下行频率

利用上述移不变性性质，本文进一步提出了相应的下行频率选择性衰落MIMO无线信道的盲估计方法。

By exploiting the induced shift-invariance property , one blind estimation method of downlink frequency-selective fading MIMO wireless channels is further derived .

在不同调制下，分析了Ka频段卫星的上行和下行频率在不同链路余量时的误码率特性。

The BER characteristics in different link margin for up-link and down-link in Ka-band are analyzed at different modulations , respectively .

研究下行频率选择性衰落环境中垂直分层空时正交频分复用（V-BLASTOFDM）系统的信道盲估计问题。为V-BLASTOFDM系统提出了一种新颖的贴标签型延迟分集结构。

The blind estimation problem of channels was investigated for the combining form of the vertical Bell Labs layered space-time ( V-BLAST ) architecture and the orthogonal frequency-division multiplexing ( OFDM ) technique , i.e. the V-BLAST OFDM system , under the downlink frequency-selective fading environment .

试论我国卫星广播电视下行频率的选择

Discussion about the selection of down frequency satellite broadcast television in our country

对于下行频率复用，介绍了软频率复用和部分频率复用方案及两种方案的特点。

Soft frequency reuse and partial frequency reuse schemes are introduced and analyzed for downlink .

该文着重研究MCV-BLAST系统在下行频率选择性衰落环境中的解码问题。

This paper explores the decoding problem of the MC V-BLAST system under the downlink frequency-selective fading environment .

然后测量其中一个下行频率后，就能计算星载振荡器的频率值。

Then the satellite oscillator frequency can be calculated after one of the two frequencies of the downward signals has been measured .

介绍了多功能双向光纤传输平台（HFC）的系统方案、硬件实现和实验结果，整个系统包括上行光端机、下行光端机、频率变换器、频谱监测器、射频调制解调器以及网络管理软件。

This paper proposes the scheme , hardware implementation and experiment result of HFC . The system is composed of upward and downward channel optic transmission equipments , shifting frequency equipment , monitoring spectrum equipment , modulator / demodulator and network management software .