MC-DCSK 中的子载波功率分配优化算法

研究了多载波差分混沌移位键控(multi-carrier differential chaos shift keying,MC-DCSK)调制中的子载波功率分配问题,基于功率分配模型,推导了MC-DCSK以子载波功率为参数的误比特率(bit error rate,BER)表达式,基于该表达式,建立了最小化误比特率的最优化问题,并用凸优化方法获得了子载波最优功率的分配策略.通过仿真,比较了最优功率分配与等功率分配情况下,MC-DCSK在加性高斯白噪声(additive white Gaussian noise,AWGN)和Rayleigh多径衰落信道下的性能,仿真结果验证了最优功率分配策略对系统性能的重要改进,尤其当子载波数较大时,其性能增益更为明显.

Optimal sub-carriers power allocation in MC-DCSK communication system

In this paper, power allocation strategy on sub-carriers of Multi-carrier Differential Chaos Shift Keying (MC-DCSK) is studied. At first, the MC-DCSK system model with power allocated reference and information sub-carriers is presented. Then bit error rate (BER) expression of sub-carriers power allocated MC-DCSK system is derived. Based on the BER expression, the optimal sub-carriers power allocation strategy is obtained by convex optimization. The BER performance of the sub-carriers power allocated MC-DCSK system is evaluated and compared with the conventional MC-DCSK system with equal power allocations under additive white Gaussian noise (AWGN) and Rayleigh multipath fading channels. Simulation results confirm the significant advantages of the optimal sub-carriers power allocation when the number of sub-carriers is large.