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In this paper, we proposed an adaptive channel estimation scheme with low implementation complexity suitable for small portable MB-OFDM UWB devices. Through the introduction of a simple adaptive filter in the frequency domain, the mean squared error (MSE) of the channel estimates and system performance improves substantially. Moreover, the proposed scheme can adapt to the different operating channel...
In this paper, a novel joint carrier and sampling frequency offset estimation scheme for multi-band orthogonal frequency division multiplexing (MB-OFDM) ultra wideband (UWB) system is introduced. We investigate the relationship between carrier and sampling frequency offset when they have a common error source and derive the joint estimation scheme. The proposed scheme consists of two stages. In the...
The Automatic Repeat Request (ARQ) scheme makes use of error detection to identify if retransmission is required. Hybrid ARQ (HARQ) uses an error control code in conjunction with ARQ and can reduce the number of transmissions required, thus giving a better goodput performance. When packet combining (PC) is carried out in the HARQ scheme, PER can be greatly improved. This paper investigates the performance...
In this paper, we introduce a novel sampling offset estimation scheme based on iterative two-dimensional estimation principle for multi-band orthogonal frequency division multiplexing (MB-OFDM) system. The proposed scheme estimates the sampling frequency offset through the phase distortion of pilot sub-carriers in each OFDM symbol and improves the accuracy by averaging the estimate from each pilot...
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