CAJ | 학술논문

研究基站具有多根天线、中继与用户具有单天线的中继放大转发多用户系统，利用正交空时分组编码和机会主义调度策略同时获得空间分集和多用户分集。针对自适应增益和固定增益转发策略，首先导出独立不同分布瑞利衰落下系统中断概率和误码率的闭合表达式；随后根据高信噪比下系统的渐近性能确定系统的分集阶数，分析空间分集和多用户分集对系统性能的联合影响，并与单跳多天线基站下行传输系统进行性能比较；最后利用计算机仿真验证理论分析结果的正确性。
연구기참구유다근천선、중계여용호구유단천선적중계방대전발다용호계통，이용정교공시분조편마화궤회주의조도책략동시획득공간분집화다용호분집。침대자괄응증익화고정증익전발책략，수선도출독립불동분포서리쇠락하계통중단개솔화오마솔적폐합표체식；수후근거고신조비하계통적점근성능학정계통적분집계수，분석공간분집화다용호분집대계통성능적연합영향，병여단도다천선기참하행전수계통진행성능비교；최후이용계산궤방진험증이론분석결과적정학성。
A multiuser Amplify-and-Forward (AF) relay system is considered in which the source is equipped with multiple antennas ,while the relay and each of multiple destinations have a single antenna .Orthogonal Space-Time Block Coding (OSTBC ) is employed to achieve spatial diversity and opportunistic scheduling is used to obtain multiuser diversity .Closed-form expressions for outage probability and average Symbol Error Rate (SER ) in independent but not identically distributed (i .n .i .d .) Rayleigh fading multiuser environments are derived for adaptive-gain and fixed-gain relaying methods .Asymptotic expressions for outage probability and average SER at high SNR are presented and used to determine the diversity order of the two relaying systems .The combined effect of spatial and multiuser diversity is quantified for the proposed system .Monte Carlo simulations demonstrate the ac-curacy of the analyses presented .Comparisons among the relaying methods and multiuser point-to-point systems are provided along with insights .