另外,我们看到的108M产品则是生产厂商经过扩频后(Super G)得到的产物,包括Super G 108M产品在内的125M无线产品,都应该算是在通往IEEE802.11n道路上的过渡产品。
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说明:编码器生成M序列进行通信,接收后再进行解码。用于扩频率通信中。通过状态机实现。
The encoder generates the m sequence for communication, the receiver and then decoded. For the expansion of the frequency communications. Through the state machine implementation.
扩频系统中性能最好的是直接序列扩频的先解扩后解调方式。
Direct sequence spread spectrum (DSSS) and despreading first structure is most advantageous of all kinds of spread spectrum techniques.
应用扩频原理,能大大改善水印嵌入的不可感知性。 但由于采用扩频调制后,一个水印信息要用一个周期的伪随机序列调制,因此会增加嵌入的水印量。
Equally, spreading spectrum technology can improve the performance of watermark technology greatly, but it will increase the capacity of channel and the calculation of the algorithm as cost.
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