Peak-to-average power reduction in an orthogonal frequency division multiplexing system
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United States of America Patent
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Sep 27, 2005
Grant Date -
Oct 17, 2002
app pub date -
Feb 16, 2001
filing date -
Feb 16, 2001
priority date (Note) -
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status (Latency Note)
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Abstract
An Orthogonal Frequency Division Multiplexing (OFDM) transmission utilizes random phases across the OFDM sub-carrier components and differential encoding so that the phase information (i.e., phase values) does not have to be explicitly transmitted to a receiver. The OFDM data symbols are differentially encoded so that the phase information on the symbols that are multiplied together in the differential encoder is the same. Assuming use of a differential phase shift keying (DPSK) system, a phase sequence is used having 'V' random phase values, where θn,k is the phase value in the nth sub-carrier in the kth OFDM symbol and is periodic in n with V as the period. A current input symbol is then differentially encoded relative to the Vth previous encoded output from the encoder so that the phase values on the symbols multiplied together in the differential encoding process are the same.
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