基带信号的码型（国外英文资料）.docVIP

基带信号的码型（国外英文资料） Baseband signal The receiving signal is received by an rf signal before decoding the decoding. At launch time, the pre-modulated signal is encoded but not modulated. Youre used to calling it I and Q. But in fact, because of the development of chip technology, the baseband signal has been delivered in the form of data flow, such as V70. ... You dont have a baseband signal, a jump to a dc level, and the base band signal is 67KHz, the most pronounced in the samsung 600. Further: digital oscilloscopes do not have a good analog in the phone, especially in the case of a mutation. The type of a digital baseband signal The type of a digital baseband signal Here is the gist of the book: The code design principle of digital baseband signal is commonly used in the digital baseband signal power spectrum The code design principle of 4.1.1 digital baseband signals The so-called digital baseband signal is the electrical pulse of the message code -- the waveform. In actual baseband transmission system, not all of the original digital baseband signal can transfer in the channel, for example, contains rich dc and low-frequency components of baseband signal is not suitable for transmission in the channel, signal because it has the potential to cause serious distortion; Again, for example, general baseband transmission system is extracted from the received baseband signal synchronizing signal, and a synchronization signal is dependent on the type of the code, if the code appeared for a long period of time The 0 symbol, the base band signal may be up to zero for a long time It is possible to make a synchronous recovery system unable to guarantee the accuracy of the bit synchronization signal. The actual baseband transmission system may also propose other requirements, which leads to the possibility of the baseband signal. In summary, there are two main requirements for the base band signal for transmission: (1) the requirement of all kinds of code, the expectation is to