论文信息 - DADS with short spreading sequences for high data rate communications or improved BER performance

DADS with short spreading sequences for high data rate communications or improved BER performance

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.

Bart Scheers | Vincent Le Nir

[1] Bart Scheers,et al. Performance of delay and add direct sequence spread spectrum modulation scheme with fast frequency hopping in frequency selective Rayleigh channels , 2011, 2011 - MILCOM 2011 Military Communications Conference.

[2] Bart Scheers,et al. Pseudo-Random Binary Sequence Selection for Delay and Add Direct Sequence Spread Spectrum Modulation Scheme , 2010, IEEE Communications Letters.

[3] Bart Scheers,et al. A MODIFIED DIRECT-SEQUENCE SPREAD SPECTRUM MODULATION SCHEME FOR BURST TRANSMISSIONS , 2010 .