Modeling of multiple access interference and BER derivation for TH and DS UWB multiple access systems

A novel analytical method is introduced for exact statistical modeling of multiple access interference (MAI), in time hopping pulse position modulation and pulse amplitude modulation (TH-PPM and TH-PAM) ultra wideband (UWB) systems operating in additive white Gaussian noise (AWGN) channels. Based on this method, exact bit error rates (BER) are expressed in simple formulas. In a similar fashion, the exact BER of direct sequence (DS) UWB is also derived for PAM modulation. The proposed modeling of MAI considers complete asynchronism in user access, and is also suitable for accurately Modeling the MAI components contributed by individual paths in channels with Poisson arrivals, based on the time variables. We further extend this method to derive general expressions for the BER performance in log-normal fading multi-path channels. In the course of, these derivations, we also introduce a more accurate numerical approach to evaluate the characteristic function (CF) of a lognormal random variable.</p

Modeling of multiple access interference and ser derivation for M-ary TH- PAM /PPM UWB systems

IEEE Vehicular Technology Conference6132008-2012IVTC

Exact modeling of multiple access interference and BER derivation for TH-PPM UWB

IEEE Wireless Communications and Networking Conference, WCNC2801-80

A new analytical method for exact bit error rate computation of TH-PPM UWB multiple access systems

IEEE International Symposium on Personal, Indoor and Mobile Radio Communications, PIMRC42968-297

Modeling of multiple access interference and BER derivation for TH and DS UWB multiple access systems

10.1109/TWC.2006.04530IEEE Transactions on Wireless Communications5102794-280

Delay tuning based transmit diversity scheme for TH-PPM UWB: Performance with RAKE reception and comparison with multi RX schemes

2004 International Workshop on Ultra Wideband Systems; Joint with Conference on Ultra Wideband Systems and Technologies, Joint UWBST and IWUWBS 2004341-34

An adaptive transmit diversity scheme based on spatial signal combining for TH-PPM UWB

We propose an adaptive transmit diversity scheme for UWB impulse radio (IR), based on free space signal combining, which provides a significant increase in performance compared to the conventional single antenna MRRC receiver. The proposed scheme employs multiple transmitters, which adjust their transmit delays adaptively, in order to achieve perfect overlapping of pulses in space. This scheme uses a single correlator module at the receiver, and hence reduces the hardware complexity significantly, compared to S-RAKE receivers. The purpose behind free space signal combining is to improve the signal strength without multiplying the noise energy at the output of the correlator detector. Therefore, the proposed scheme can provide higher throughput with less complexity