通信技术
通信技術
통신기술
COMMUNICATIONS TECHNOLOGY
2013年
5期
111-114
,共4页
数字预失真%查找表%RLS_DCD%计算复杂度
數字預失真%查找錶%RLS_DCD%計算複雜度
수자예실진%사조표%RLS_DCD%계산복잡도
digtial predistortion%look-up table%RLS_DCD%computational complexity
在间接学习结构的数字预失真技术中,需要使用自适应算法来更新查找表(LUT, Look Up Table).在各种自适应算法中,RLS算法收敛快但是复杂度高.为降低其计算复杂度,这里提出采用二维坐标下降的 RLS(RLS_DCD,RLS using Dichotomous Coordinate Descent)算法更新查找表,达到在数字预失真器系数的预测过程中以较低的运算量实现快速收敛的目的.仿真结果和分析表明,与采用 RLS 的自适应查找表更新算法比较,在邻信道功率比(ACPR,Adjacent Channel Power Ratio)改善指标相当的情况下,采用RLS_DCD的自适应查找表更新算法能大幅度降低其运算量.
在間接學習結構的數字預失真技術中,需要使用自適應算法來更新查找錶(LUT, Look Up Table).在各種自適應算法中,RLS算法收斂快但是複雜度高.為降低其計算複雜度,這裏提齣採用二維坐標下降的 RLS(RLS_DCD,RLS using Dichotomous Coordinate Descent)算法更新查找錶,達到在數字預失真器繫數的預測過程中以較低的運算量實現快速收斂的目的.倣真結果和分析錶明,與採用 RLS 的自適應查找錶更新算法比較,在鄰信道功率比(ACPR,Adjacent Channel Power Ratio)改善指標相噹的情況下,採用RLS_DCD的自適應查找錶更新算法能大幅度降低其運算量.
재간접학습결구적수자예실진기술중,수요사용자괄응산법래경신사조표(LUT, Look Up Table).재각충자괄응산법중,RLS산법수렴쾌단시복잡도고.위강저기계산복잡도,저리제출채용이유좌표하강적 RLS(RLS_DCD,RLS using Dichotomous Coordinate Descent)산법경신사조표,체도재수자예실진기계수적예측과정중이교저적운산량실현쾌속수렴적목적.방진결과화분석표명,여채용 RLS 적자괄응사조표경신산법비교,재린신도공솔비(ACPR,Adjacent Channel Power Ratio)개선지표상당적정황하,채용RLS_DCD적자괄응사조표경신산법능대폭도강저기운산량.
@@@@For the digital predistortion technology of indirect learning structure an adaptive algorithm is adopted to update the look-up table. Among those adaptive algorithms, RLS algorithm is fast in convergence but complex in computing. To reduce this computational complexity, RLS_DCD (RLS using dichotomous coordinate descent) algorithm for look-up table update is proposed, thus realizing fast convergence with fairly low computational complexity in the prediction of predistortion coefficients. Simulation and analysis results indicate that as compared with RLS-based look-up table update algorithm, the proposed algorithm could greatly reduce the computational complexity under the same condition of improved ACPR (Adjacent Channel Power Ratio).
