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Load estimation in frequency domain pre-equalization systems

A pre-equalization, wireless communication system technology, applied in the field of cellular communication systems using interference whitening, can solve the problems of noise rise estimation, rise estimation, interference, etc.

Active Publication Date: 2013-02-13
TELEFON AB LM ERICSSON (PUBL)
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, contrary to the effectiveness for interference cancellation based on regeneration and subtraction, the interference reduction obtained by FDPE processing changes the thermal noise floor in the same way and can no longer be seen as constant after interference whitening
Therefore, a similar treatment of WO 2008 / 097145 cannot be used to achieve noise rise estimation, since WO 2008 / 097145 requires the noise floor to be constant
Because there is no reliable estimate of noise rise available, there is a problem with using the reduced interference created

Method used

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  • Load estimation in frequency domain pre-equalization systems
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  • Load estimation in frequency domain pre-equalization systems

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Embodiment Construction

[0022] Throughout the disclosure, boldface in equations indicates vector or matrix quantities.

[0023] In the drawings, corresponding reference numerals are used for similar or corresponding parts.

[0024] The present invention relates to devices and methods in wireless communication systems. figure 1 A schematic diagram of an embodiment of such a wireless communication system 150 is shown. The radio base station 160 communicates via its antenna 39 with a plurality of user equipments (UEs) 170 located in a cell 151 of the wireless communication system 150 . A radio signal transmitted from RBS 160 to UE 170 is denoted as downlink signal 181 , and a radio signal transmitted from UE 170 to RBS 160 is denoted as uplink signal 180 . The present invention primarily considers uplink signals, whereby typically no means are provided in the RBS 160 for noise rise estimation. In addition to the intended uplink signal 180, the RBS 160 also receives interfering signals 182,183.

[00...

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Abstract

An arrangement (10) for noise rise estimation comprises a front end signal conditioning arrangement (9) and an interference whitener (14) connected thereto. The interference whitener (10) is arranged for providing interference whitening of a front end signal. A processor (20) is arranged for measuring received total wideband power received at the front end signal conditioning arrangement (9) a plurality of times. An estimate of a noise floor measure is computed by the processor (20) based on the measured received total wideband powers. The processor (20) determines an equivalent total wideband power of the output from the interference whitener (14). The processor (20) also calculates a noise rise measure, based on the equivalent total wideband power and the noise floor measure, and compensates the noise rise measure for the interference whitening. A digital receiver (12) is connected to the output from the interference whitener (14).

Description

technical field [0001] The present invention relates generally to methods and apparatus for estimating power-related quantities in cellular communication systems, and in particular to such methods and apparatus in cellular communication systems using interference whitening. Background technique [0002] Wideband Code Division Multiple Access (WCDMA) telecommunication systems have many attractive properties for the development of future telecommunication services. In order to keep the cell stable, the load needs to be kept below a certain level. This rule is followed because most uplink user channels (at least in WCDMA) are power controlled. The purpose of this power control is to maintain the received power level of each channel at a specific signal-to-interference ratio (SIR) in order to be able to meet specific service requirements. [0003] As the radio base station (RBS) strives to keep each channel at its preferred SIR value, it may occur that additional users or burs...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W24/08H04W52/24H04W52/30H04L25/03
CPCH04B17/0062H04B17/0045H04B17/0055H04B17/005H04B17/007H04B17/21H04B17/26H04B17/327H04B17/345
Inventor 阿里·康加斯卡尔·托尔比约恩·维格伦
Owner TELEFON AB LM ERICSSON (PUBL)
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