correlation detection การใช้

• An adaptive threshold control algorithm based on correlation detection
• Correlation detection scheme
• 4 . a signal detection system based on the correlation detection technique is designed . and the configuration of the detection circuit is illustrated in detail
• Firstly , the paper introduces the character and the development of all - digital receiver , then an adaptive threshold correlation detection algorithm has been presented
• Based on the theoty of statistical dctection and research on distribution of dct coefficiefits , the chapter 3 proposes a robust 3d motion blind watermark detection algorithin , which is a sign correlation detection scheme
• In this paper , the detection and parameter estimation , are studied for ds - ss / bpsk signal with low signal - to - noise ratio , including square detection , cyclic spectrum detection , correlation detection and higher - order statistics - based detection
• Several methods of sequence spread spectrum signals direction have been developed , such as energy detection , correlation detection , cepstrum detection , cyclic spectral , higher order cumulant detection , etc . these methods developed from the research of detection and estimation for ds signals
• By making use of the characteristics of pseudorandom spread spectrum sequence in time - domain , this thesis has studied the time - domain correlation detection method of the dsss / bpsk signal and proposed the time - domain difference - accumulation detection method of the dsss / bpsk signal
• At first , to estimating common parameters , in this dissertation three detection methods - square detection , spectrum correlation detection and cepstrum detection are applied to detect the ds / cdma signal . these three methods have different advantages and disadvantages respectively
• On this basis , the wavelet decomposition established on the time - domain correlation detection method provides a feasible scheme that improves performance , in a situation when it is impossible to design the pre - filter because the frequency band of the useful signal is unknown
• The correlation detection using the periodicity of the direct sequence autocorrelation function can estimate the symbol period at intermediate frequency or at baseband . simulation results indicate that the former is superior to the latter when the demodulated frequency is unequal to the carrier frequency
• The square detection can picks up the carrier frequencies , which is simple and has great performance . but this method can ’ t recognize the signal as spread spectrum signal . the spectral correlation detection method can estimates the chip rate of signal ’ s pn sequence
• Two detection methods of chirp signals are presented in the dissertation : the cyclic autocorrelation detection method and the correlation detection method of cyclic autocorrelation function . it is shown that the two methods both have an excellent performance of blind detection . the performance analyses of the two detection methods are both carried out for additive noise or multiplicative noise , and the output signal - to - noise ratio ( snr ) expressions of the two methods are also derived
• According to the principle of correlation detection , an automatic measurement system for extinction ratio of polarizer consisted of monochromator and dsp lock - in amplifier and compurer is designed not only to eliminate the influence on measurement accuracy caused by drift of intensity of light source but also to obatain approximate extinction spectrum
• Optical fourier transformation lens are designed automatically mainly depending on optical design software . after the optical original system being worked out by p , w method , they can be designed automatically by using computer . every parameter of the system is changed simultaneously and aberration is adjusted according to optimizing theory , after the parameters are iterated a lot of times , perfect fourier transformation system is obtained , and the requirement of optical correlation detection can be satisfied