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Abstract-This paper presents a semi-analytical method to predict the performance of iterative interference cancellers used in advanced multiuser MIMO CDMA systems. At the receiver side, the orthogonality between codes is restored by a chip rate equalization allowing the transmitted symbols to be subsequently estimated by a simple correlations. The proposed prediction method is based on Signal to Interference-plus-Noise...
This paper presents a dual mode fast performance prediction method for iterative minimum-mean square error interference cancellation based joint decoding in a very general multiuser MIMO setting, considering a transmission over block-fading frequency-selective channels. The symbolic mode relies on a signal to interference-plus-noise ratio compression at symbol level, by means of the mutual information...
This paper presents a novel fast performance prediction method for iterative minimum-mean square error interference cancellation based joint decoding in a very general multiuser MIMO setting considering a transmission over block-fading frequency-selective channels. A Gaussian approximation is made for all propagated messages between the outer codes and the space-time multiuser detector. The method...
Linear transceiver design for multiple access channels (MACs) with spatial correlation at both transmitter and receiver is investigated in the presence of inaccurate channel state information (CSI). We consider a training-based channel estimation at the receiver while a limited-rate feedback channel conveys the transmitter information. Imperfect knowledge comes from the channel estimation errors and...
In this paper, we propose a fast prediction method adapted to multi-user turbo detection based on linear filtering and successive interference cancellation. Using Gaussian approximation, compression and quality tables, the method provides for each user its expected transmission quality at each iteration according to the linear filter of the multi-user detector (MMSE or Matched Filter) as well as its...
Waterfilling enables a dramatic increase in capacity of multiple antenna systems, but requires perfect knowledge at transmitter.When a finite discrete rate is available, this algorithm is no more optimal since the interest lies in maximizing the sum discrete-rate. In this paper, motivated by a feedback reduction, we introduce a transceiver that partially decouples the channel into parallel subchannels...
Traditional information-theoretic approaches to study channel feedback assume that the information is sent from the receiver to the transmitter via an ideal (instantaneous high-rate and error-free) feedback link. This paper investigates the problem of reliable communication over non-ergodic memoryless (stationary) channels using non-errorfree feedback links. We first provide a coding theorem showing...
This paper investigates the effect of channel estimation errors in presence of spatial correlation for fading MIMO multiple access channels (MACs). Specifically, the capacity is derived under the notion of reliable communication based on the average of the error probability over all channel estimation errors. Although not necessarily optimality in presence of channel estimation errors, we restrict...
This paper investigates a new concept that combines space-time coding with the layered architecture of successive interference cancellation with per antenna rate control (PARC- SIC) for wireless MIMO channels, relying on partial feedback. The key element is to exploit an additional degree of freedom (DoF), namely antenna partitioning, in addition to decoding order and power control considering that...
This paper investigates the combination of spatial multiplexing and overloading as an evolution of the UMTS-HSDPA (high speed downlink packet access) toward very high spectral efficiencies in the case of no (or very limited) channel state information at transmitter. Overloaded spreading is carried out in the time domain only (independent per antenna), transmit space diversity is partially recovered...
In this paper, frequency-domain implementation of a block turbo-equalizer where ISI suppression and CAI resolution are performed separately is presented. This functional split allows deriving efficient low complexity structures based on a modified doubly iterative architecture which ensure better tradeoff between performance and complexity. We focus on a modified doubly-iterative and hybrid structure...
This paper investigates the combination of spatial multiplexing and overloading as an evolution of the UMTS-HSDPA (high speed downlink packet access) toward very high spectral efficiencies. The base station employs single-carrier space-time bit-interleaved coded modulations with linear preceding for each user. From an information-theoretic point of view, this scheme is potentially capacity achieving...
In this paper, a frequency domain implementation of a block-wise space-time turbo equalizer is presented where InterSymbol Interference and Multiple Antenna Interference are dealt with separately. Thanks to this functional split, we also introduce a low complexity turbo equalizer based on a Matched Filter approximation of the T-dimensional equalizer from a given iteration. Considering a Space Time...
This paper addresses the problem of transmitting space-time interleaved coded signals over multiple-input multiple-output (MIMO) block fading channels with intersymbol interference (ISI). At the receiver, we investigate a cooperative approach in which data detection, decoding, and channel estimation are performed separately and iteratively. Computationally efficient methods based on the expectation-maximization...
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