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Method for realizing controlling FDD-long term evolution (LTE) physical downlink shared channel (PDSCH) power in DSP

A technology for power control and mobile communication system, which is applied in the field of downlink PDSCH power control, and achieves the effects of small calculation amount, simple power control method, and shortened implementation time.

Active Publication Date: 2014-07-30
WUHAN POST & TELECOMM RES INST CO LTD
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

But the existing problem is: how to reduce the complexity of power control to complete the power control operation in a shorter time

Method used

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  • Method for realizing controlling FDD-long term evolution (LTE) physical downlink shared channel (PDSCH) power in DSP
  • Method for realizing controlling FDD-long term evolution (LTE) physical downlink shared channel (PDSCH) power in DSP
  • Method for realizing controlling FDD-long term evolution (LTE) physical downlink shared channel (PDSCH) power in DSP

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Embodiment Construction

[0024] The present invention will be described in detail below in conjunction with the accompanying drawings.

[0025] figure 2 It is the method of implementing FDD-LTE downlink PDSCH power control in DSP in the present invention. The basis of this embodiment is: 20M bandwidth, two antennas, one UE occupies 12 RBs, mapped to 1440 REs, QPSK modulation, PA and PB The parameters of are given by the upper layer.

[0026] According to step 1, two modulation tables are generated for PA and PB. The size of each table is 16*4=64 values, 2880 bits are QPSK look-up table modulation every 4 bits, and 1440 modulations are obtained corresponding to PA and PB respectively. The sign, the imaginary part and the real part are represented separately, that is, the modulated data corresponding to PA and PB are each 2880 values.

[0027] According to step 2, a precoding operation is performed, wherein the modulated original data is transmitted on the first antenna port, and the complex conjugat...

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Abstract

Method for simplifying physical downlink shared channel (PDSCH) power control in a DSP and an apparatus thereof are disclosed. The method comprises the following steps: 1. generating two modulation tables corresponding to a PA and a PB, and respectively performing PA and PB look-up table modulation to data which needs to be modulated; 2. respectively taking the data of the modulated PA and PB according to a precoding matrix; 3. according to whether there is a cell-specific reference signal (CRS) in an orthogonal frequency division multiplexing (OFDM) symbol in which a mapped resource element (RE) is located, taking the data to be mapped in a parameter list corresponding to the PA and the PB. The power control method provided in the invention is simple. Computation quantity is small. Realization time is shortened. Using the method is convenient for the DSP to realize. Power control operation of the PDSCH in the DSP can be realized and a signal after being power controlled is performed mapping.

Description

technical field [0001] The present invention relates to a method for controlling downlink PDSCH power in the third generation mobile communication long-term evolution system (hereinafter referred to as 3G LTE), and in particular to a method for realizing FDD-LTE downlink PDSCH power control in DSP. Background technique [0002] Power control is an important function in cellular mobile communications. Function control keeps the signal power received by the receiving end within an appropriate range, which not only compensates for channel fading, but also ensures that the transmission power will not be too large and affect the normal communication of users. It is one of the important measures to improve the performance of cellular systems one. The goal of downlink power control in the LTE (Long Term Evolution, Long Term Evolution) system is to reduce the transmission power of the downlink channel as much as possible on the premise of satisfying the user's reception quality, so...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/26H04W52/14H04W52/42H04B7/06
Inventor 程斯陈亮明张艳欢周祖望
Owner WUHAN POST & TELECOMM RES INST CO LTD
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