Selective Mapping technique for PAPR reduction in LTE-OFDM Systems
Master's Thesis from the year 2012 in the subject Engineering - Communication Technology, grade: none, , course: M.Tech, language: English, abstract: As a promising technique, OFDM has been widely used in emerging broadband communication systems, such as digital audio broadcasting (DAB), high-definition television (HDTV), wireless local area network (IEEE 802.11a and HIPERLAN/2). However, as the OFDM signals are the sum of signals with random amplitude and phase, they are likely to have large PAPR that requires a linear high-power- amplifier (HPA) with an extremely high dynamic range, which is expensive and inefficient. Furthermore, any amplifier nonlinearity causes intermodulation products resulting in unwanted out-of-band power. A number of approaches have been proposed to deal with the PAPR problem, including clipping, clipping-and-filtering (CF), coding, companding transform, active constellation extension (ACE), selected mapping (SLM), partial transmit sequence (PTS), and so on. This thesis proposes an improvement in Selected Mapping technique and Simulation results are compared to existing techniques namely Exponential Companding Transform, Repeated Clipping and Filtering and Adaptive Active Constellation Extension. The improvements which are proposed in classical Selective Mapping technique satisfies the PAPR Reduction criteria with reducing the computational complexity. Also this new scheme has an important advantage of avoiding the extra bits along with the transmitted OFDM signal .This scheme can also be applied to the multiple transmitting antenna cases.
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Active Constellation Extension Adaptive Active Constellation Average Power Ratio AWGN bandwidth BER plot Bit Error Rate CCDF CCDF plot channel Clipping and Filtering clipping level Clipping-Based Active Constellation coding companding scheme Complimentary Cumulative Distribution Constellation Extension CB-ACE Cumulative Distribution Function cyclic prefix data block delay spread Discrete Fourier Transform Distribution Function CCDF Division Multiple Access Division Multiplexing OFDM downlink Error Rate BER Exponential Companding Transform FDMA Figure Frequency Division Multiplexing frequency domain high PAPR IEEE increase interference Interleaving large number linear multicarrier multipath noise number of subcarriers OFDM symbol OFDM system OFDMA original OFDM signal Orthogonal Frequency Division PAPR reduction techniques Peak-to-Average Power Ratio power amplifier Power Ratio PAPR Quadrature Amplitude Modulation reduce PAPR reduce the PAPR reduce the Peak-to-Average repeated clipping Riemann Matrix SC-FDMA Selective Mapping SLM side information SLM technique spectrum subcarriers target clipping ratio transmission transmitted signal uplink WiMAX