Multi-User Multi-Carrier Differential Chaos Shift Keying Communication System

In this paper, a multi user Multi-Carrier Differential Chaos Shift Keying (MC-DCSK) modulation is presented. The system endeavors to provide a good trade-off between robustness, energy efficiency and high data rate, while still being simple. In this architecture of MC-DCSK system, for each user, chaotic reference sequence is transmitted over a predefined subcarrier frequency. Multiple modulated data streams are transmitted over the remaining subcarriers allocated for each user. This transmitter structure saves energy and increases the spectral efficiency of the conventional DCSK system.Comment: Accepted in the IEEE International Wireless Communications and Mobile Computing Conference (IWCMC 2013

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

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。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.重庆工程学院校内自然科学基金(2013xzky06)~

Journal of Telecommunications and Information Technology

kwartalni

A novel MIMO relay FM-DCSK UWB system for low-rate and low-power WPAN applications

Conference Name:11th International Symposium on Communications and Information Technologies, ISCIT 2011. Conference Address: Hangzhou, China. Time:October 12, 2011 - October 14, 2011.In this paper, we propose a novel multi-access multiple-input multiple-output (MIMO) relay frequency-modulated differential chaos shift keying (FM-DCSK) ultra-wideband (UWB) system with decode-and-forward (DF) relaying protocol, where the relay intelligently employs multiple antennas to greatly strengthen the robustness against signal fading in wireless networks. Simulation results show that the bit error rate (BER) performance of the proposed system is remarkably better than the conventional multi-access FM-DCSK UWB systems under indoor residential environments of the IEEE 802.15.4a standard by means of obtaining the spatial diversity gain. Furthermore, the influence of antenna number of relay to the proposed system is also investigated to provide a good compromise between the system performance and implementation complexity. For these advantages above, the proposed system can be seen as a viable alternative to other FM-DCSK UWB schemes for the low-rate and low-power applications in wireless personal area networks (WPAN). ? 2011 IEEE