Abstract
Orthogonal frequency-division multiplexing (OFDM) is a multi carrier modulation scheme mainly used for digital communications. The performance of OFDM system heavily depends on the synchronization scheme used. In most cases, the accuracy level of synchronization will be worsened by the error caused in fixed point arithmetic involved. In this paper, we analyze the impact of the fixed point arithmetic on the performance of the coarse timing and frequency synchronization. Here with an analytical approach through numerical simulations bit length of IEEE 754 standard single precision format is optimized according to the required degree of accuracy for low complexity. Also, a complete precision level requirement for FFT computations with all possible modulation types is obtained. The proposed precision model is compared with IEEE standard single precision model and its efficiency in OFDM synchronization process is proved through MATLAB simulations. Finally, the complexity reduction of proposed precision model in both addition and subtraction is proved against single precision format using hardware synthesis. Here we proved that more than 50% complexity reduction is achieved as compared to standard precision models without compromising quality. The quality retention of proposed model is proved in both timing and frequency synchronization process.
Highlights
In recent years, floating-point computation has major impact in applications like industrial automation, imagingHow to cite this paper: Janakiraman, V. and Kannan, M. (2016) Performance Analysis of Orthogonal frequency-division multiplexing (OFDM) Synchronization Using Customized Floating Point for Low Complexity
OFDM is robust against multipath fading still it has some significant challenges due to its sensitiveness to synchronization errors; it makes the task of estimating these errors for proper synchronization
64 sub-carriers, 16-QAM modulation are used, CP is chosen as N/4 N, the simulation is based on AWGN channel, and for synchronization standard 802.11a preamble is used
Summary
In recent years, floating-point computation has major impact in applications like industrial automation, imaging. (2016) Performance Analysis of OFDM Synchronization Using Customized Floating Point for Low Complexity. Signal computing where high dynamic range is an essential. OFDM is robust against multipath fading still it has some significant challenges due to its sensitiveness to synchronization errors; it makes the task of estimating these errors for proper synchronization. In many papers, they were used pre defined binary sequences for correcting both timing and frequency offsets P. Needs of high performance applications like multimedia, wireless teleconferencing leads to use various range of data modulations like BPSK, QPSK, 16-QAM, and 64QAM were used T. The effect of arithmetic computation in synchronization and provides reasons why high precision and low complexity are desirable
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