Frequency-hopped spread-spectrum random access with retransmission cutoff and code rate adjustment

1992 ◽  
Vol 10 (2) ◽  
pp. 344-349 ◽  
Author(s):  
Sang Wu Kim
Keyword(s):  
Spread Spectrum ◽  
Random Access ◽  
Code Rate ◽  
Rate Adjustment

scholarly journals Online rate adjustment for adaptive random access compressed sensing of time-varying fields

2016 ◽  
Vol 2016 (1) ◽  
Author(s):  
Naveen Kumar ◽  
Fatemeh Fazel ◽  
Milica Stojanovic ◽  
Shrikanth S. Naryanan
Keyword(s):  
Compressed Sensing ◽  
Random Access ◽  
Time Varying ◽  
Rate Adjustment

Parameter Estimation of the Direct Sequence Spread Spectrum Signal Based on Time-Smoothing Cyclic Periodogram

2012 ◽  
Vol 195-196 ◽  
pp. 181-185
Author(s):  
Peng Zheng ◽  
Feng Liu ◽  
Xin Zhang
Keyword(s):  
Parameter Estimation ◽  
Spread Spectrum ◽  
Code Rate ◽  
Direct Sequence Spread Spectrum ◽  
Direct Sequence ◽  
Limited Data ◽  
Simulation Results ◽  
Digital Communication System ◽  
Data Length ◽  
Cyclic Spectrum

The direct sequence spread spectrum (DS-SS) signal is a typical kind of LPI signals widely-used in the modern digital communication system, and it is difficult to be detected for its statistical characteristic similar to noise. An algorithm for estimating the code rate, carrier frequency of DS-SS signals was proposed using time-smoothing cyclic periodogram instead of cyclic spectrum according to cyclostationary feature of DS-SS signal to improve the precision of parameter estimation. The estimation performance was analyzed for the cyclic spectrum by time-smoothing cyclic periodogram from the tapering points in the case of limited data length. Simulation results showed that the proposed algorithm is effective.

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