Method and device for deciding closed loop emission diversity feedback bits of CDMA system

A closed-loop transmission and feedback bit technology, applied in the field of wireless communication, can solve the problems of inability to effectively suppress the amplification of channel estimation errors, difficult judgment results, etc., to reduce parameter sensitivity, reduce sensitivity, and increase the probability of correct judgment. Effect

Inactive Publication Date: 2009-06-24
HUAWEI TECH CO LTD
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Problems solved by technology

[0030] Existing decision technologies are all based on linear smoothing and filtering methods for signals, which cannot effectively suppress the amplification of errors caused by nonlinear operations in channel estimation and calculation of arguments.
In this way, due to the influence of noise that must exist in the actual system, the noise is amplified in the channel estimation and decision methods, and it is not easy to obtain accurate decision results

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  • Method and device for deciding closed loop emission diversity feedback bits of CDMA system
  • Method and device for deciding closed loop emission diversity feedback bits of CDMA system
  • Method and device for deciding closed loop emission diversity feedback bits of CDMA system

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Embodiment Construction

[0056] The specific implementation manners of the present invention will be described below in conjunction with the accompanying drawings.

[0057] The device of the present invention is as attached Figure 4 As shown, it includes a first adder 43 , a second adder 44 , a first accumulator 45 , a second accumulator 46 , first calculation modules 411 to 41N, second calculation modules 421 to 42N, and a selection decision module 47 .

[0058] Wherein the first calculation modules 411 to 41N obtain the first calculation results of the pilot symbols of the path according to the physical parameters of the pilot symbols of the input system and path, and output the result to the first adder 43;

[0059] The second calculation modules 421 to 42N obtain the second calculation result of the pilot symbol of the path according to the physical parameters of the pilot symbol of the input system and path, and output the result to the second adder 44;

[0060] The first adder 43 sums the resu...

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Abstract

The invention relates to the field of wireless communication, in particular to a judgment method and a device for closed-loop transmission diversity feedback bits in a CDMA system. The method of the present invention obtains the first calculation result and the second calculation result of all the pilot symbols of all paths through the physical parameters of the pilot symbols of the system and paths; and then accumulates the first calculation results of all the pilot symbols of all paths to obtain The first decision parameter is to accumulate the second calculation results of all pilot symbols of all paths to obtain the second decision parameter; finally obtain the feedback information (FeedbackInformation, FBI) ​​value according to the first decision parameter and the second decision parameter; the present invention A CDMA system closed-loop transmit diversity feedback bit decision device, comprising a first adder, a second adder, a first accumulator, a second accumulator, a first calculation module and a second calculation module corresponding to each pilot symbol, Select the decision module, etc. The method of the invention can effectively control the influence of the noise on the judgment result, and can obtain the feedback bits that can reach the controllable weight under the noise condition.

Description

technical field [0001] The invention relates to the field of wireless communication, in particular to a judgment method and a device for closed-loop transmission diversity feedback bits in a CDMA system. Background technique [0002] Due to the serious multipath fading in the mobile communication environment, it affects the reliability of system information transmission. One of the effective technologies to improve reliability is to introduce diversity technology at the receiver. However, due to limitations in volume, price, and battery capacity of mobile stations, space diversity with multiple antennas is almost infeasible. [0003] If the wireless channel is approximately regarded as a time-varying linear system, the equivalent transformation of the linear system can be used to realize equivalent antenna (receiving) diversity at the receiving end to antenna (transmitting) diversity at the transmitting end. [0004] For CDMA working in the 2000MHz frequency band and the di...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04J13/02H04B7/02H04B7/005H04B1/76H04W52/08
Inventor 吴涛
Owner HUAWEI TECH CO LTD
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