| Author | Shamim, Md. Ahsan |
| Call Number | AIT Thesis no. TC-96-6 |
| Subject(s) | Cellular radio
|
| 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 |
| Abstract | Although indoor wireless channel is generally modeled as single-state Rician fading
channel with Rice factor, k=6.8dB, but experimental observations over in-building
environment have shown that signals experience Rayleigh fading a fraction of time and
Rician fading with k= 10-12dB other fraction of time.
This research considers the pico-cellular channel model as a two-state RayleighRician model in order to consider the burstiness of the channel. In this case, an error can
occur in either the good or the bad state, but with different probabilities. The fraction of
total time signals following Rician fading, B, is considered as 5/7. A DS-CDMA system
with QPSK has been simulated in the indoor environment to evaluate its performance in
terms of BER and S/(I+N). Open loop power control is used to mitigate the 'near-far'
problem. Simulation results for combined fading channel have shown slightly better
performance than single state model for large number of users. In order to consider system
imperfection on power control, performance without power control is analyzed at first.
Then, the performance degradation is evaluated with power control error that is
approximated by a log-normally distributed random variable with zero mean and standard
deviation of 0-12dB. Finally, a two-cell environment is also studied to investigate the
performance of the model. |
| Year | 1996 |
| Type | Thesis |
| School | School of Engineering and Technology (SET) |
| Department | Department of Information and Communications Technologies (DICT) |
| Academic Program/FoS | Telecommunications (TC) |
| Chairperson(s) | Ahmed, Kazi Mohiuddin |
| Examination Committee(s) | Makelainen, Kimmo;Erke, Tapio J. |
| Scholarship Donor(s) | Finnish International Development Agency (FINNIDA) Finland |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 1996 |