Performance Analysis of MT-CDMA System with Antenna Array in a Multipath Fading Channel

In this paper, we propose a multitone code-division multiple-access (MT-CDMA) system employing antenna array at base station with quaternary phase shift keying modulation (QPSK) modulation. Based on the detailed analysis of interference characteristics the BER performance of the proposed MT-CDMA system is provided. With regard to spatial domain combining, the optimum and suboptimum combining weight is derived while the suboptimum set of weights is simplified on sense of that only the knowledge of array vector of desired user alone is sufficient for the optimum combining. Simulation results verify the analysis and show that better performance is achieved for the proposed antenna array system than single antenna MT-CDMA approach.     

汉明码在多载波CDMA系统中的应用

本文讨论了GMC-CDMA技术。GMC-CDMA提供了全数字、统一的结构，包含了单载波和多载波CDMA系统。然后，本文用信道编码对GMC-CDMA技术改进，采用在GMC-CDMA系统前先进行蝙码采确保低误码率。仿真结果会表明：经过编码后的系统能取得更低的误码率。图像在编码的GMC-CDMA和未编码的GMC—CDMA两个系统中的不同传输效果进一步验证了这一结论。