The authors describe an advanced wide band modulation technique based upon direct sequence spread spectrum (DS/sup 3/) technology. The new method has proven to be highly effective in tests conducted both in field trials, in different countries, and in the laboratory under simulated conditions.de ...
1.0 Direct Sequence Spread Spectrum (DSSS) Modem Reference Design Functional Specification 14 Introduction Much of the signal processing performed in modern wireless communications systems—such as digital modulator/demodulator applications—takes place in the digital domain and requires high throughput. ...
2.1 Introduction of Direct Sequence Spread Spectrum [1] Intelecommunications, direct-sequence spread spectrum (DSSS) is amodulationtechnique. As with otherspread spectrumtechnologies, the transmitted signal takes up morebandwidththan the information signal that is being modulated. The name 'spread spectrum...
This term is also known as direct sequence code division multiple access. Techopedia Explains Direct Sequence Spread Spectrum DSSS is a spread spectrum modulation technique used for digital signal transmission over airwaves. It was originally developed for military use, and employed difficult-to-detect ...
The 802.11b is implemented by using the direct sequence spread spectrum (DSSS) technique called complementary coded keying (CCK) with a bandwidth 25 mHz. The 802.11a/g are implemented by using the OFDM modulation with a bandwidth of 20 mHz. The development in 802.11n is proposed to increase ...
We present a new scheme to reduce the communications requirements for sending noise-tolerant message authentication codes (NTMACs), by sending the NTMAC's over direct sequence spread spectrum wireless channels. We greatly reduce the number of chips required by replacing each sub-MAC with a chip ...
it suffers from multi-path propagation as compared to 802.11 b/g. The 802.11b is implemented by using thedirect sequence spread spectrum(DSSS) technique called complementary coded keying (CCK) with a bandwidth 25mHz. The 802.11a/g are implemented by using theOFDMmodulation with a bandwidth of ...
The direct-sequence spread-spectrum (DSSS) technique has been widely used in wireless secure communications. In this technique, the baseband signal is spre... S Zhang,F Liu,Y Huang,... - 《Sensors》 被引量: 0发表: 2021年 Soft -output detection and decoding algorithms with joint channel es...
We examine the performance of a direct-sequence spread spectrum (DS-SS) code-division multiple-access (CDMA) system used in a spectral overlay mode in the Microwave Landing System (MLS) band, from 5091-5150 MHz. The purpose of the overla... DW Matolak,JT Neville - 《Journal of Aerospace...
Direct sequence spread spectrum (DSSS) has been widely used in underwater acoustic (UWA) communications. In DSSS communications, spreading sequence’s period and chip rate are important characteristic parameters. However, these characteristic parameters may be detected in hostile environments due to the...