Finding out the carrier corresponding the DQPSK symbols according to the frequency interleaving table; 按照频率交织规则表,找到该DQPSK码元对应的那个载波;
Under conditions of fading multipath channel, if some techniques such as OFDM ( orthogonal frequency division multiplexing), diversity, equalization, and interleaving were used to turn channel into AWGN channel, the conclusion will be also effective. 同时对于无线通信或移动通信的时变多径衰落信道,如采用OFDM(正交频分复用)、分集、均衡、交织等技术,能将信道改造为AWGN信道,该结论依然有效。
The COFDM modulation part is made up of blocks partition, COFDM symbol forming, DQPSK symbol mapping, frequency interleaving, difference modulation and COFDM modulation and so on. 实现不同帧之间的比特交织等。COFDM调制部分包括块划分及COFDM符号形成、DQPSK符号映射、频率交织、差分调制及COFDM调制等环节。
In order to improve the sampling rate for the multi channel high frequency, high speed or impulsive signal, the multi channel A/ D converter interleaving/ multiplexing technology can be adopted. 对于电力系统中的多通道高频、高速或冲击信号的采样测试,可以采用多路A/D交替顺序采样/多路复用技术来提高采样速率。
A visible light communication OFDM ( Orthogonal Frequency Division Multiplexing) modulation and demodulation simulation system has been built successfully, by adding complex channel coding and data interleaving module. 通过添加复杂的信道编码和数据交织等模块,成功搭建了一个可见光通信OFDM(正交频分复用)调制解调仿真系统。
None linear distortion is avoided during signal processing. ( 3) Modulation and multiplexing module: this module consists of several sub-modules such as QPSK modulation, frequency interleaving, differential modulation and OFDM. 在信号处理过程中避免了由于削减信号数据位宽而导致非线性失真。(3)调制复用模块:包括QPSK调制、频率交织、差分运算以及OFDM等主要子模块。