EAN: 9783954890842

A DETAILED STUDY OF 4G IN WIRELESS COMMUNICATIO...

As a promising technique  OFDM has been widely used in emerging broadband communication systems
such as digital audio broadcasting (DAB)  high-definition television (HDTV)  and 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 require 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 amongst others  clipping  clipping-and-filtering (CF)  coding  companding
transform  active constellation extension (ACE)  selected mapping (SLM)  and partial transmit
sequence (PTS). This book proposes an improvement in the selected mapping technique. The
resulting scheme can also be applied to the multiple transmitting antenna cases. Further  it
compares the simulation results to the existing techniques namely exponential companding
transform  repeated clipping and filtering  and adaptive active constellation extension.

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