In this paper, we consider the application of multiuser detection to the downlink of interference-limited multipleinput multiple-output (MIMO) cellular systems. MIMO systems have been shown to yield a tremendous capacity for a single link with white Gaussian noise. In a cellular environment, there will often be co-channel interference from other cells, which becomes the dominating channel impai...

Present day direct sequence code division multiple access (DS/CDMA) systems treat each user separately as a signal, with all ofthe other users representing interference or noise. Potentially significant capacity improvements can be achieved if the negative effect that each user has on the others is cancelled. In other words, joint detection (multiuser detection), rather than separate detection,...

Introduction: Detection and estimation theory is one of the core investigation areas in communications. Multiuser detection (MUD) is an estimation problem in which different users transmit their signals through the same channel in a multiple access channel (MAC). In this way the receiver explores desired signal through the ambient noise and interference generated by other user signals. Multiuse...

We propose a low complexity iterative multiuser decoder. We perform the multiuser a-posteriori probability calculation based on the marginalization of probabilities over a subset of the P highest probable sequences. Given a K user symmetric channel this list may be approximated closely with per-bit computational complexity O K P 2K logK . We further show that for any multiuser system possessing...

Multiuser detection in Code Division Multiple Access systems usually requires either knowledge of the transmitted signature sequences and channel state information or use of a known training sequence for adaptation. In this paper we develop a scheme that can be employed for the joint adaptive blind multiuser identification and detection in asynchronous CDMA systems. This scheme relies on a mult...

Multiuser Detection for Turbo-Coded DS/CDMA. (May 2001)Qinghua Li, B.E., South China University of Technology;M.E., Tsinghua University, BeijingCo–Chairs of Advisory Committee: Dr. Costas N. GeorghiadesDr. Xiaodong Wang Multiuser detection and turbo coding are two of the most powerful techniquesfor enhancing the performance of next-generation wideband code-division multiple-...

In this paper novel CNN based multiuser detection algorithms are proposed which can provide high performance mobile communication. Multiuser detection in CDMA system come down to quadratic optimization. CNNs are capable of fast quadratic optimization when the quadratic form arising from the detection problem is generated by a sparse matrix. Since multiuser communication under heavy loaded scena...

This paper describes power-controlled multi carrier and multiuser detection techniques for Code Division Multiple Access (CDMA) systems. In conventional CDMA systems, a RAKE receiver is employed to overcome wireless channel effect due to frequency selective characteristics of wireless CDMA systems. Alternatively, multi carrier technique can also be used to overcome the effect of frequency selec...

The adoption of multiple antennas both at the transmitter and the receiver will explore additional spatial resources to provide substantial gain in system throughput with the spatial division multiple access (SDMA) technique. Optimal multiuser MIMO linear precoding is considered as a key issue in the area of multiuser MIMO research. The challenge in such multiuser system is designing the precod...