Evaluation of real time performance of impulse radio time hopping UWB field bus | |
| Author | Haroom, Farah |
| Call Number | AIT Diss no.TC-11-02 |
| Subject(s) | Ultra-wideband devices Wireless communication systems--Technological innovations |
| Note | A dissertation submitted in partial fulfillment of the requirements for the degree of Doctor of Engineering in Telecommunications, School of Engineering and Technology |
| Publisher | Asian Institute of Technology |
| Series Statement | Dissertation ; no. TC-11-02 |
| Abstract | Recent work suggests an inclination of unlicensed wireless technologies in short range, low data rate industrial field level communication. However, the involvement of IEEE S02.15.4a is unexplored so far. This thesis is concerned with the solutions and problems related to its admittance in industrial Field Bus technology and evaluates the respective real time performance. Regardless of the previous efforts, the imperative aspect of this research study is the consideration of realistic channel characteristics that a Field Bus can encounter. Abundance of scattering and reflections cause dense multipath propagation in presence of broadband noise and interferences produced from motors, generators and other machines. Burst position modulation-binary phase shift keying (BPM-BPSK) modulated IEEE S02.15.4a impulse radio time hopping ultra wide band (IR-TH UWB) with very fine duration of pulses and a bandwidth greater than 500 MHz is chosen to combat against all such issues. Various medium access control (MAC) concerns regarding timeliness of field data are also treated. Generally two types of data services come across between sensor/ actuator and master nodes. Synchronous communication handles the regular periodic exchange of sensor and actuator states while asynchronous is used for urgent emanation of alarm and emergency events. IEEE S02.15.4a MAC lags prioritized channel allocation and consequently does not lead to real time guarantees and deterministic delays. Accordingly, priority assignment is brought in on behalf of addressable TH codes which help to meet the deadlines. Superframe structure is modified and a self configuring TH-TDMA MAC is proposed to ensure the transfer of highest priority asynchronous data in the next forth coming time slot. An analytical solution to find the accessing delays along with traffic modeling is presented in comparison with IEEE S02.15.4a MAC. The realistic attributes of an industrial surroundings are accounted by involving IEEE S02.15.4a industrial non line of sight (NLOS) environment of channel model S (CMS). The respective channel characteristics including impulse response, power delay profile (PDP), probability and cumulative density functions of the received signal to noise ratio (SNR) are explored. Besides timeliness, real time performance also deals with correctness of data. Hence in this thesis, the reception and error performances of IR-TH UWB over additive white Gaussian noise (AWGN) and CMS are also addressed and validated. Correlation and selective Rake (SRake) receivers requiring a large number of fingers are employed. Likewise, the broadband noise and interferences modeled as mono and multi fractals are included. For their eradication an adaptive SRake architecture is proposed which incorporates an adaptive noise canceler in front of conventional SRake receiver. It increases the SNR of the enervated Ultra Wide Band (UWB) signal which is utilized to reduce the number of SRake fingers. In summary, all this is contributed as a first step towards the exploitation of IEEE S02.15.4a in industrial Field Bus systems. |
| Year | 2011 |
| Corresponding Series Added Entry | Asian Institute of Technology. Dissertation ; no. TC-11-02 |
| Type | Dissertation |
| School | School of Engineering and Technology (SET) |
| Department | Department of Information and Communications Technologies (DICT) |
| Academic Program/FoS | Telecommunications (TC) |
| Chairperson(s) | Ahmed, Kazi M.; |
| Examination Committee(s) | Rajatheva, R.M.A.P. ;Manukid Parnichkun ; |
| Scholarship Donor(s) | Higher Education Commission (HEC), Pakistan-AIT Fellowship; |
| Degree | Thesis (Ph.D.) - Asian Institute of Technology, 2011 |