Performance Evaluation of Interference Cancellation using SIC and PIC for WCDMA Systems
| dc.contributor.advisor | Ayele, Hailu (PhD) | |
| dc.contributor.author | Kebede, Gebru | |
| dc.date.accessioned | 2018-06-26T06:30:43Z | |
| dc.date.accessioned | 2023-11-28T14:09:06Z | |
| dc.date.available | 2018-06-26T06:30:43Z | |
| dc.date.available | 2023-11-28T14:09:06Z | |
| dc.date.issued | 2007-09 | |
| dc.description.abstract | Third generation wireless communications in conjunction with multimedia services has produced an increased demand for bandwidth efficient multiple access schemes. The need for increased capacity and improved performance motivate the search for better receiver structures, of which multiuser detection is a key technology that can substantially increase the system capacity and data rate. Due to the limitations of the conventional matched filter, the capacity of a single cell using CDMA is limited by self-interference and is subject to the near–far problem, and treats multiple access interference (MAI) as if it were AWGN. This thesis presents under a category of multiuser detection the most promising sub-optimal receiver structures, successive interference cancellation (SIC) and parallel interference cancellation (PIC) which are used to combat MAI in order to increase the data rate and capacity of the system which is applicable for WCDMA system and beyond. These subtractive interference cancellation receivers treat MAI as additional information to aid in detection in order to overcome the drawbacks seen by conventional matched filter. In this work we present a performance evaluation of these interference cancellers using SIC and PIC, and their performance is compared based on theoretical analysis and simulation results in AWGN and multipath fading channels. Simulation results using bit error rate (BER) versus signal to noise ratio (SNR) in multipath fading channel for different value of data size and number of users under perfect power control condition reveals that PIC achieves significant performance over conventional matched filter and SIC. And, as the data size (in bits) from the transmitting end increases the computational complexity of the multiuser detector become higher, however in PIC as the stage of multiple access interference cancellation increases the performance is reached remarkable level. In AWGN channel, simulation results confirmed that matched filter has shown optimum performance over SIC and PIC multiuser detectors when orthogonal spreading codes are assigned for each user in the network. Additionally, in this work receiver structures are evaluated on the basis of computational complexity. | en_US |
| dc.identifier.uri | http://etd.aau.edu.et/handle/12345678/3435 | |
| dc.language.iso | en | en_US |
| dc.publisher | Addis Ababa University | en_US |
| dc.subject | WCDMA Systems | en_US |
| dc.title | Performance Evaluation of Interference Cancellation using SIC and PIC for WCDMA Systems | en_US |
| dc.type | Thesis | en_US |