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Device and method for estimating downlink channel power offset

A channel power and channel technology, applied in the field of wireless communication, can solve problems such as influence and achieve the effect of accurate estimation

Active Publication Date: 2009-10-21
SANECHIPS TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the downlink channel standards of HSDPA and HSUPA mentioned above only state that the energy of these channels is regulated by power control, but no specific requirements are given. Therefore, the UE needs to estimate the energy offset of these channels, and the above-mentioned Various influencing factors in channel energy measurement will also affect the estimation of channel energy offset

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  • Device and method for estimating downlink channel power offset
  • Device and method for estimating downlink channel power offset

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Embodiment Construction

[0026] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0027] like figure 1 The above is a schematic diagram of the device of the present invention, the channel energy output module A is used to estimate the channel energy and output the pilot channel energy according to the current channel symbol received by TTI; the DTX state judgment and history record module B is used to judge DTX status and historical records of the channel; the channel power offset estimation and output module C is used to calculate the channel power offset and output the calculation result.

[0028] The current energy measurement of the pilot channel usually calculates the current symbol energy after descrambling and despreading. The current energy estimate of the pilot channel is then obtained using one of the following two methods:

[0029] Method 1: Obtain the current energy estimate of the pilot channel after averaging multiple symbo...

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Abstract

The invention relates to a device and a method for estimating downlink channel power offset. A channel energy output module estimates the current channel energy; a discontinuous emission state judgingand history recording module judges whether transmission exists in the channel; when transmission exists in the channel, discontinuous emission state endurance time is accumulated, or else, the accumulated discontinuous emission state endurance time is transmitted to a channel power offset estimation and output module, the discontinuous emission state endurance time is cleared, the channel poweroffset estimation and output module calculates the current transmission module time interval channel power offset measurement value and the current transmission module time interval channel power offset value, and the estimation result is output and preserved. The invention overcomes the impact of accidental deviation caused by noise, discontinuous emission and the like to a system in the power offset estimation of a downlink channel of high speed downlink data access and high speed uplink data access.

Description

technical field [0001] The present invention relates to the field of wireless communication, in particular to a device and a method for estimating certain downlink channel power offsets of high-speed downlink data access (HSDPA) and high-speed uplink data access (HSUPA) by a terminal in a WCDMA system. Background technique [0002] In the terminal of WCDMA wireless communication system, it is necessary to measure the energy of some downlink channels to facilitate demodulation; for example, the 16-QAM modulated HS-DSCH channel in HSDPA, the downlink channels E-HICH and E-RGCH in HSUPA. However, since the transport block time interval (TTI) of these channels may only be 2ms, and due to the time requirements for decoding, it may not be possible to use the entire TTI to estimate; in addition, the channel itself may be discontinuously transmitted (DTX); so only this The measurement of TTI is likely to cause an inaccurate estimation and affect performance. If we can obtain the po...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/005H04B7/26
Inventor 朱晓明杜凡平
Owner SANECHIPS TECH CO LTD