SC-FDMA技术及其在3GPP LTE中的应用

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资源摘要信息:"本资源提供了关于Single Carrier FDMA(SC-FDMA)在MATLAB环境下的仿真程序。SC-FDMA是一种在3GPP LTE标准中提出的上行传输技术,被设计用来降低传输信号的峰值平均功率比(PAPR),从而优化无线通信系统中的功耗和设备成本。与OFDM技术相比,SC-FDMA具有较低的PAPR,这是因为SC-FDMA在传输前对信号进行了离散傅里叶变换(DFT)扩展,因此也被称作DFT-Spread-OFDM。 程序集包含了多种基于频率分集的传输方案,其中包括OFDMA(正交频分多址)、SC-FDE(单载波频域均衡)以及SC-FDMA。在接收端处理上,程序集使用了两种经典的检测算法,即零强迫(ZF)和最小均方误差(MMSE)算法。这两种算法在信号处理领域广泛使用,特别是对于提高多输入多输出(MIMO)通信系统的性能至关重要。 SC-FDMA技术因其较低的PAPR特性,在上行链路中特别受到青睐,有助于提升功率放大器的效率,延长电池的使用寿命,并减少发射机的复杂性。SC-FDMA的这些优点使得它成为未来移动通信中一种非常有前景的技术。 在3GPP LTE标准中,SC-FDMA已经被用作上行链路传输的技术之一,而OFDMA则主要应用于下行链路。因此,这份资源能够帮助研究者和工程师更加深入地理解这两种技术的原理和应用,特别是在频率分集技术方面的进展。 资源中的压缩文件包含文本文件和MATLAB脚本文件。文本文件可能包含有关资源的详细说明、安装指南和使用示例。而MATLAB脚本文件则包含了具体的SC-FDMA、OFDMA和SC-FDE实现代码,这些代码可直接用于仿真和分析,有助于用户验证算法性能和学习通信系统的原理。 此外,标签中提及的'mmse_ofdm'、'ofdma_功率'、'very_low_frequency'和'ofdm频域均衡',指向了资源核心关注的技术点。MMSE检测算法的使用表明,资源也关注于降低多径效应带来的干扰问题,以达到更好的接收效果。'Very low frequency'可能指出资源也涉及到了在低频波段上的应用与性能研究。而'频域均衡'则是SC-FDE和OFDM技术中处理频率选择性衰落问题的关键技术之一。 总的来说,这份资源为研究和学习通信系统中的频域技术提供了宝贵的仿真工具和详尽的分析材料,特别是在功率效率和频域均衡这两个关键性能指标上。"

SELECT PIS.SHOW_FLT_DETAIL AS SHOW_FLT_DETAIL -- new , PIS.SHOW_AWB_DETAIL AS SHOW_AWB_DETAIL -- new , PIS.DISPLAY_AIRLINE_CODE AS CARRIER_CODE , DECODE(PIS.REVERT_FLOW,'N',PIS.FLOW_TYPE,DECODE(PIS.FLOW_TYPE,'I','E','I')) AS FLOW_TYPE , PIS.SHIP_TO_LOCATION AS SHIP_TO_LOCATION , PIS.INVOICE_SEQUENCE AS INVOICE_SEQUENCE , PFT.FLIGHT_DATE AS FLIGHT_DATE , PFT.FLIGHT_CARRIER_CODE AS FLIGHT_CARRIER_CODE , PFT.FLIGHT_SERIAL_NUMBER AS FLIGHT_SERIAL_NUMBER , PFT.FLOW_TYPE AS AIRCRAFT_FLOW , FAST.AIRCRAFT_SERVICE_TYPE AS AIRCRAFT_SERVICE_TYPE , PPT.AWB_NUMBER AS AWB_NUMBER , PPT.WEIGHT AS WEIGHT , PPT.CARGO_HANDLING_OPERATOR AS CARGO_HANDLING_OPERATOR , PPT.SHIPMENT_PACKING_TYPE AS SHIPMENT_PACKING_TYPE , PPT.SHIPMENT_FLOW_TYPE AS SHIPMENT_FLOW_TYPE , PPT.SHIPMENT_BUILD_TYPE AS SHIPMENT_BUILD_TYPE , PPT.SHIPMENT_CARGO_TYPE AS SHIPMENT_CARGO_TYPE , PPT.REVENUE_TYPE AS REVENUE_TYPE , PFT.JV_FLIGHT_CARRIER_CODE AS JV_FLIGHT_CARRIER_CODE , PPT.PORT_TONNAGE_UID AS PORT_TONNAGE_UID , PPT.AWB_UID AS AWB_UID , PIS.INVOICE_SEPARATION_UID AS INVOICE_SEPARATION_UID , PFT.FLIGHT_TONNAGE_UID AS FLIGHT_TONNAGE_UID FROM PN_FLT_TONNAGES PFT , FZ_AIRLINES FA , PN_TONNAGE_FLT_PORTS PTFP , PN_PORT_TONNAGES PPT , FF_AIRCRAFT_SERVICE_TYPES FAST , SR_PN_INVOICE_SEPARATIONS PIS --new , SR_PN_INVOICE_SEP_DETAILS PISD--new , SR_PN_INV_SEP_PORT_TONNAGES PISPT --new WHERE PFT.FLIGHT_OPERATION_DATE >= trunc( CASE :rundate WHEN TO_DATE('01/01/1900', 'DD/MM/YYYY') THEN ADD_MONTHS(SYSDATE,-1) ELSE ADD_MONTHS(:rundate,-1) END, 'MON') AND PFT.FLIGHT_OPERATION_DATE < trunc( CASE :rundate WHEN TO_DATE('01/01/1900', 'DD/MM/YYYY') THEN TRUNC(SYSDATE) ELSE TRUNC(:rundate) END, 'MON') AND PFT.TYPE IN ('C', 'F') AND PFT.RECORD_TYPE = 'M' AND (PFT.TERMINAL_OPERATOR NOT IN ('X', 'A') OR (PFT.TERMINAL_OPERATOR <> 'X' AND FA.CARRIER_CODE IN (SELECT * FROM SPECIAL_HANDLING_AIRLINE) AND PPT.REVENUE_TYPE IN (SELECT * FROM SPECIAL_REVENUE_TYPE) AND PPT.SHIPMENT_FLOW_TYPE IN (SELECT * FROM SPECIAL_SHIPMENT_FLOW_TYPE) AND PFT.FLIGHT_OPERATION_DATE >= (select EFF_DATE from SPECIAL_HANDLING_EFF_DATE) )) AND PFT.DELETING_DATETIME IS NULL AND FA.AIRLINE_UID = PFT.AIRLINE_UID AND FA.DELETING_DATETIME IS NULL AND PTFP.FLIGHT_TONNAGE_UID = PFT.FLIGHT_TONNAGE_UID AND PTFP.RECORD_TYPE = 'M' AND PTFP.DELETING_DATETIME IS NULL AND PPT.TONNAGE_FLIGHT_PORT_UID (+)= PTFP.TONNAGE_FLIGHT_PORT_UID AND PPT.RECORD_TYPE (+)= 'M' AND PPT.DISCREPANCY_TYPE (+)= 'NONE' AND PPT.ADJUSTMENT_INC_FLAG (+)= 'Y' AND PPT.DELETING_DATETIME (+) IS NULL AND FAST.AIRCRAFT_SERVICE_TYPE_UID = PFT.AIRCRAFT_SERVICE_TYPE_UID AND FAST.DELETING_DATETIME IS NULL AND PIS.TEMPORAL_NAME = TO_CHAR((CASE :rundate --new WHEN TO_DATE('01/01/1900', 'DD/MM/YYYY') THEN TRUNC(SYSDATE) ELSE TRUNC(:rundate) END ), 'YYYYMM') || '00' AND PIS.INVOICE_SEPARATION_UID = PISD.INVOICE_SEPARATION_UID --new AND PISD.INVOICE_SEP_DETAIL_UID = PISPT.INVOICE_SEP_DETAIL_UID --new AND PISPT.PORT_TONNAGE_UID = PPT.PORT_TONNAGE_UID --new AND PIS.PRINT_SUPPORTING_DOC = 'Y';上面是oracle的写法,请转成spark SQL的写法。

2023-06-02 上传