Title :
Propagation-medium matched direct-sequence (PM-MDS) spread-spectrum signals
Author :
El-Khamy, Said E. ; Dobaie, Abdullah M.
Author_Institution :
Dept. of Electr. Eng., Alexandria Univ., Egypt
fDate :
10/1/1991 12:00:00 AM
Abstract :
The distortion of high-data-rate digital radio signals, such as direct-sequence-spread-spectrum (DS-SS) signals, when transmitted through dispersive media greatly degrades the system performance. The design of propagation-medium matched direct-sequence signals that overcome the performance degradation caused by the medium dispersion is described. The performance of PM-MDS signals in multipath dispersive media is evaluated and compared with the corresponding performance when randomly selected (unmatched) DS signals are used. The results show the advantages of PM-MDS transmission. The proposed PM-MDS signals do not require the use of sophisticated signal processing at the receiving ends, and are thus most suited for secure communication systems using one central transmitting station and numerous receiving units
Keywords :
digital radio systems; fading; radiowave propagation; spread spectrum communication; PM-MDS signals; digital radio signals; fading; multipath dispersive media; propagation-medium matched direct-sequence signals; radiowave propagation; spread-spectrum signals; Bandwidth; Chirp modulation; Degradation; Digital communication; Dispersion; Distortion; Fading; Frequency modulation; Signal processing; Spread spectrum communication;
Journal_Title :
Antennas and Propagation, IEEE Transactions on
