Abstract
This paper proposes an efficient architecture and implementation of fading compensation dedicated to dynamic spectrum access (DSA) wireless communication. Since pilot subcarrier arrangements are adaptively determined in wireless communication systems with DSA, the proposed architecture employs piecewise linear interpolation to the channel response estimation for data subcarriers in order to increase the channel estimation accuracy. The fading compensation for an orthogonal frequency-division multiplexing (OFDM) symbol is performed within the time for one OFDM symbol to make increase of latency smaller. The proposed architecture guarantees real-time processing with 76 MHz or higher clock frequency. The FPGA implementation of the proposed architecture occupies 1,577 slices and works up to 121 MHz.
Highlights
In ambient information society, the ICT infrastructure interacts with each person in order to make the one’s surrounding space more comfortable
If the wireless communication is based on orthogonal frequency-division multiplexing (OFDM), known training signals called pilots are utilized in order to estimate the channel response and compensate the distortion [5]
Piecewise linear interpolation is utilized in order to estimate the channel responses for data subcarriers by using the channel responses for pilot subcarriers
Summary
The ICT infrastructure interacts with each person in order to make the one’s surrounding space more comfortable. Among them, [4] proposed dynamic subcarrier selection technique based on CSMA/CA with orthogonal frequency division multiplexing (OFDM) If the wireless communication is based on OFDM, known training signals called pilots are utilized in order to estimate the channel response and compensate the distortion [5]. 48 4 128 40 MHz 4 μs 32 samples BPSK, QPSK, 16QAM, 64QAM 1/2, 2/3, 3/4 are estimated by interpolating the channel responses of pilot subcarriers [6] It is decided adaptively which subcarriers are utilized as data subcarriers or pilot subcarriers in target wireless communication with DSA [7]. Piecewise linear interpolation is utilized in order to estimate the channel responses for data subcarriers by using the channel responses for pilot subcarriers
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