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Power control and link adaptation scheme based on multi-user detection

A multi-user and detector technology, applied in the field of signal processing, to achieve the effect of reducing power consumption, saving power, and quickly adjusting

Inactive Publication Date: 2008-03-26
KONINKLIJKE PHILIPS ELECTRONICS NV
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

Although not shown, the MUD further outputs the SNR

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  • Power control and link adaptation scheme based on multi-user detection
  • Power control and link adaptation scheme based on multi-user detection
  • Power control and link adaptation scheme based on multi-user detection

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Embodiment Construction

[0038] According to the average interference P during the reception of previously received frames MeanIF To determine interference. As given in equation (2), P is calculated separately in each station MeanIF Value:

[0039] P MeanIF = P LastIF , P MeanIF = 0 0,75 P MeanIF + 0.25 P LastIF , else - - - ( 2 )

[0040] The in...

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Abstract

This invention provides a method for dynamically adjusting the transmitter power (PTX) and data rate in a communications system. The scheme is specifically intended for wireless systems based on Code Division Multiple Access (CDMA) or on Multiple Input Multiple Output (MIMO) technology, but can be applied to all systems in which a so-called "Multi-User Detector" can be used. The method includes that the decision whether to increase or decrease the transmitter power (PTX) is based on the Signal to Interference plus Noise Ratio (SINR) at the receiver (S2), whereby the receiver (S2) determines the interference (PIF) with a Multi-User Detector. The interference level (PIF) is then communicated to the sender (S1) or alternatively the receiver (S2) determines the optimal transmitter power level (PTX) and communicates this level to the sender (S1). The proposed method reduces the power consumption and increases the performance e.g. in CDMA based systems.

Description

Technical field [0001] The present invention relates to a method for performing signal processing on a wireless local area network (W-LAN) based on multi-carrier code division multiple access (MC-CDMA) according to a power control algorithm. technical background [0002] In a code division multiple access (CDMA) network, the number of simultaneous transmissions can be increased until the signal-to-interference and noise ratio (SINR) at the receiver is reduced to a limit that prevents it from correctly receiving and detecting the desired packet. Therefore, power control plays an important role in system capacity. [0003] MC-CDMA is now receiving more and more attention and has become a promising candidate for future wireless high-capacity communication networks. Multi-carrier technology usually has strong resistance to multipath fading, providing high spectrum efficiency and interference suppression capabilities. MC-CDMA has several other advantages, such as frequency diversity a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/005H04B1/707H04B1/7103H04W52/26H04W52/28
CPCH04W52/262H04W52/286Y02B60/50
Inventor G·奥尔法诺斯J·哈贝塔
Owner KONINKLIJKE PHILIPS ELECTRONICS NV
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