Estimation method and device for multi-district united channel

A technology of joint channel estimation and channel estimation, applied in the field of multi-cell joint channel estimation, can solve the problems of reducing joint detection performance and affecting the quality of channel estimation, etc.

Active Publication Date: 2009-07-29
SPREADTRUM COMM (SHANGHAI) CO LTD
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  • Application Information

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Problems solved by technology

However, in the case of interference from cells of the same frequency, if the above method is used for channel estimation for each cell, the quality of channel estimation will be seriously affected due to the existence of interference, and the performance of joint detection will be reduced.

Method used

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  • Estimation method and device for multi-district united channel
  • Estimation method and device for multi-district united channel
  • Estimation method and device for multi-district united channel

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no. 1 example

[0105] Please refer to FIG. 1, the multi-cell joint channel estimation device 100 according to the first embodiment of the present invention includes a pilot signal extractor 101, a signal memory 102, a signal canceller 103, a plurality of single-cell channel estimators 104, a main path Extractor 105 , channel accumulator 106 , main path pilot signal reconstructor 107 , noise estimator 108 and noise reduction processor 109 .

[0106] refer to figure 2 1, the multi-cell joint channel estimation method according to the first embodiment of the present invention includes the following steps:

[0107] Step S201, the pilot signal extractor 101 intercepts the training sequence signal r=[r from the received signal 1 , r 2 ,...,r P ] T , where P is the length of the training sequence; this training sequence signal can be stored in the signal memory 102;

[0108] Step 202, the device 100 performs channel estimation initialization, including setting the number of iterations N, and t...

no. 2 example

[0117] Referring to the device 300 shown in Figure 3 and figure 2 Describe the second embodiment of the present invention, the estimation method of this embodiment is basically the same as the same steps in the first embodiment, the only difference is that in step 207 of this embodiment, the signal canceller 303 is from the initial received Eliminate the influence of the main path signal in the training sequence signal r, that is, according to the formula r ( i + 1 ) = r - Σ j = 1 J M j h ~ j Get a new training sequence signal r (i+1) , where the main path pilot signal reconstructor 307 obtains the updated channel estimation values ​​of each...

no. 3 example

[0119] Please refer to Figure 4 and Figure 5 As shown, in the third embodiment, the process of embedding the noise reduction processing into the iterative operation, this embodiment includes the following steps:

[0120] Step 501, the pilot signal extractor 401 intercepts the training sequence signal r=[r from the received signal 1 , r 2 ,...,r P ] T , where P is the length of the training sequence; this training sequence signal can be stored in the signal memory 102 .

[0121] Step 502, the multi-cell joint channel estimation device 400 performs channel estimation initialization, including setting the number of iterations N, and the main path selection threshold λ for each iteration 1 ,λ 2 ,...,λ N , channel noise reduction threshold γ, initial channel estimate h ~ = 0 JP × 1 , of which 0 JP×1 Represents a column vector of l...

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Abstract

The invention discloses a method for estimating a multi-cell joint channel and a device thereof, which can effectively reduce multi-access interference interfering a user or a base station and improve the detection performance of a receiver. The method mainly comprises the following steps: training sequence signals are intercepted from receiving signals; a single cell channel estimation method isused for estimating channels of all cells with same frequency; then iterative operation is used for calculating estimation value of a main path with larger intensity in sequence; the influence of themain path signals are eliminated from the training sequence signal in sequence; and finally, the combination of the main paths is taken as the channel estimation result, wherein, a zero-forcing algorithm is adopted to carry out channel estimation of the main path. In addition, the method also can carry out noise reduction processing to the channel estimation result.

Description

technical field [0001] The present invention relates to channel estimation in a wireless communication system, in particular to a multi-cell joint channel estimation method and device. Background technique [0002] In a wireless communication system, due to the reflection and refraction characteristics of electromagnetic waves and the complexity of the communication environment, the propagation path between the transmitter and the receiver is very complicated, resulting in the signal received by the receiving end usually coming from multiple propagation paths The superposition of signals, and the amplitude and phase of each path signal vary with time and space. This phenomenon is called multipath fading of wireless channels, and multipath fading is the main feature of mobile channels. The existence of multipath leads to inter-symbol interference (Inter-Symbol Interference, ISI). In addition, for wireless communication systems based on Code Division Multiple Access (CDMA), d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B1/707H04L25/02
Inventor 张爱民程健刘威鑫
Owner SPREADTRUM COMM (SHANGHAI) CO LTD
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