The capacity for a discrete-state code division multiple-access channel

Alencar, Marcelo S.

doi:10.1109/49.298067

Cited by 28 publications

(18 citation statements)

References 17 publications

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“…By using the terminology of [43], this gives rise to "fixed-rate" transmission. 4 The interpretation of [127] of the "delay-limited" capacity is associated with that reliable transmitted rate which is invariant and independent of the actual realization of the fading random phenomenon. Clearly, in the single-user case this policy leads to power inversion, thus making the observed channel absolutely independent of the realization of the fading 4 Fixed rates achieve also the full capacity C RTCSI [43] and do not necessarily imply channel inversion.…”

Section: Capacity Versus Outage (Capacity Distribution)mentioning

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: Capacity Versus Outage (Capacity Distribution)mentioning

confidence: 99%

Fading channels: information-theoretic and communications aspects

Biglieri

Proakis

Shamai³

1998

IEEE Trans. Inform. Theory

1,672

1,342

View full text Add to dashboard Cite

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“…the downlink transmission, while a fixed number of simultaneously transmitting users per each cell is assumed. Although a dynamic user population is a reasonable assumption for DS/FFH-CDMA practical cellular systems, the theoretical results derived in the paper can be applied directly in a DS/FFH-CDMA system, with a variable number of users per cell, considering that the number of users per cell K , represents the mean value of users per cell in a birth-death model describing the variable allocation of users [13].…”

Section: Basic Assumptions and System's Modelmentioning

confidence: 99%

On the optimum processing gain for a hybrid DS/FFH‐CDMA cellular system over Rayleigh fading channels

Varzakas

2011

Int J Communication

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SUMMARYThe optimization between the processing gain and the theoretically achievable average channel capacity per user (in the Shannon sense) of a constant total system's allocated bandwidth hybrid direct sequence/fast frequency hopping code-division multiple-access (DS/FFH-CDMA) cellular system, when operating in a Rayleigh fading environment, is presented. Then, the spectral efficiency, expressed in (bits/s/Hz), is estimated in terms of the achievable average channel capacity per user, during the operation over a broadcast cellular time-varying link, and leads to a simple theoretical novel-closed-form expression for the optimal processing gain value based on the maximization of the achieved spectral efficiency. The final expression derived can be useful for the practical design of a DS/FFH-CDMA cellular system and for an initial quantitative analysis since it relates to the optimal processing gain applied and all system's parameters. Finally, numerical results are presented to illustrate and prove the validity of the presented analysis.

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“…the optimal average received spread SIR with diversity reception equals to (15) using directly Equation (13). Then, the optimal SIR op received by each user as it reaches the boundary of a cell, can be found directly from Equation (15), as follows i.e.…”

Section: Estimation Of Optimal Sir In a Rayleigh Fading Environmentmentioning

confidence: 99%

Optimal SIR for an hybrid cellular DS/SFH CDMA system

Varzakas

2007

Int J Communication

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SUMMARYA hybrid direct-sequence/slow frequency hopping code-division multiple-access (DS/SFH CDMA) system operating in a Rayleigh fading environment is described and its spectral efficiency is estimated in terms of the theoretically achievable average channel capacity (in the sense of information theory) per user. The analysis covers the operation over a broadcast cellular time-varying link and leads to a simple novel closed-form expression for the optimal average spread signal-to-interference power ratio (SIR) received by each user based on the maximization of the achieved spectral efficiency.

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The capacity for a discrete-state code division multiple-access channel

Cited by 28 publications

References 17 publications

Fading channels: information-theoretic and communications aspects

Fading channels: information-theoretic and communications aspects

On the optimum processing gain for a hybrid DS/FFH‐CDMA cellular system over Rayleigh fading channels

Optimal SIR for an hybrid cellular DS/SFH CDMA system

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