BER Performance For OFDM Using Non-Conventional Transform and Non-Conventional Mapping Schemes
نویسندگان
چکیده
In this paper, the Bit Error Rate (BER), performance of conventional Discrete Fourier Transform (FFT) OFDM system is compared with Nonconventional Discrete Cosine Transform (DCT)OFDM system in AWGN and Rayleigh fading environment. Performance has been given with conventional mapping schemes like BPSK, QPSK and nonconventional mapping schemes like DQPSK and π/4 DQPSK. Simulation results show that DCT based schemes gives better error performance in comparison of FFT based schemes. Further DCT based technique using nonconventional mapping schemes outperforms the conventional mapping schemes for the same DCT based technique. Keywords— Biterror rate (BER), Discrete Cosine Transform (DCT), Fast Fourier Transform (FFT), Orthogonal Frequency Division Multiplexing (OFDM), Multicarrier Modulation (MCM).
منابع مشابه
Using WPT as a New Method Instead of FFT for Improving the Performance of OFDM Modulation
Orthogonal frequency division multiplexing (OFDM) is used in order to provide immunity against very hostile multipath channels in many modern communication systems.. The OFDM technique divides the total available frequency bandwidth into several narrow bands. In conventional OFDM, FFT algorithm is used to provide orthogonal subcarriers. Intersymbol interference (ISI) and intercarrier interferen...
متن کاملEmpirical Mode Decomposition based Adaptive Filtering for Orthogonal Frequency Division Multiplexing Channel Estimation
This paper presents an empirical mode decomposition (EMD) based adaptive filter (AF) for channel estimation in OFDM system. In this method, length of channel impulse response (CIR) is first approximated using Akaike information criterion (AIC). Then, CIR is estimated using adaptive filter with EMD decomposed IMF of the received OFDM symbol. The correlation and kurtosis measures are used to sel...
متن کاملEstimation in OFDM Based Cognitive Radio Systems BER Analysis for Fourier and Wavelet Transform Process
In this correspondence, sparse channel estimation is first introduced in orthogonal frequency-division multiplexing (OFDM)-based cognitive radio systems. Based on the results of spectrum sensing, the pilot design is studied by minimizing the coherence of the dictionary matrix used for sparse recovery. Then, it is formulated as an optimal column selection problem where a table is generated and t...
متن کاملQuadrilateral Companding Transform for Papr Reduction in Ofdm Systems
As discussed in chapter 3, the time domain OFDM signal has large envelope fluctuation; therefore, PAPR of OFDM signal is very high. Thus HPAs with large linear range and high resolution ADCs/DACs are required to amplify the OFDM signal, and for its conversion between analog and digital domains respectively. Many companding schemes [27]-[33] have been proposed in the literature to reduce the PAP...
متن کاملA New Low-Complexity Selected Mapping Scheme Using Cyclic Shifted IFFT for PAPR Reduction in OFDM Systems
In this paper, a new peak-to-average power ratio (PAPR) reduction scheme for orthogonal frequency division multiplexing (OFDM) is proposed based on the selected mapping (SLM) scheme. The proposed SLM scheme generates alternative OFDM signal sequences by cyclically shifting the connections in each subblock at an intermediate stage of inverse fast Fourier transform (IFFT). Compared with the conve...
متن کامل