Performance of SIR-based power control for UMTS

Gunaratne, S.; Nourizadeh, S.; Jeans, T.G.; Tafazoli, R.

doi:10.1049/cp:20010004

Cited by 10 publications

(4 citation statements)

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“…The difference in the value of E b /N 0 between the linear scheme and the combination of the other two schemes is negligible, occurring at a P p value of approximately 0.4. Results for (19) considering both perforation and synergy show a trend similar to that seen in Fig. 9.…”

Section: Fixed Linear Llr Conversionsupporting

confidence: 77%

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Collision Mitigation by Log-Likelihood Ratio (LLR) Conversion in Orthogonal Code-Hopping Multiplexing

Kwon

Park

Sung³

2006

IEEE Trans. Veh. Technol.

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Log-likelihood ratio (LLR) conversion schemes are proposed to mitigate the effect of collisions (or perforations) that occur in orthogonal code-hopping multiplexing (OCHM), which was previously proposed to accommodate more downlink channels than the number of orthogonal codewords. The proposed LLR conversion schemes greatly reduce the required SNR in channel decoding even when the perforation probability is high. The perforation probability in some LLR conversion schemes is estimated and several estimation methods are proposed. An LLR conversion scheme without estimation of the perforation probability is also proposed to avoid accurate estimation. The performance of the proposed schemes is evaluated by simulation in terms of the required E b /N 0 for a 1% block error rate (BLER).

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Section: Fixed Linear Llr Conversionsupporting

confidence: 77%

“…The value of SIR can be estimated using the first and second moments [19], [20] when there is no perforation…”

Section: A Sir Estimationmentioning

confidence: 99%

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Collision Mitigation by Log-Likelihood Ratio (LLR) Conversion in Orthogonal Code-Hopping Multiplexing

Kwon

Park

Sung³

2006

IEEE Trans. Veh. Technol.

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“…In order to maximize capacity and quality of service (QoS), all mobile station (MS) transmissions should be received at the base station (BS) with equal power [1,2]. Since CDMA systems are interference limited, much work concentrates on the signal to interference ratio as a measure to control MS powers [3][4][5][6]. In theory, assuming perfect knowledge of the SIR, SIR based PC outperforms signal strength based PC.…”

Section: Introductionmentioning

confidence: 99%

Linear quadratic power control for CDMA systems

Anderson,

White

2003

JTIT

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In this paper, we present a robust decentralized method for jointly performing channel estimation and closed loop power control for the reverse link of CDMA networks. Our method, based on linear quadratic Gaussian (LQG) control systems theory and Kalman filtering, does not require any training symbols for channel or signal to interference ratio (SIR) estimation. The main interest of this new scheme is that it improves the performance of current SIR based power control techniques while avoiding the problem of power escalation, which is often observed in current systems.

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