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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...
Ultra-wideband (UWB) impulse radio systems based on non-coherent on-off keying (OOK) energy detection are relatively simpler to implement than their coherent counterparts, because the strict synchronization requirements are relaxed. However, the design challenge is to set a hard decision threshold value after energy detection because the detected energy may vary due to multipath fading and inter-pulse...
IEEE 802.15.4a task group is defining an ultra low power consumption and low cost radio for wireless personal area networks (WPANs) applications using ultra-wideband (UWB) technology with high precision ranging capability. Ternary preamble sequences of two different lengths have been proposed and adopted in the IEEE 802.15.4a specification for ranging. In order for a IEEE 802.15.4a low cost UWB device...
IEEE 802.15.4a task group is defining an ultra low power consumption and low cost radio for wireless personal area networks (WPANs) applications using ultra-wideband (UWB) technology with high precision ranging capability. Ternary preamble sequences of two different lengths have been proposed and adopted in the IEEE 802.15.4a specification for ranging. In order for a IEEE 802.15.4a low cost UWB device...
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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