نتایج جستجو برای: papr
تعداد نتایج: 1538 فیلتر نتایج به سال:
the destructive impact of fading environments and also bandwidth limitations are two main challenges which communication is dealing with them. these challenges can affect on the growth of wireless communication and even cause reliable communications and high data rate to be prevented. thus, ofdm (orthogonal frequency division multiplexing) modulation by using of fast calculation hardwares such ...
Tone Reservation (TR) is one of the well-known methods for PAPR reduction of Orthogonal Frequency Division Multiplexing (OFDM) systems. In this method some sub-carriers are reserved for PAPR reduction and the symbols in these sub-carriers are selected such that the PAPR of the OFDM frame is minimized. In this paper, the iterative algorithm introduced earlier for TR method in single antenna OFDM...
OFDM and its extension Multi-band OFDM (MB-OFDM) are considered as the modulation schemes for many future communications systems. But these schemes cause high PAPR which should be reduced before power amplification otherwise non-linearities can occur. In this paper Tone Reservation method is used for OFDM PAPR reduction where a corrective signal is added to the original signal to reduce its PAP...
The high Peak to Average Power Ratio (PAPR) of Orthogonal Frequency Division Multiplexing (OFDM) and MIMO-OFDM systems reduces the system efficiency. In this paper, an extension of Tone Reservation (TR) method is introduced for PAPR reduction in Space Frequency Block Coded OFDM (SFBC-OFDM) systems. The proposed algorithm is based on a time domain kernel which is added to the signal of the anten...
Nonlinear PAPR reducers, such as clipping and companding techniques, are some simple methods used to reduce the Peak-to-Average Power Ratio (PAPR). In this paper, assuming that the baseband OFDM signal is characterized as a band-limited complex Gaussian process, we investigate the PAPR distribution of an OFDM signal when it is passed through a nonlinear PAPR reducer. The obtained PAPR distribut...
The 3rd generation partnership project (3GPP) long term evolution (LTE) standard uses single carrier frequency division multiple access (SCFDMA), scheme for the uplink transmissions and orthogonal frequency division multiplexing access (OFDMA) in downlink. SCFDMA makes use of single carrier modulation and frequency domain equalization, it is a technique that has similar performance and essentia...
The 3rd generation partnership project (3GPP) long term evolution (LTE) standard uses single carrier frequency division multiple access (SCFDMA), scheme for the uplink transmissions and orthogonal frequency division multiplexing access (OFDMA) in downlink. SCFDMA makes use of single carrier modulation and frequency domain equalization, it is a technique that has similar performance and essentia...
نسبت توان اوج به متوسط (PAPR) بالا یک عیب مهم سامانه MIMO-OFDM شناخته می‌شود. PAPR بالا در فرستنده ممکن است تقویت‌کننده را به اشباع ببرد و به اعوجاج غیرخطی به دلیل عناصر غیرخطی بیانجامد. همچنین می‌تواند پیچیدگی مبدل‌های دیجیتال به آنالوگ را افزایش دهد. این مقاله یک روش کاهش PAPR برای سامانه MIMO-OFDM پیشنهاد می‌کند. ایده اصلی، تولید چندین سیگنال نامزد حاوی اطلاعات یکسان و ارسال سیگنال دارای کمت...
It is the fact that OFDM signals face the problem of high PAPR. In literatures, many PAPR reduction techniques were proposed to encounter such a problem. Those works pronounce the success of using PAPR reduction technique based on AWGN channel. However, the real propagation channels are more diverse than only AWGN, especially for indoor environments. In this paper, the performances of OFDM sign...
This paper proposes the assignment of resource blocks (RBs) to reduce the peak-to-average power ratio (PAPR) of orthogonal frequency division multiplexing (OFDM) in a multi-user OFDM system. This system ranks the users according to the channel state information (CSI) for RB assignment. In our proposed technique, an RB is assigned to either the firstor second-ranked mobile station (MS) to minimi...
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