Method of estimating power of interference signal code

A technology of interference signal code and power, which is applied in the field of estimating the interference signal power of the intermediate pilot received signal, can solve the problems of estimation value deviation, failure to obtain power estimation value, and influence on interference signal code power estimation accuracy, etc., and achieve high accuracy Effect

Inactive Publication Date: 2004-09-08
BEIJING SAMSUNG TELECOM R&D CENT +1
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Problems solved by technology

[0006] When the received signal of the useful user is completely orthogonal to the interference signal, the method proposed in this patent can provide more accurate interference estimation, but due to the fact that the intermediate pilot sequence itself of each user is not completely orthogonal and the existence of multipath In the propagation environment, the orthogonality between the useful user signal and the interference signal cannot be guaranteed, which affects the estimation accuracy of the code power of the interference signal, and even produces a large power estimation deviation
In fact, the impact of this non-orthogonality is particularly serious in the case of high SNR / SIR, and the deviation of its estimated value increases with the increase of high SNR / SIR, making even In the case of high signal-to-noise ratio / high signal-to-interference ratio, the correct power estimate cannot be obtained

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  • Method of estimating power of interference signal code

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no. 1 example

[0103] The first embodiment of the present invention, as shown in Figure 2, comprises the following steps:

[0104] 1. First, eliminate the influence of the data segment on the intermediate pilot received signal, thereby generating a new set of intermediate pilot received signals;

[0105] assume e new Represents the mid-pilot received signal after eliminating the influence of the data segment, referred to here as the new mid-pilot received signal, where the first (W-1) elements of the new mid-pilot received signal are the same as the original mid-pilot received The signals are different, and other elements are the same as the elements at the corresponding positions of the original mid-pilot received signal, so the new mid-pilot received signal can be expressed as

[0106] e ¯ new = ( e ¯ ...

no. 2 example

[0120] In the second step above, the pilot convolution matrix can be extended to a general form. The general form of the pilot convolution matrix differs from the original pilot convolution matrix in that: the general pilot convolution matrix G m，general The columns of is not less than the columns of the original pilot convolution matrix G m , while the columns of the latter must be included in the former. Since the intermediate pilot signals of different users are constructed by cyclically shifting the same basic pilot sequence, the constructed cyclic offset is determined by the maximum allowable number set by the system. When the number of intermediate pilot sequences currently existing in the system is equal to the maximum allowable number, the general pilot convolution matrix G m，general with G m is consistent. That is to say, even if some intermediate pilot sequences do not exist at the present moment, we can still pretend that these intermediate pilot sequences ...

no. 3 example

[0138] The method for the third implementation example is shown in Figure 4, and its specific steps are as follows:

[0139] 1. First eliminate the influence of the data part on the received signal of the intermediate pilot, thereby obtaining a new set of received signals of the intermediate pilot;

[0140] assume e new Represents the received mid-pilot signal after eliminating the influence of the data segment, referred to here as the new mid-pilot received signal, where the first (W-1) elements of the new mid-pilot received signal are the same as the original mid-pilot received signal different, other elements are the same as the elements at the corresponding positions of the original intermediate pilot received signal, then the new intermediate pilot received signal can be expressed as:

[0141] e ¯ new = ( e ¯ ...

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Abstract

The method of estimating power of interference signal code in CDMA mobile communication system includes the following steps: eliminating the interference of data segment on the middle pilot frequency receiving signal; constituting and eliminating convolution matrix corresponding to the middle pilot frequency receiving signal influenced by the data segment; calculating the null space of the pilot frequency convolution matrix; and calculating estimated power of interference signal code. The present invention can raise the accuracy of estimated power of interference signal code, and the estimation deviation will not alter with the altering SIR.

Description

technical field [0001] The present invention relates to a method for estimating the code power of an interference signal in a mobile communication system, more specifically, to a method for estimating the power of an interference signal by using an intermediate pilot received signal in a time division duplex code division multiple access system. Background technique [0002] Time Division Duplex Code Division Multiple Access (TD-CDMA) is a wireless transmission technology scheme proposed by the third-generation mobile communication system standardization organization. It is designed for symmetrical and asymmetric third-generation mobile communication services in all wireless environments. of. Time-division duplex code-division multiple access can support flexible time-domain up / downlink switching on each radio frequency carrier. The time-domain adaptive resource allocation in the transmission direction can achieve the best utilization rate of the spectrum allocation indepen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L25/02H04B1/76H04B7/005H04B17/327H04B17/345H04L25/03H04L27/26
Inventor 范涛王平
Owner BEIJING SAMSUNG TELECOM R&D CENT
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