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- A better method for direct sequence spread spectrum(DSSS) receiver to decrease the acquisition time is proposed. 提出一種減小直接序列擴頻(DSSS)接收機信號捕獲時間的改進方法。
- This paper proposes a method for narrowband interference suppression in Direct Sequence Spread System(DS-SS). 該文提出一種基於門限估計的直接序列擴頻(DS-SS)通信系統窄帶干擾變換域抑制方法。
- Blind despread of multi-sequence Direct Sequence Spread Spectrum signals (tamed DSSS signals) with unknown spreading codes are discussed in this paper. 該文研究的是在未知擴頻序列的情況下,實現多序列直擴信號(也稱軟擴頻信號)的解擴。
- This paper introduces GMSK into Direct Sequence Spread Spectrum(DSSS) communication system in order to obtain good performance of power spectrum. 本文將GMSK調製引入到直接序列擴頻通信系統中,以期獲得更好的功率譜利用率。
- Direct Sequence Spread Spectrum(DSSS)method is a major kind of anti-jamming technique which has been used extensively in communication fields. 直擴技術是一種在通信領域獲得廣泛應用的主要通信抗干擾技術。
- The topic of this paper comes from the need of pricise carrier frequence measuring of Direct Sequence Spread Spectrum signal. 本論文課題來源於工程中要求對直接序列擴頻信號載波頻率進行精確測量的客觀需求。
- Also,802.11 maintained compatibility with the three most popular radio transmission types: direct sequence spread spectrum,frequency-hopping spread spectrum,and infrared. 802.;11也保持了與三種最流行的無線電傳輸方式(直接順序擴頻、跳頻擴頻和紅外線)的兼容性。
- When the strong tone interference exists in the Direct Sequence Spread Spec-trum(DSSS) system, the traditional linear prediction filter performs poorly. 在很強的單音干擾存在時,傳統的線性預測濾波方法不能達到很好的抗干擾性能。
- An efficient method that can blindly estimate and synchronize to PN sequence of direct sequence spread spectrum (DS-SS) signal quickly is presented in a non-cooperative context. 摘要在非協作信息偵測情況下,提出了一種實用的直接序列擴頻(DS-SS)通信信號PN碼序列的快速盲估計方法。
- In direct sequence spread spectrum communication system, enemy is assumed to detect whole PN sequence chip by chip and a modulated retransmitted interference is created. 在直接序列擴頻通信系統中,假設敵方能夠逐個比特地檢測到整個PN序列,併產生一個調製的轉發乾擾。
- Also, 802.11 maintained compatibility with the three most popular radio transmission types: direct sequence spread spectrum, frequency-hopping spread spectrum, and infrared. 11也保持了與三種最流行的無線電傳輸方式(直接順序擴頻、跳頻擴頻和紅外線)的兼容性。
- It is a necessary process to estimate the spread spectrum sequence for direct sequence spread spectrum (DSSS) signal for blind de-spreading in non-cooperative communications. 摘要在非協作條件下直接序列擴頻(DSSS)信號的擴頻序列估計是盲解擴的必需環節。
- The performance of hybrid spread spectrum communication systems is compared with those of the frequency hopped systems and direct sequence spread spectrum communication systems. 並且將混合擴頻通信系統與跳頻通信系統和直接序列擴頻通信系統的性能進行了分析、比較。
- To solve the problem of tracking for direct sequence spread spectrum signals where data is non-coherent with code, a new method of tracking is presented. 摘要針對數據位和偽碼周期非相參時直接序列擴頻信號的跟蹤問題,提出了一種新的跟蹤方法。
- In the acquisition ways of the direct sequence spread spectrum code,sequence probability ratio test(SPRT) acquisition is a better way,acquisition time reduced 2 to 10 times compared with correlation acquisition. 在直擴編碼的捕捉方法中;序貫捕捉法是一種較好的捕捉方法;與相關捕捉法相比其速度能提高2~10倍.
- Based on the experience in building WLAN in a mountain area county, the author analyses the direct sequence spread spectrum in WLAN transmission technique, the composition of WLAN and their applications, as well as the standard of WLAN. 本文基於在一個山區縣建成無線區域網的實踐,研究無線區域網傳輸技術當中的直接序列擴頻、無線區域網系統的組成和各種應用,並介紹無線區域網的標準。
- An algorithm based on the Haar wavelet transform(HWT) was developed for blind estimates of pseudo-random code(PC) rates and symbol periods of direct sequence spread spectrum(DS/SS) signals in low signal to noise ratio environments. 為解決低信噪比下直擴信號的參數估計問題,提出了一種基於H aar小波變換實現直擴信號偽碼(PC碼)速率和符號周期盲估計的新型演算法。
- This paper has introduced the structure and work mode of DDS chip AD9854. And this chip's applications in direct sequence spread spectrum and frequency hopping has been researched into. 摘要介紹了AD9854的結構及工作模式,並對AD9854晶元在擴頻通信的直接序列擴頻工作方式和跳變頻率工作方式中的應用進行了研究。
- In direct sequence spread spectrum multiple access (DS-CDMA) communication system, in order to transmit high rate data, a orthogonal sequence multicode CDMA system (called OMC-CDMA) is proposed. 在直接序列擴頻通信(DS-CDMA)系統中,為了有效地實現用戶高數據率的傳輸,本文提出了一種正交擴頻多碼CDMA系統(稱為OMC-CDMA)。
- A new method based on Multi-code Direct Sequence Spread Spectrum(MC-DSSS)technology is proposed to insert a spread spectrum watermarking into a spread spectrum communication signal? 本文提出了一種基於多碼擴頻(MC-DSSS)技術的數字水印嵌入方法,即利用擴頻碼的正交性將擴頻水印嵌入到擴頻通信信號中。