TY - GEN
T1 - DADS with short spreading sequences for high data rate communications or improved BER performance
AU - Le Nir, Vincent
AU - Scheers, Bart
PY - 2013
Y1 - 2013
N2 - In this paper, a method is proposed to improve the performance of the delay and add direct sequence (DADS) modulation scheme. On one hand, the selection of a short pseudonoise (PN) sequence is used to improve the data rate performance. On the other hand, when high data rates are not required, the same short PN sequence is replicated to form a long PN sequence. In this case, noise reduction by averaging is used to improve the bit error rate (BER) for high spreading factors. Theoretical BER formulas are derived and verified by simulations in additive white Gaussian noise (AWGN) and frequency selective Rayleigh channels. The proposed DADS modulation scheme is implemented using the CogWave software to allow the exchange of video, audio and text between two USRPs through a graphical user interface (GUI) developed in Qt4.
AB - In this paper, a method is proposed to improve the performance of the delay and add direct sequence (DADS) modulation scheme. On one hand, the selection of a short pseudonoise (PN) sequence is used to improve the data rate performance. On the other hand, when high data rates are not required, the same short PN sequence is replicated to form a long PN sequence. In this case, noise reduction by averaging is used to improve the bit error rate (BER) for high spreading factors. Theoretical BER formulas are derived and verified by simulations in additive white Gaussian noise (AWGN) and frequency selective Rayleigh channels. The proposed DADS modulation scheme is implemented using the CogWave software to allow the exchange of video, audio and text between two USRPs through a graphical user interface (GUI) developed in Qt4.
KW - Spread spectrum modulation scheme
KW - noncoherent detection
KW - transmit reference
UR - https://www.scopus.com/pages/publications/84893211357
M3 - Conference contribution
AN - SCOPUS:84893211357
SN - 9788393484843
T3 - 2013 Military Communications and Information Systems Conference, MCC 2013
BT - 2013 Military Communications and Information Systems Conference, MCC 2013
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - 2013 Military Communications and Information Systems Conference, MCC 2013
Y2 - 7 October 2013 through 9 October 2013
ER -