Certain investigations on cfo fault reduction and power allocation for wireless orthogonal frequency Division Multiplexing

Abstract

Fourth generation (4G) and beyond fourth generation wireless newlinecommunication systems are aiming for higher data rates, enhanced spectral newlineefficiency and increased mobility requirements than those provided by the newlineexisting Third Generation 3G networks. The major challenges of 4G and future newlinewireless communications are the detrimental effects of wireless radio channel newlinesuch as fading and Doppler. Multicarrier modulation such as Orthogonal newlineFrequency Division Multiplexing (OFDM) is a powerful technique to handle newlineimpairments specific to the wireless radio channel and it provides a feasible newlinephysical layer technology. The oscillator imperfections of an OFDM transceiver newlinefront-end and Doppler frequency of the wireless channel can cause frequency newlinesynchronization errors. The multipath fading and noise in a wireless channel can newlinecause timing synchronization errors. Unlike the single-carrier transmission, newlinemulti-carrier transmissions are extremely sensitive to Carrier Frequency Offsets newline(CFO) and timing offsets. Since it can deliver high data rates with adequate newlinetolerance to radio channel defects and because of its durability versus multipath newlinedelay spread, especially for mobile systems using broadband wireless newlinecommunication, OFDM has traditionally been the method of choice. Carrier newlineFrequency Offset (CFO) has nonetheless been acknowledged as an important newlineOFDM problem. To overcome this drawback, two modules have been proposed. newlineIn the first module, the feasible and elegant Fuzzy Linear CFO (FLCFO)- newlinebased resource allocation has been proposed. FL-CFO estimates the CFO newlinemore precisely while simultaneously allocating resources efficiently to newlinemaximize the use of dynamic resources. The proposed Fuzzy linear CFO newlineestimation (FL-CFO) not only estimates the CFO with greater precision but also newlineeffectively allocates resources by allowing the most efficient use of dynamic newlineresources. To obtain accurate CFO, the FL-CFO error estimate algorithm is used newlinein OFDM systems with 1-bit Quadrate errors ADC (1-bit QE ADC). The newlinefindings show that the proposed tec