Design and simulation of multi piconet UWB systems

Dissertant

Ali, Natiq Abd Allah

University

University of Technology

Faculty

-

Department

Electronic Engineering Department

University Country

Iraq

Degree

Master

Degree Date

2008

English Abstract

Impulse Radio - Ultra Wideband (IR-UWB) is a wireless technology system that offers a high data rate within a short range.

Therefore, IR-UWB system i regarded as an excellent physical layer solution to the multi-piconet Wireless Personal Area Network (WPAN) applications, In spite of all the advantages of D&M UWB, there are several fundamental and practical challenges that need \1& be carefully addressed.

The big and most important one among these challenges is the interference.

In this work, optimal and suboptimal Rake IR-UWB receivers and or Nary Transmit-Reference (TR) receivers that yield an optimal physical Jay candidate to multi-piconets WPANs are proposed.

The optimality concerned with largely mitigating (or suppression) of the Multi-User (MUI) and completely removing of the Inter-Pulse Interference (IPI).

Three Rake receivers are proposed, designed and simulated mitigate the MUI which are based on detecting a single chip (pulse) Rakes' fingers and supplying it to a decision or discriminator devices These Tare the Chip Decision (CD), Chip Discrimination with Threshold Fraction (CDTF), and Adaptive Chip Discrimination with Threshold Fraction (ACDTF) Rake rec & vers,£ The CD Rake receiver is based on whether a chip pulse detect wrong.

The CDTF is based on chip discriminator in which the j completely discarding when exceeding a certain threshold.-The ACD based on incorporating the pulse energy in the threshold quantity to get adaptive threshold.

It's shown that the ACDTF receiver has the best performance in terms achieving low Bit Error Rates (BERs) followed by CDTF and then receivers.

From the complexity view, it is shown that the CD Rake receiver BER target of 10"3, whereas the CDTF, CD and PID receivers need about 16, 17, and 17.5 dB of SNR respectively to achieve the same BER value.

On the other hand, to completely remove IPI, four different TR receivers are proposed based on bi orthogonal Hadamard matrix and the Reference Polarity (RP) of the pulse to get high information rate as compared with the currently proposed receivers.

The proposed TR receivers are coded and they balance the number of C+ is) and (Ls) in the data and reference pulses of the TR frame.

To improve the performance of the proposed TR receivers in multi user environments, a novel multiple access technique is proposed and incorporated to the proposed receivers based on Delay Hopping (DH) ; that is called "Multi-Symbol Delay Hopped Matrix" (MSDHM) in addition to the Time Hopping (TH) codes.

Furthermore, to largely suppress the MUI, a very simple novel Midpoint Impulse Correlation (MIC) technique is also proposed instead of the conventional correlation.

According to the above techniques, the four proposed TR receivers are : the MSDH, MSDH / RP, MSDH/MIC, and MSDH / RP / NTIC receivers.

The performance results of the four proposed receivers show that the MSDH/MIC receiver outperforms the others in terms of achieving low Symbol Error Rates {SERs) values.

But the MSDH / RP receiver has the lowest complexity among the others.

Hence, the MSDH / MTC receiver needs about 14.6 dB and 17.5 dB of SNR at SER target of 10'3 and 10"4 respectively, whereas the MSDH7RP / MIC receiver needs about 16.1 dB and 18.8 dB of SNR for the same SER values.

The seven proposed receivers are programmed using Matlab R2007a software and tested In various suggested scenarios close to the realistic multi-piconets WPAN environments using the dense multipath indoor IEEE 802.153a CM2.

Furthermore, they have also been compared with the lastly most published related literatures and they exhibited lower BERs and SERs values as compared with them.

Main Subjects

Electronic engineering

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Language

English

Data Type

Arab Theses

Record ID

BIM-305586