A High-Throughput Random Access Protocol for Multiuser MIMO Systems

Throughput Maximization in Linear Multiuser MIMO-OFDM Downlink Systems

channel estimation for mimo-ofdm systems

تخمین دقیق مشخصات کانال در سیستم های مخابراتی یک امر مهم محسوب می گردد. این امر به ویژه در کانال های بیسیم با ‏خاصیت فرکانس گزینی و زمان گزینی شدید، چالش بزرگی است. مقالات متعدد پر از روش های مبتکرانه ای برای طراحی و آنالیز ‏الگوریتم های تخمین کانال است که بیشتر آنها از روش های خاصی استفاده می کنند که یا دارای عملکرد خوب با پیچیدگی ‏محاسباتی بالا هستند و یا با عملکرد نه چندان خوب پیچیدگی پایینی...

Aspects of Multiuser MIMO for Cell Throughput Maximization

We consider a multiuser MIMO downlink scenario where the resources in time, frequency and space are allocated such that the total cell throughput is maximized. This is achieved by exploiting multiuser diversity, i.e. the physical resources are allocated to the user with the highest SNR. We assume perfect channel knowledge at the transmitter which may be obtained from estimation of the uplink si...

Coverage Analysis for Multiuser MIMO Broadcast Systems

In this paper, we present the closed-form expressions for the link outage and coverage of the zeroforcing beamforming (ZFB) and zero-forcing dirtypaper coding (ZF-DPC) multiuser multi-input multioutput (MIMO) broadcast systems. We find that the ZF-DPCMIMO broadcast system has a larger diversity order and better coverage compared with the ZFB MIMO broadcast system. Furthermore, it is observed th...

Transmitter Layering for Multiuser MIMO Systems

A novel structure for multiple antenna transmissions utilizing space-time dispersion is proposed, where the original data stream is divided into K substreams which are modulated onto all available transmit antennas using stream-specific transmit signature sequences. In order to achieve this, the transmit antennas are partitioned into M groups of antennas, called partitions. The signals from the...