Analysis of improved μ-law companding technique for OFDM systems

Nazar Ali, Rola Almahainy, Abdullah Al-Shabili, Nawaf Almoosa, Raed Abd-Alhameed

Research output: Contribution to journalArticlepeer-review

29 Scopus citations


High Peak-to-Average-Power Ratio (PAPR) of transmitted signals is a common problem in broadband telecommunication systems using an orthogonal frequency division multiplexing (OFDM) modulation scheme, as it increases transmitter power consumption. In consumer applications where it impacts mobile terminal battery life and infrastructure running costs, this is a major factor in customer satisfaction. Companding techniques have been recently used to alleviate this high PAPR. In this paper, a companding scheme with an offset, amidst two nonlinear companding levels, is proposed to achieve better PAPR reduction while maintaining an acceptable bit error rate (BER) level, resulting in electronic products of higher power efficiency. Study cases have included the effect of companding on the OFDM signal with and without an offset. A novel closed-form approximation for the BER of the proposed companding scheme is also presented, and its accuracy is compared against simulation results. A method for choosing best companding parameters is presented based on contour plots. Practical emulation of a real time OFDM-based system has been implemented and evaluated using a Field Programmable Gate Array (FPGA).

Original languageBritish English
Article number8013251
Pages (from-to)126-134
Number of pages9
JournalIEEE Transactions on Consumer Electronics
Issue number2
StatePublished - May 2017


  • companding
  • Field Programmable Gate Array (FPGA)
  • Orthogonal frequency division multiplexing (OFDM)
  • PAPR reduction


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