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A novel algorithm called partial transmit sequence-active interference cancellation (PTS-AIC) is proposed to implement interference avoidance functionality in an ultra-wideband (UWB) OFDM device. It can be considered as another application of the PTS algorithm that has been applied to an OFDM transmission to reduce its peak-to-average power ratio. Specifically, PTS-AIC with adjacent subblock partitioning...
The performance of fast frequency hopping OFDM (FFH-OFDM) is evaluated under UWB channels with several types of receivers. It is shown that FFH-OFDM has a significant improvement over a conventional OFDM system. The receiver algorithms for the FFH-OFDM considered in this paper are zero-forcing (ZF), minimum mean square error (MMSE), QR- MMSE and sorted QR-MMSE (SQR-MMSE). Soft-output metric computation...
When an ultrawideband (UWB) transmitter is operating, it must not cause interference to existing primary users. Three new techniques are proposed in this paper in order to enhance the active interference cancellation (AIC), which is a technique to avoid causing the interference, for multiband-OFDM UWB transmitters. The first technique applies cyclic shifting while the second technique applies phase...
The shadowing in ultra wideband (UWB) channels may degrade the system performance significantly. Although UWB multipath channels exhibit high resolution in space and time. The large scale shadow fading were moderately correlated based on UWB indoor channel measurement. In this paper, a new modelling method for correlated shadowing with log-normal distribution in UWB multiple-input multiple-output...
In this paper, tap selection based Minimum Mean Square Error (MMSE) equalization technique is discussed for ultra wideband (UWB) systems in the presence of inter symbol interference (ISI) and multiple access interference (MAI). A novel tap selection technique based on matching pursuit (MP) algorithm is proposed. Given finite training sample support, diagonal loading (DL) technique is incorporated...
In this paper, diagonally loaded linear minimum mean square error (MMSE) equalization technique is proposed for ultra wideband (UWB) multipath channel in the presence of inter symbol interference (ISI) and multiple access interference (MAI). In the case of practical implementation under limited training sample support, the optimal solution for linear least squares problems is the minimum norm (MN)...
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