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根据GPS信号的结构和调制特点，加上环境噪声，模拟出GPS中频数字信号。
According to GPS signal structure and modulation characteristics, a GPS intermediate frequency digital signal is simulated under the condition of noise environment.
OFDM系统自身的正交多载波调制特点，决定了其对定时误差和载波频率偏差十分敏感。
The orthogonal multicarrier modulation, which is the main character of OFDM, determines that it is very sensitive to both timing synchronization error and carrier frequency offset.
先分析标签负载调制的基本原理和反射信号的调制特点，再详细阐述检测通道关键环节设计与实现。
The basic theory of tag's load modulation and the key features of backscatter signal are analyzed. The design of key nodes of the whole detecting channel is demonstrated in detail.
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