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Selective Mapping technique for PAPR reduction in LTE-OFDM Systems (Paperback)
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Selective Mapping technique for PAPR reduction in LTE-OFDM Systems (Paperback)
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Master's Thesis from the year 2012 in the subject Engineering -
Communication Technology, grade: none, - (CSIT Durg), 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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