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In this paper, we propose adaptive equalizer and phase noise compensator in order to effectively cancel feedback channel and phase noise in wireless repeater system based on LTE-Advanced uplink system. In a repeater system, the performance got worse caused by feedback channel and phase noise. In order to cancel feedback channel, we use adaptive equalizer such as NLMS and RLS. And block type pilot...
OFDM (orthogonal frequency division multiplexing) system is very promising for the 4th generation mobile communication because of high data rate. However, OFDM system has a serious problem of high PAPR (peak to average power ratio) that occurs in case so many subcarriers line up in the same phase. This signal is distorted through the nonlinear HPA. BER performance of this distorted signal becomes...
Orthogonal frequency division multiplexing (OFDM) has been used widely in many communication systems. However, the major drawback of OFDM is the high peak-to-average-power ratio (PAPR) which results in the bit error rate (BER) performance degradation in nonlinear environments. In this paper, we introduce a new phase weighting method to reduce the nonlinear distortion of OFDM signals in the nonlinear...
In this paper, we propose a novel PAPR (peak to average power ratio) reduction method using WHT (Walsh Hadamard transform) to lower the high PAPR of OFDM (orthogonal frequency division multiplexing) system. The merit of this proposed method is efficient PAPR reduction performance as well as no loss of bandwidth efficiency. Furthermore, the PAPR reduction process can be made in the realtime although...
OFDM (orthogonal frequency division multiplexing) communication is very attractive for high data rate transmission especially in the frequency selective fading channel. However, OFDM signal may be distorted by the nonlinear HPA (high power amplifier) since it has very high PAPR (peak-to-average power ratio). The proposed method is basically similar to the conventional SLM (selective mapping) method...
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