Berkeley ELENG 229B - Peak-to-Average Power Control in OFDM Systems (12 pages)

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Peak-to-Average Power Control in OFDM Systems



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Peak-to-Average Power Control in OFDM Systems

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Pages:
12
School:
University of California, Berkeley
Course:
Eleng 229b - Error Control Coding

Unformatted text preview:

Renaldi Winoto EE229B Project Peak to Average Power Control in OFDM Systems I Introduction High Peak to Average Power Ratio PAPR has been recognized as one of the major practical problem involving OFDM modulation High PAPR results from the nature of the modulation itself where multiple subcarriers sinusoids are added together to form the signal to be transmitted When N sinusoids add the peak magnitude would have a value of N where the rms average might be quite low due to destructive interference between the sinusoids High PAPR signals are usually undesirable for it usually strains the analog circuitry High PAPR signals would require a large range of dynamic linearity from the analog circuits which usually results in expensive devices and higher power consumption lower efficiency for example power amplifier has to operate with larger backoff to maintain linearity It s quite straightforward to observe that in an OFDM systems some input sequences would result in higher PAPR than others For example an input sequence that requires all subcarriers to transmit their maximum amplitudes would certainly result in a high output PAPR Thus by limiting the possible input sequences to a smallest subset it should be possible to obtain output signals with a guaranteed low output PAPR At the same time by limiting input sequences to a smaller subset we also provide the system with more resiliency in the presence of noise this idea is central in the area of error control codes Thus the question is can we set up a framework such that we can jointly optimize the selection of codewords based on both their PAPR and minimum distance performance In this project we will conduct a literature survey of the various techniques proposed to establish PAPR control in OFDM modulation The emphasis will certainly be on those techniques which uses codes designed to have both low PAPR along with good errorcorrection capabilities We will also briefly mention other methods that have been proposed in the



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