系统工程与电子技术
繫統工程與電子技術
계통공정여전자기술
SYSTEMS ENGINEERING AND ELECTRONICS
2014年
4期
758-763
,共6页
多输入多输出系统%Turbo频域均衡%变分推理%全后验信息反馈%非线性压扩变换
多輸入多輸齣繫統%Turbo頻域均衡%變分推理%全後驗信息反饋%非線性壓擴變換
다수입다수출계통%Turbo빈역균형%변분추리%전후험신식반궤%비선성압확변환
multiple-input multiple-output (MIMO)system%Turbo frequency domain equalization (TFDE)%variational inference%full a posteriori information feedback%nonlinear companding-based transformation
针对循环前缀（cyclic prefix，CP）编码单载波（single carrier，SC）空间复用多输入多输出（multiple-input multiple-output，MIMO）系统，基于变分推理，本文提出一种新的低复杂度压扩变换 Turbo 频域均衡（Turbo frequency domain equalization，TFDE）算法。相对于传统的 TFDE 算法，文中算法有两点明显不同，一是采用解码器压扩后验信息，计算软输入软输出（soft-in soft-out，SISO）频域均衡器（frequency domain equalizer，FDE）的数据先验均值和方差矩阵，二是采用 SISO FDE 外部数据均值、方差以及解码器压扩外信息，计算解码器先验信息。分析和仿真结果表明，这种新的 TFDE 算法在误码率（bit error rate，BER）性能、迭代收敛速度和总体计算复杂度方面均优于传统的 MIMO TFDE 算法。
針對循環前綴（cyclic prefix，CP）編碼單載波（single carrier，SC）空間複用多輸入多輸齣（multiple-input multiple-output，MIMO）繫統，基于變分推理，本文提齣一種新的低複雜度壓擴變換 Turbo 頻域均衡（Turbo frequency domain equalization，TFDE）算法。相對于傳統的 TFDE 算法，文中算法有兩點明顯不同，一是採用解碼器壓擴後驗信息，計算軟輸入軟輸齣（soft-in soft-out，SISO）頻域均衡器（frequency domain equalizer，FDE）的數據先驗均值和方差矩陣，二是採用 SISO FDE 外部數據均值、方差以及解碼器壓擴外信息，計算解碼器先驗信息。分析和倣真結果錶明，這種新的 TFDE 算法在誤碼率（bit error rate，BER）性能、迭代收斂速度和總體計算複雜度方麵均優于傳統的 MIMO TFDE 算法。
침대순배전철（cyclic prefix，CP）편마단재파（single carrier，SC）공간복용다수입다수출（multiple-input multiple-output，MIMO）계통，기우변분추리，본문제출일충신적저복잡도압확변환 Turbo 빈역균형（Turbo frequency domain equalization，TFDE）산법。상대우전통적 TFDE 산법，문중산법유량점명현불동，일시채용해마기압확후험신식，계산연수입연수출（soft-in soft-out，SISO）빈역균형기（frequency domain equalizer，FDE）적수거선험균치화방차구진，이시채용 SISO FDE 외부수거균치、방차이급해마기압확외신식，계산해마기선험신식。분석화방진결과표명，저충신적 TFDE 산법재오마솔（bit error rate，BER）성능、질대수렴속도화총체계산복잡도방면균우우전통적 MIMO TFDE 산법。
A new low complexity Turbo frequency equalization (TFDE)scheme with companding-based transformation is proposed for cyclic prefix (CP)single carrier (SC)spatial multiplexing multiple-input multi-ple-output (MIMO)systems based on the variational inference method.Compared to the traditional TFDE method for MIMO systems,the proposed scheme has two distinct features.First,the a priori mean and vari-ance matrix of the transmitted data symbols are computed with the companding a posteriori information from the decoder within the soft-in soft-out (SISO)frequency domain equalizer (FDE).Second,the a priori information for decoding is calculated by the extrinsic mean and variance of data symbols gleaned from the SISO FDE and the companding extrinsic information coming from the decoder.Analysis and simulation results demonstrate that the proposed scheme outperforms the traditional MIMO TFDE algorithm in terms of bit error rate (BER)per-formance,convergence speed of iteration and the global computational complexity.
