Adaptive raised-cosine channel interpolation for pilot-aided OFDM systems

Abstract

In this paper, we first show equivalence of OFDM channel estimation using time-domain windowing and using frequency-domain interpolation. Based on this equivalence, a new frequency-domain channel interpolator featuring the advantage of time-domain channel impulse response windowing is proposed. Furthermore, the proposed raised-cosine channel interpolator can adaptively adjust its coefficients to accommodate various channel power delay profiles. Both theoretical and simulation results verify that the proposed interpolator achieves more accurate channel estimation performance than other existing solutions.Index Terms-Orthogonal frequency division multiplex, interpolation, pilot-based, channel estimation.

An energy-efficient communication system using joint beamforming in multi-hop health monitoring sensor networks

“…3a. The preamble design facilitates OFDM symbol timing synchronization, carrier frequency offset (CFO) recovery, and channel estimation, which were all discussed in detail in our previous works [13][14][15]. According to different functions, the preamble can be further classified into three parts.…”

“…This part is also responsible for the channel estimation and the demodulation and decoding of the received data. Taking advantage of the scattered pilots contained in preamble 3 of the neighborhood discovery packets, accurate channel state information (CSI) can be acquired using the shifted raised cosine interpolator [14]. The CSI is then used to calculate the receive beamforming vector by the maximum ratio combining method.…”