CAJ | 학술논문

针对信道相关及存在信道估计误差的垂直分层空时（Vertical bell lab layered space‐time ，V‐BLAST ）系统，提出以最小化误比特率（Bit error rate ，BER）为优化目标的自适应功率分配算法。通过系统建模和性能分析，由接收信号子流的瞬时信干噪比（Signal‐to‐interference‐plus‐noise ratio ，SINR），推导出系统子流的平均BER闭式表达式。发送端在总功率约束条件下，以瞬时BER为优化目标，利用拉格朗日极值法得到自适应功率分配矩阵。仿真结果表明，信道相关及估计误差对V‐BLAST 系统的BER性能有极大影响，采用所提算法可显著改善系统的BER性能并更具实用性。
침대신도상관급존재신도고계오차적수직분층공시（Vertical bell lab layered space‐time ，V‐BLAST ）계통，제출이최소화오비특솔（Bit error rate ，BER）위우화목표적자괄응공솔분배산법。통과계통건모화성능분석，유접수신호자류적순시신간조비（Signal‐to‐interference‐plus‐noise ratio ，SINR），추도출계통자류적평균BER폐식표체식。발송단재총공솔약속조건하，이순시BER위우화목표，이용랍격랑일겁치법득도자괄응공솔분배구진。방진결과표명，신도상관급고계오차대V‐BLAST 계통적BER성능유겁대영향，채용소제산법가현저개선계통적BER성능병경구실용성。
An adaptive transmit power allocation (TPA) scheme to minimize bit error rate (BER) is in‐vestigated in a vertical bell labs layered space‐time (V‐BLAST ) system with channel correlation and esti‐mation error .The closed expression for average BER can be derived according to the instantaneous sig‐nal‐to‐interference‐plus‐noise ratio (SINR) of each sub‐stream by system modeling and performance anal‐ysis .At the transmitter ,with the total TPA constraint condition ,TPA matrix is calculated through the Lagrange multiplier method .Numerical results demonstrate that the correlation structure and channel estimation error have a profound effect on the performance of V‐BLAST system .The proposed TPA scheme can improve the BER performance effectively and be practical for the actual communication sys‐tem .