CAJ | 학술논문

该文讨论同步短波差分跳频在多址通信中的单用户与多用户检测的性能.给出了单用户检测在无背景噪声及有背景噪声的情况下,系统的比特误码率(BER)上界,并对其进行了数值仿真.其结果表明:在无背景噪声的情况下,当总用户数为2时,系统的BER可达10~(-6);若系统可以得到精确的干扰状态信息(JSI),则多址性能可以得到极大的提升.在此基础上,提出了一种迭代多用户检测算法,在迭代过程中估计各可用频率上的JSI,并利用它对多个用户进行极大似然检测,其仿真结果表明了多用户检测相对于单用户检测,其性能获得了明显的改善.
해문토론동보단파차분도빈재다지통신중적단용호여다용호검측적성능.급출료단용호검측재무배경조성급유배경조성적정황하,계통적비특오마솔(BER)상계,병대기진행료수치방진.기결과표명:재무배경조성적정황하,당총용호수위2시,계통적BER가체10~(-6);약계통가이득도정학적간우상태신식(JSI),칙다지성능가이득도겁대적제승.재차기출상,제출료일충질대다용호검측산법,재질대과정중고계각가용빈솔상적JSI,병이용타대다개용호진행겁대사연검측,기방진결과표명료다용호검측상대우단용호검측,기성능획득료명현적개선.
In this paper, theoretical analysis and simulations are performed on the performance of synchronous shortwave Differential Frequency Hopping (DFH) systems in the Multiple-Access (MA) communications. Single-user detection and multi-user detection are both considered. For single-user detection, Bit Error Rate (BER) upperbounds are derived and verified via simulation, both in the noiseless case and noise case. Results show that when the number of users is 2, the BER 10~(-6)is for the noiseless case. Furthermore, MA performance can be significantly improved if exact Jammer State Information (JSI) is available. Therefore, an iterative multi-user detection algorithm is proposed. In the iteration process, JSI of each available frequency is estimated and used to perform maximum likelihood detection for each user. Simulation results show that significant performance improvement is obtained relative to single-user detection.