Multi-stage interference cancellation in multi-rate DS/CDMA systems

Johansson, Ann-Louise; Svensson, Arne

doi:10.1109/pimrc.1995.477087

Cited by 14 publications

(7 citation statements)

References 14 publications

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“…The problems of the detection delay in SIC or ISDIC may be alleviated to some extent by devising methods that perform parallel interference cancellation (PIC), as described by Patel and Holtzman [488] and others [445], [465].…”

Section: F Iterative Interference Cancellationmentioning

confidence: 99%

Fading channels: information-theoretic and communications aspects

Biglieri

Proakis

Shamai³

1998

IEEE Trans. Inform. Theory

1,672

1,342

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Abstract-In this paper we review the most peculiar and interesting information-theoretic and communications features of fading channels. We first describe the statistical models of fading channels which are frequently used in the analysis and design of communication systems. Next, we focus on the information theory of fading channels, by emphasizing capacity as the most important performance measure. Both single-user and multiuser transmission are examined. Further, we describe how the structure of fading channels impacts code design, and finally overview equalization of fading multipath channels.

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Section: F Iterative Interference Cancellationmentioning

confidence: 99%

Fading channels: information-theoretic and communications aspects

Biglieri

Proakis

Shamai³

1998

IEEE Trans. Inform. Theory

1,672

1,342

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“…Here we repeat the operation in multiple rounds (iterations), where in each iteration we successively refine the decision on each of the users. We note that doing successive interference cancellation in multiple stages (for asynchronous CDMA in the uplink) was also independently suggested by [6], with only ad hoc derivation. Another large improvement is obtained here due to the inclusion of deterministic annealing technique [24], [25] to try to avoid local maxima.…”

Section: Introductionmentioning

confidence: 93%

“…The th column of , , is the distorted code of user at the channel output, truncated to . Equation (5) can be also expressed in the form (6) Note that the (5) or (6) are also appropriate for describing the synchronous CDMA uplink.…”

Section: System Modelmentioning

confidence: 99%

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Suboptimal maximum-likelihood multiuser detection of synchronous CDMA on frequency-selective multipath channels

Raphaeli

2000

IEEE Trans. Commun.

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Abstract-We propose a signal processing technique, based on the estimate-maximize algorithm, in order to perform multiuser code-division multiple-access (CDMA) detection. This algorithm iteratively seeks for the maximum-likelihood solution. The resulting structure is a successive interference cancellation scheme which can be applied to both synchronous and asynchronous CDMA. Higher performance than similar methods is obtained from using deterministic annealing and multiple stages. A soft output is defined, and the signal-to-noise ratio in the soft output of the detector is measured for predicting performance with an outer code with soft input decoder. The new receiver is applied to the problem whereby in a synchronous CDMA system the orthogonality of the codes is destroyed by a frequency-selective channel, caused by multipath fading. This nonlinear technique is shown to perform much better than the minimum mean-square-error linear solution and several other algorithms. The algorithm lends itself to an efficient DSP or VLSI implementation. We evaluate the performance by simulations with coherent quadrature phase-shift keying modulation, known channel and long random Rayleigh multipath. In most cases, we set the number of users equal to the processing gain for maximal throughput. The results are also presented in the form of outage probabilities for random Rayleigh multipath against required fading margin.

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“…Both stationary and fading channels are considered. Due to the page limitation the description is brief, but the interested reader is referred to our previous publications [9]-[ 111, [20]- [22] for more details.…”

Section: Introductionmentioning

confidence: 99%

On multirate DS/CDMA with interference cancellation for wireless multimedia applications

Johansson

Ottosson

Svensson

1996 IEEE International Conference on Personal Wireless Communications Proceedings and Exhibition. Future Access

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Different modulation schemes supporting multiple data rates in a direct sequence code division multiple access (DS/CDMA) system are studied. A successive multistage interference cancellation scheme for the considered modulations is described. Bit error probability on both AWGN and Rayleigh fading channels are presented both with single user detection and with multistage interference cancellation. It is shown that DS/ CDMA is very flexible in supporting multiple data rates for wireless multimedia applicatidns and that significantly improved performance may be obtained using interference cancellation.

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Multi-stage interference cancellation in multi-rate DS/CDMA systems

Cited by 14 publications

References 14 publications

Fading channels: information-theoretic and communications aspects

Fading channels: information-theoretic and communications aspects

Suboptimal maximum-likelihood multiuser detection of synchronous CDMA on frequency-selective multipath channels

On multirate DS/CDMA with interference cancellation for wireless multimedia applications

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