On the usefulness of outer-loop power control with successive interference cancellation

Buehrer, R. Michael; Mahajan, Rahul

doi:10.1109/tcomm.2003.820756

Cited by 10 publications

(5 citation statements)

References 16 publications

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“…While the assumption of equal spreading gain and SINR is valid for voice users, for heterogeneous services (voice, data, and multimedia applications) we need to relax this constraint. In this contribution, we extend the results obtained in [7], [8] by considering a more general scenario that accommodates users having unequal pathloss, SINR and data rate requirements.…”

Section: Introductionmentioning

confidence: 73%

“…For rectangular chips and a synchronous channel, ρ equals 1 and 0.5 for equal and random phase, respectively [7]. For k = 2, (4) reduces to…”

Section: System Model and Analysismentioning

confidence: 99%

“…In [4], the optimal received power profile for a linear SIC system with a given decoding order was derived assuming equal spreading gain and signal-to-interference-plus-noise ratio (SINR) for all the users. The received power profile for different SINR requirements was addressed in [7]. The problem of finding the optimal decoding order for SIC has been investigated in [8] and [9] based on path loss and SINR requirements, respectively.…”

Section: Introductionmentioning

confidence: 99%

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The Effects of Ordering Criteria in Linear Successive Interference Cancellation in CDMA Systems

Mohammad

Buehrer

2008

IEEE Trans. Wireless Commun.

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It is well-known that multiuser detection techniques such as successive interference cancellation (SIC) can obtain significant performance improvement over traditional matched filter receivers in code division multiple access (CDMA) systems. Due to its simplicity and usefulness, the SIC structure has received significant attention for several years. In this letter, we make three contributions to the understanding of this receiver structure. First, we derive a closed form expression for received power profile of linear SIC with arbitrary spreading gain and SINR requirements. Second, using this expression we examine the performance of SIC under various ordering criteria based on spreading gain, path loss, and SINR/BER requirement. Third, we show that using a very simple and well-known sorting algorithm, we can obtain a cancellation order and set of power control levels which are very near the optimum in terms of minimizing total transmit power.Index Terms-CDMA, successive interference cancellation (SIC), ordering criteria.

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Section: Introductionmentioning

confidence: 73%

“…For rectangular chips and a synchronous channel, ρ equals 1 and 0.5 for equal and random phase, respectively [7]. For k = 2, (4) reduces to…”

Section: System Model and Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The Effects of Ordering Criteria in Linear Successive Interference Cancellation in CDMA Systems

Mohammad

Buehrer

2008

IEEE Trans. Wireless Commun.

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“…Now, for α > 1, SIR i (αp(n)) ≥ SIR i (p(n)) and Q(x) is a monotonically decreasing function. Thus, by comparing (9) and (10) we see that αT i (p(n)) > T i (αp(n)). This can also be proved for the case BER tgt −BER i (p(n)) > 0.…”

Section: ) Scalabilitymentioning

confidence: 93%

“…But the documentation lacks in simulation results to support the mathematical analysis. Buehrer et al [10] again analyzed the BER-based power control algorithm proposed in [9] for convergence. It was shown that the algorithm converges to a fixed point for successive interference cancellation.…”

Section: Introductionmentioning

confidence: 99%

WLC04-1: A Distributed BER-Based Power Control Algorithm for WCDMA Systems

Mandhare

Ghrayeb

2006

IEEE Globecom 2006

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Taking into consideration the dominance of the multiple access interference (MAI) in spread spectrum based CDMA systems, power control plays a vital role in reducing the system interference and helps in increasing the capacity of the system while maintaining the quality of the received signal. Closed loop power control is mainly used to mitigate the nearfar effect in the uplink direction. In this paper, we propose a bit error rate (BER)-based first order distributed power control algorithm. Being distributed, the proposed algorithm has the flexibility of using the benefits of fast closed loop power control and thus can be used to update the transmit power of a single user at a time. Signal-to-interference ratio (SIR) based algorithms are in extensive use. But considering that the SIR is time variant, the BER would be a better quality of service (QoS) parameter because it can be easily measured using already known pilot bits. We analyze the convergence performance of the proposed algorithm and show that its convergence is always guaranteed. We demonstrate that a considerable improvement in the convergence speed along with the required average signal-tonoise ratio (SNR) is achieved as compared with other BER-based algorithms under comparison. We also show that the proposed algorithm performs well at different mobile speeds.Index Terms-Bit error rate, power control, uplink channel, WCDMA.

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An Enhanced Link Adaptation Scheme Based on Cooperative Interference Prediction for MIMO-OFDM Systems

Peng

Yang

Yuan³

et al. 2012

Wireless Pers Commun

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On the usefulness of outer-loop power control with successive interference cancellation

Cited by 10 publications

References 16 publications

The Effects of Ordering Criteria in Linear Successive Interference Cancellation in CDMA Systems

The Effects of Ordering Criteria in Linear Successive Interference Cancellation in CDMA Systems

WLC04-1: A Distributed BER-Based Power Control Algorithm for WCDMA Systems

An Enhanced Link Adaptation Scheme Based on Cooperative Interference Prediction for MIMO-OFDM Systems

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