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Orthogonal frequency division multiplexing (OFDM) technique has been widely adopted in wireless communication systems. However, the study of OFDM technique for optical transmission system is still emerging in the research field. In this paper, we propose a baseband receiver architecture for the optical OFDM system. The baseband receiver contains frame detection, carrier frequency offset (CFO) estimation...
In this paper, we propose an energy-efficient 128~2048/1536-point partial FFT processor for the resource block mapping in the 3GPP-LTE OFDMA system. First, we present a modified partial cached-FFT algorithm with radix-2/22/3 operations for different resource block allocation in the OFDMA system. Then, based on the proposed algorithm, we build up the architecture of radix-2/22/3 cached-FFT processor...
In this paper, we present a 128~2048-point variable-length FFT processor for 4 × 4 MIMO-OFDM systems. In general, we must use n FFT processors for the n × n MIMO-OFDM system, and only 1/r operation time is employed for radix-r pipeline butterfly processor. This increases hardware cost and reduces hardware efficiency in VLSI implementation. Therefore, we propose radix-42 algorithm to deal with four...
In the orthogonal frequency-division multiple-access (OFDMA) communication system, resource allocation plays an important role in improving the transmission performance. The maximum spectral efficiency can be achieved through channel quality measurement, resource allocation, adaptive modulation, and so on. In this brief, we design a partial cached fast Fourier transform (FFT) processor that accounts...
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