Performance analysis of MIMO - OFDM multiband UWB systems in a lognormal fading channel | |
| Author | Vien Hoai Nam |
| Call Number | AIT Thesis no.TC-06-10 |
| Subject(s) | Ultra-wideband devices Orthogonal frequency division multiplexing MIMO systems |
| Note | A thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering, School of Engineering and Technology |
| Publisher | Asian Institute of Technology |
| Series Statement | Thesis ; no. TC-06-10 |
| Abstract | Multiple - input multiple - output orthogonal frequency division multiplexing (MIMO - OFDM) techniques are applied to ultrawideband (UWB) systems to obtain high rate communications over indoor wireless channels. The MIMO - OFDM multiband system specification is developed by IEEE 802.15.3a task group for Wireless Personal Area Network (WPAN). According to some real measurements done by IEEE 802.15.3a task group, IEEE UWB channel model was proposed. It follows the modified Saleh - Velenzuela (S - V) model. Lognormal distribution is used for multipath components. Moreover, arrival rays are clustered. In this thesis, a general scenario is set up to investigate the performance of MIMO - OFDM multiband UWB systems without specific coding schemes. A lower bound of pairwise error probability (PEP) is derived in case of KN,N,L system (K band hopping, N, transmit antennas, N, receive antennas and L path components) in independent lognormal fading channels. Based on the theoretical analysis, a space - time - frequency code design criterion is proposed. The criterion is the same as the trace criterion for space - time code design, which aims to maximize the minimum Euclidean distance between any two distinct codewords. Simulation is carried out on the proposed scenario. Different Space - Time - Frequency (STF) trellis codes with different minimum Euclidean distances (4, 10, 12 and 16) are applied to the system. Simulation results show that the performance of optimum STF trellis code outweighs Tarokh's code about 3 dB. In case of different optimum codes, performance of the proposed system also agrees with our trace criterion in small SNR |
| Year | 2006 |
| Corresponding Series Added Entry | Asian Institute of Technology. Thesis ; no. TC-06-10 |
| Type | Thesis |
| School | School of Engineering and Technology (SET) |
| Department | Department of Information and Communications Technologies (DICT) |
| Academic Program/FoS | Telecommunications (TC) |
| Chairperson(s) | Rajatheva, R.M.A.P. ; |
| Examination Committee(s) | Ahmed, Kazi M.;Sharma, A.B. ; |
| Scholarship Donor(s) | Electricity of Vietnam; |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 2006 |