-loop used for the Carrier Synchronization
     用于相干载波提取的costas环的研究
     To analyze the effect of imperfect coherent detection, the equivalent distances are derived.
     为了分析非理想相干检测的影响,首先导出相干载波相移θ时信码判决时的等效距离,然后求出在给定条件下的事件错误率及它们的上限。
短句来源
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  相似匹配句对
     Carrier recovery for continuous phase frequency shift keying coherent detection
     相位连续频移键控相干解调载波的提取
短句来源
     The Research on the Costas-loop used for the Carrier Synchronization
     用于相干载波提取的costas环的研究
     Odd-even Coherent State of q-
     q——奇偶相干
短句来源
     Coherent Excitation on Biological System
     生物系统的相干激励
短句来源
     Automatic analysis of holographic interference photo-carrier fringe patterns
     载波全息干涉图的自动分析
短句来源
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This paper breifly describes the principal methods of despreading direct-sequence spread-spectrum signals, bit-by-bit despreading and parallel despreading. It is shown in this paper that the parallel despreading method is suitable for burst spread spectrum communications. By a proper signal design, the authors have despreaded burst spread spectrum signals by means of surface acoustic wave (SAW) convolvers developed in our country. Some related results are also shown in this paper.

本文简要叙述了直接序列扩频信号解扩的主要方法:逐比特解扩(bit-by-bitDe-Spread)和并行解扩(Parallel De-Spread)。指出:前一种方法要提取相干载波,并且难以实现快速同步。对于突发工作的直接序列扩频系统,并行解扩是比较切实可行的。我们用国内研制成功的声表面波声电卷积器,通过适当的信号设计完成了突发扩频信号的解扩。文章给出了有关实验结果。我们认为,这种方法,对不同调制方式的直接序列扩频信号解扩具有普遍适应性。

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.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.To analyse the effect of imperfect coherent detection,the equivalent distances under some recovered carrier phase offsets are derived.Then...

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.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.To analyse the effect of imperfect coherent detection,the equivalent distances under some recovered carrier phase offsets are derived.Then the conditional event error probability and it's upper bound with respect to recovered carrier phase offset are taken into account.The computing methods and results for the average event and bit error probabilities of the 4-state 2/3-TCM and uncoded QPSK schemes with noisy phase reference are given.

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.然而,就相同的载噪比C/N,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,将会引入较多的误码.为了分析非理想相干检测的影响,首先导出相干载波相移θ时上述两系统信码判决间的等效距离.然后分别用系统模拟和解析方法求出在给定各种条件下的事件错误率及其上限.显然,编码功率增益将随相干载波相位偏移的上升而下降.最后给出在不同载噪比时上述两系统平均事件错误率和平均信息比特错误率的求解方法及其计算结果.从所得的计算结果中可以看出,要得到较高的TCM编码功率增益,降需要一对载噪比较高的相干载波.在一般情况下,这个条件较难满足.

Trellis-coded modulation (TCM) in 8-PSK scheme is more power efficient than uncoded QPSK in the case of perfect detection. 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. To analyze the effect of imperfect coherent detection, the equivalent distances are derived. Then the conditional event error probability and its upper bound with respect to recoverd carrier phase offset are taken into account....

Trellis-coded modulation (TCM) in 8-PSK scheme is more power efficient than uncoded QPSK in the case of perfect detection. 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. To analyze the effect of imperfect coherent detection, the equivalent distances are derived. Then the conditional event error probability and its upper bound with respect to recoverd carrier phase offset are taken into account. The results for the average event and bit error probabilities of the 4-state 2/3-TCM and uncoded QPSK schemes with noisy phase reference are given. It is shown by the results that very high values of phase reference SNR are required for the efficient implementation of TCM scheme.

理想相干检测时,8—PSK方式的格栅编码调制(TCM)与QPSK方式相比,可以得到较高的编码增益,且不会增加系统的所需带宽。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。为了分析非理想相干检测的影响,首先导出相干载波相移θ时信码判决时的等效距离,然后求出在给定条件下的事件错误率及它们的上限。显然编码增益将随相干载波相位偏移的上升而下降。最后给出在不同载噪比时系统平均事件及比特错误率的求解方法及它们的计算结果。从所得的计算结果可以看出,要得到较高的TCM编码增益,将需要一对载噪比极高的相干载波。在一般情况下,这个条件较难满足。

 
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