摘要
A dual N-ary orthogonal hybrid modulation system is introduced in this paper, which can increase the data rate greatly compared with conventional N-ary orthogonal spread spectrum system, so it can be used for high rate data communication. Then, three code recognition algorithms are presented for dual N-ary orthogonal hybrid modulation system and the analytic bit error rate （BER） performance of the system in additive white Gaussian noise （AWGN） and fiat Rayleigh fading channel is derived. Finally, the computer simulation of the system with three code recognition algorithms is performed, which shows that the simplified maximum a posteriori （MAP） algorithm is the best for the system with a compromise between the performance and the complexity.
A dual N-ary orthogonal hybrid modulation system is introduced in this paper,which can increasethe data rate greatly compared with conventional N-ary orthogonal spread spectrum system,so it can beused for high rate data communication.Then,three code recognition algorithms are presented for dual N-ary orthogonal hybrid modulation system and the analytic bit error rate(BER)performance of the systemin additive white Gaussian noise(AWGN)and flat Rayleigh fading channel is derived.Finally,the com-puter simulation of the system with three code recognition algorithms is performed,which shows that thesimplified maximum a posteriori(MAP)algorithm is the best for the system with a compromise betweenthe performance and the complexity.
基金
the National Basic Research Program of China(No5130601)
Jiangsu Provincial Natural Science Foundation(NoBK2006701)
