Adaptive inverse power control using an FxLMS algorithm

Marko Höyhtyä; Aarne Mämmelä

doi:10.1109/VETECS.2007.619

Adaptive inverse power control using an FxLMS algorithm

Marko Höyhtyä, Aarne Mämmelä

Research output: Chapter in Book/Report/Conference proceeding › Conference article in proceedings › Scientific › peer-review

13 Citations (Scopus)

Abstract

In this paper, a novel adaptive inverse power control method that is based on the filtered-x LMS (FxLMS) algorithm is introduced. Inverse power control minimizes the interference that a cognitive radio creates to licensed users and allows more users to share the spectrum. It is also needed in multi-access systems like code division multiple access (CDMA) to alleviate the near-far problem. The proposed variable step algorithm adjusts the step size in a nearly optimal way. Based on numerical analysis this new method clearly improves system performance compared to the algorithm where the well-known fixed or variable step adjustment power control is used. A normalized version of the FxLMS algorithm is needed in a fading channel. In a slowly fading channel (e.g., normalized Doppler frequency of 0.001) the FxLMS power control can keep the received signal-to-noise ratio (SNR) in the desired level with a good accuracy most of the time. The standard deviation of the received SNR is 1.92 dB when the received SNR is kept at 10 dB. The results with almost all different SNR values are better than the other methods can achieve.

Original language	English
Title of host publication	2007 IEEE 65th Vehicular Technology Conference
Subtitle of host publication	VTC2007-Spring
Publisher	IEEE Institute of Electrical and Electronic Engineers
ISBN (Print)	978-1-4244-0266-3
DOIs	https://doi.org/10.1109/VETECS.2007.619
Publication status	Published - 2007
MoE publication type	A4 Article in a conference publication
Event	IEEE 65th Vehicular Technology Conference, VTC2007-Spring - Dublin, Ireland Duration: 22 Apr 2007 → 25 Apr 2007 Conference number: 65

Conference

Conference	IEEE 65th Vehicular Technology Conference, VTC2007-Spring
Abbreviated title	VTC2007-Spring
Country/Territory	Ireland
City	Dublin
Period	22/04/07 → 25/04/07

Keywords

keywords-adaptive transmission
inverse control
FxLMS algorithm
near-far problem
CDMA
programmable control
power control
least squares approximation
interference

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10.1109/VETECS.2007.619

Cite this

@inproceedings{e0cdeeb96ad040f084ad08ea71942f5b,

title = "Adaptive inverse power control using an FxLMS algorithm",

abstract = "In this paper, a novel adaptive inverse power control method that is based on the filtered-x LMS (FxLMS) algorithm is introduced. Inverse power control minimizes the interference that a cognitive radio creates to licensed users and allows more users to share the spectrum. It is also needed in multi-access systems like code division multiple access (CDMA) to alleviate the near-far problem. The proposed variable step algorithm adjusts the step size in a nearly optimal way. Based on numerical analysis this new method clearly improves system performance compared to the algorithm where the well-known fixed or variable step adjustment power control is used. A normalized version of the FxLMS algorithm is needed in a fading channel. In a slowly fading channel (e.g., normalized Doppler frequency of 0.001) the FxLMS power control can keep the received signal-to-noise ratio (SNR) in the desired level with a good accuracy most of the time. The standard deviation of the received SNR is 1.92 dB when the received SNR is kept at 10 dB. The results with almost all different SNR values are better than the other methods can achieve.",

keywords = "keywords-adaptive transmission, inverse control, FxLMS algorithm, near-far problem, CDMA, programmable control, power control, least squares approximation, interference",

author = "Marko H{\"o}yhty{\"a} and Aarne M{\"a}mmel{\"a}",

year = "2007",

doi = "10.1109/VETECS.2007.619",

language = "English",

isbn = "978-1-4244-0266-3",

booktitle = "2007 IEEE 65th Vehicular Technology Conference",

publisher = "IEEE Institute of Electrical and Electronic Engineers",

address = "United States",

note = "IEEE 65th Vehicular Technology Conference, VTC2007-Spring, VTC2007-Spring ; Conference date: 22-04-2007 Through 25-04-2007",

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TY - GEN

T1 - Adaptive inverse power control using an FxLMS algorithm

AU - Höyhtyä, Marko

AU - Mämmelä, Aarne

N1 - Conference code: 65

PY - 2007

Y1 - 2007

N2 - In this paper, a novel adaptive inverse power control method that is based on the filtered-x LMS (FxLMS) algorithm is introduced. Inverse power control minimizes the interference that a cognitive radio creates to licensed users and allows more users to share the spectrum. It is also needed in multi-access systems like code division multiple access (CDMA) to alleviate the near-far problem. The proposed variable step algorithm adjusts the step size in a nearly optimal way. Based on numerical analysis this new method clearly improves system performance compared to the algorithm where the well-known fixed or variable step adjustment power control is used. A normalized version of the FxLMS algorithm is needed in a fading channel. In a slowly fading channel (e.g., normalized Doppler frequency of 0.001) the FxLMS power control can keep the received signal-to-noise ratio (SNR) in the desired level with a good accuracy most of the time. The standard deviation of the received SNR is 1.92 dB when the received SNR is kept at 10 dB. The results with almost all different SNR values are better than the other methods can achieve.

AB - In this paper, a novel adaptive inverse power control method that is based on the filtered-x LMS (FxLMS) algorithm is introduced. Inverse power control minimizes the interference that a cognitive radio creates to licensed users and allows more users to share the spectrum. It is also needed in multi-access systems like code division multiple access (CDMA) to alleviate the near-far problem. The proposed variable step algorithm adjusts the step size in a nearly optimal way. Based on numerical analysis this new method clearly improves system performance compared to the algorithm where the well-known fixed or variable step adjustment power control is used. A normalized version of the FxLMS algorithm is needed in a fading channel. In a slowly fading channel (e.g., normalized Doppler frequency of 0.001) the FxLMS power control can keep the received signal-to-noise ratio (SNR) in the desired level with a good accuracy most of the time. The standard deviation of the received SNR is 1.92 dB when the received SNR is kept at 10 dB. The results with almost all different SNR values are better than the other methods can achieve.

KW - keywords-adaptive transmission

KW - inverse control

KW - FxLMS algorithm

KW - near-far problem

KW - CDMA

KW - programmable control

KW - power control

KW - least squares approximation

KW - interference

U2 - 10.1109/VETECS.2007.619

DO - 10.1109/VETECS.2007.619

M3 - Conference article in proceedings

SN - 978-1-4244-0266-3

BT - 2007 IEEE 65th Vehicular Technology Conference

PB - IEEE Institute of Electrical and Electronic Engineers

T2 - IEEE 65th Vehicular Technology Conference, VTC2007-Spring

Y2 - 22 April 2007 through 25 April 2007

ER -

Adaptive inverse power control using an FxLMS algorithm

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Keywords

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