Spectral Efficiency Performance Analysis of Multi-Band Orthogonal Frequency Division Multiplexing Physical Layer using Channel Division Multiple Access under Ultra Wide BandChannel
| Full Text |
Pdf
|
| Author | Houda CHIHI, RidhaBouallegue |
| ISSN | 2306-708X |
| On Pages | 13-18 |
| Volume No. | 2 |
| Issue No. | 3 |
| Issue Date | ------- |
| Publishing Date | ------ |
| Keywords | MBOFDM, ChDMA, UWB, spectral efficiency,PDP. |
Abstract
This contribution presents an investigation into methods for maximizing the spectral efficiency of Multi Band Orthogonal Frequency Division Multiplexing (MBOFDM) system. As part of this an asymptotic analysis of a new waveform based on the integration of Channel Division multiple access technique (ChDMA) in Multi-Band OFDM system over Ultra Wide Band high data rate channel is presented. This system allows to combat frequency selectivity and to solve problems related to the coexistence of many users. In order to serve multiple users simultaneously, this new multiple access system brings an interesting degree of freedom as it is based on the use of the Channel Impulse Responses (CIR) as user signatures. We will discuss the benefits of the multiple access scheme performance, and then we evaluate the spectral efficiency when the number of frequency dimensions and the number of users increases at a constant ratio. Also, we present an analysis of the impact of the power delay profile (PDP) on the spectral efficiency of MBOFDM-ChDMA-UWB system assuming a correlation between the delay and the energy of the paths. As a result we observe that the spectral efficiency performance depends on the system load, the power delay profile and the noise variance.
Back
