浅析数字信号的载波传输

字数:3685,页数:22   附任务书,开题报告

摘   要

     数字通信中，有效性可用单位频率的信息传输速率[（b/s）/Hz]来衡量。可靠性常用误比特率度量。采用匹配滤波器可实现最佳接收，即达到最低的误比特率。为了提高频谱的利用率，则可以采用多进制数字调制：MASK、MFSK、MPSK和MQAM等。目前应用最为广泛的是MPSK和MQAM。MPSK是用M个相位来表示多种基带电平。但随着M的增加，对载波同步和解调精度的要求也随之增高。MDPSK中采用差分相干解调，可以避免提取同频同相的精确载波，但误比特率性能有所下降。
关键词：有效性；数字调制；正交幅度调制

Brief analysis digital signal carrier transmission
Ling Zhu
0501 Electronic information

Abstract: In the digital communication, the valid available unit frequency intelligence transmission speed [(b/s)/Hz] weighs.The reliability harms the bit rate measure commonly used.Uses the matched filter to be possible to realize the best receive, namely achieved lowest harms the bit rate.In order to enhance the frequency spectrum the use factor, then may use the multiple system numeral modulation: MASK, MFSK, MPSK and MQAM and so on. At present applies most widespread is MPSK and MQAM.MPSK is expresses many kinds of baseband level with M phase.But along with M increase, to carrier synchronization and demodulation precision request also along with it markup.In MDPSK uses the difference demodulation, may avoid withdrawing the frequency synchronism the precise carrier, but harms the bit rate performance to have the drop.
Key words: Validity; Digital modulation; Quadrature amplitude modulation

目  录
摘要 .....................................................................2
第一章  二进制数字调制................................................... 3
1.1  二进制幅度键控ASK ...................................................3
1.2  二进制频移健控FSK................................................... 6
1.3  二进制相移键控...................................................... 8
第二章  数字信号的最佳接收............................................... 12
2.1  匹配滤波器 ..........................................................12
2.2  数字信号接收的统计模型 ..............................................13
2.3  最小错误概率接收机 ..................................................14
第三章  二进制数字调制的误比特率......................................... 17
3.1  二进制最佳接收的误比特率............................................ 17
3.2  信噪比、Eb/n0和带宽................................................. 19
致    谢................................................................. 20
参考文献 .................................................................21