Digital World

About us
Image Processing
Quasicoherent Reception
Multipath Reception
Smart Antenna Forward Link or Smart Antenna Reverse Link
Multi Antenna Reception and Transmission
Optimal balance of info & pilot signal components
Power and Data Rate Transmission Control
Multi-User Detection
Contact

 

Multi-User Detection

1. At present multi-user detection is one of the most promising directions in the field of increasing the capacity and throughput of cellular radio communication systems. A great number of researches and scientific publications are devoted to the denoted direction.

2. The working experience in the field of multi-user detection is more than 5 years. During this time there are researched the main known direction in the field of multi-user detection such as: algorithms based on the maximum likelihood method, decorrelation algorithms, MMSE, iterative and sequential schemes. Methods of the joint use of multi-user detectors and decoder (convolution and turbo) - Turbo Multi-User Detection are investigated.

3. In the course of researches new unique interference canceling schemes relating to the sequential and interactive class are proposed. As compared with known methods the proposed algorithm has a higher convergence rate and better interference stability indicators.

4. The most important problem in the field of multi-user detection algorithms embedding is the complexity of their implementation. In this field there are proposed new unique methods of simplifying multi-user detection based on the implementation of interference canceling schemes at demodulator output. The basis of the proposed schemes is methods of fast calculation of mutual influence of user on each other (mutual correlation coefficients). All proposed know-how are defended by Russian and International patents.

5. In schemes with reverse coding (Turbo MUD) there is proposed a method of increasing MUD algorithms convergence based on the improvement of statistics features at decoder output on each MUD iteration.

6. The improvement of communication channel estimation characteristics (amplitude, phase, and delay) are researched using multi-user detection methods. It is shown that the existing communication channel estimation methods utilizing multi-user detection methods are non-perfect and can be substantially improved by MUD methods. There are proposed several simple in implementation and efficient communication channel estimation algorithms based on MUD methods defended by patents.



 

| About Us | Image Processing | Quasicoherent Reception |
| Multipath Reception | Smart Antenna Forward Link |
| Smart Antenna Reverse Link | Multi Antenna Reception and Transmission |
| Optimal balance of info & pilot signal components |
| Power and Data Rate Transmission Control | Multi-User Detection | Contact |