Reducing the peak to average ratio of multicarrier GSM and edge signals

Receiver Front-End Architectures – Analysis and Evaluation

“…The increase in PAPR in multi-carrier systems becomes so complex that all the possible schemes for its minimization have become a goal for wireless system design engineers. The approaches for that minimization spans from special coding for PAPR minimization (Han & Lee, 2005), tone reservation (Tellado & Cioffi, 1998), tone injection (Han et al, 2006), clipping followed by filtering (Vaananen et al, 2002), change of the constellation diagram (Krongold & Jones, 2003), and others based on representation of the signals to transmit (Han & Lee, 2003), like partial transmit sequences (PTS) interleaving or selected mapping (SLM). Recently, the study has been centred not on how to minimize the PAPR exclusively, but on how to have a balance, on the minimum PAPR, transmission-rate and bit-error-rate (BER) optimization.…”

“…The method is very simple to implement, and the receiver could ignore the symbols carried on the unused tones, without any complex demodulation process, neither extra tail bits. Other simple but important technique is known as Amplitude Clipping plus Filtering (Vaananen et al, 2002), which is obviously the one that can achieve improved results and is less complex to apply. Nevertheless the clipping increases the occupied bandwidth and simultaneously degrades significantly the in-band distortion, giving rise to the increase of BER, due to its nonlinearity nature.…”

Design of encrypted OFDM system based on DFT-s-OFDM in FPGA

“…However, high peak to average power ratio(PAPR) has been one of major problems in OFDM modulation because of accumulation of multiple subcarriers. Higher PAPR means that the power amplifier must be able to work in a wider/broad linear range to avoid nonlinear distortion and degradation of transmission performance [1]. In recent years, some methods has been proposed in order to handle the high PAPR problem of OFDM modulation, such as clipping, partial transmit sequence(PTS), selected mapping(SLM).…”

Hardware Accelerated Simulation of Crest Factor Reduction Block for Mobile Telecommunications

“…RELATED WORK Since multicarrier transmissions and non-constant envelope modulations become popular in mobile networks a number of papers and technical solutions were proposed to efficiently combine them and reduce PAR. One of the early paper by Väänänen et al [2] focused on GSM and EDGE signals and analysed different windowing methods and algorithms to prevent signal over clipping. In [3] the same authors presented that CFR can be successfully applied to GSM and WCDMA carriers.…”