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1.发明授权Dynamic measurement of communication channel characteristics using direct sequence spread spectrum (DSSS) systems, methods and program products 失效使用直接序列扩频（DSSS）系统，方法和程序产品对通信信道特性的动态测量公开(公告)号：US07088766B2
公开(公告)日：2006-08-08
申请号：US10014455
申请日：2001-12-14
CPC分类号： H04B1/707 , H04B1/7095
摘要： A DSSS system determines transmission reliability of a communication channel in real time. A DSSS transmitter (f0=1/T) generates a Pseudo Noise (PN) code and modulates a carrier source [cos. (2Σγc)] with a selected chip rate. The transmitter bandwidth is a direct function of the chip rate. The PN coded carrier signal is further modulated by a data signal [m(t)] to provide an output signal [s(t)] to a correlator via a communication channel for purposes of determining the transmission characteristic of the channel. The correlator running a variable length pseudo noise code combines the code and the carrier which relates the incoming data signal to a correlation value for detecting the data signal. The correlation value is compared to a threshold value based upon experience of reliable transmission of data through the communication channel. The value of the correlation value declines as the data is attenuated in the communication channel, thus, the band limiting effect of the communication can be determined by the change in the correlation value.
摘要翻译： DSSS系统实时确定通信信道的传输可靠性。 DSSS发射机（f 0 0 = 1 / T）产生伪噪声（PN）码，并调制载波源[cos。 （2Sigmagamma c））]。 发射机带宽是芯片速率的直接函数。 PN编码的载波信号被数据信号[m（t）]进一步调制，以通过通信信道向相关器提供输出信号[s（t）]，以便确定信道的传输特性。 运行可变长度伪噪声码的相关器将代码和将输入数据信号相关联的载波组合成用于检测数据信号的相关值。 基于通过通信信道可靠地传输数据的经验将相关值与阈值进行比较。 在通信信道中数据被衰减时，相关值的值下降，因此通信的频带限制效果可以通过相关值的变化来确定。
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