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Calculation method and device for demodulated effective noise in wireless communication

A technology of wireless communication and calculation method, applied in the field of communication, can solve problems such as affecting system performance without considering channel noise, etc., and achieve the effect of improving system performance

Inactive Publication Date: 2012-07-04
HUAWEI TECH CO LTD
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In the prior art, when estimating the noise variance, only the external noise, that is, the additive white Gaussian noise in formula (1), is considered, and the noise introduced during channel estimation is not considered, which affects the performance of the system

Method used

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  • Calculation method and device for demodulated effective noise in wireless communication
  • Calculation method and device for demodulated effective noise in wireless communication
  • Calculation method and device for demodulated effective noise in wireless communication

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Embodiment 1

[0027] figure 2 The implementation flow of the demodulation effective noise calculation method in wireless communication provided by Embodiment 1 of the present invention is shown, and the process of the method is described in detail as follows:

[0028] In step S201, a pilot signal and a data signal are received through an antenna, and channel estimation is performed according to the received pilot signal and data signal to obtain a channel estimation result.

[0029] In the signal transmission model, the transmitted signal is usually composed of a preamble, a pilot signal, and a data signal between the pilot signals. It is assumed that a pilot signal is inserted every F data signals, and two adjacent pilot signals and the The data signal sequence of can be expressed as {r 0 , r 1 , r 2 ,...;r F , r F+1}, where r 0 、r F+1 is the pilot signal, {r 1 ... r F} is the data signal between the pilot signals. The sending signal is transmitted to the receiving end through a...

Embodiment 2

[0065] image 3 It shows the implementation flow of the demodulation effective noise calculation method in wireless communication provided by Embodiment 2 of the present invention, and this embodiment adds step S305 on the basis of Embodiment 2.

[0066] In step S305, when the difference between the demodulated effective noise variances of the two receiving antennas is less than or equal to the preset threshold, the average of the demodulated effective noise variances of the two receiving antennas is obtained to obtain a new Demodulation effective noise variance.

[0067] In this embodiment, the decision threshold is preset, and the threshold decision is made on the demodulation effective noise variance of any two receiving antennas in the multi-antenna receiving system, where the difference between the demodulation effective noise variance of the two receiving antennas is less than or equal to When the threshold is preset, average the demodulated effective noise variance of ...

Embodiment 3

[0069] Figure 4 The structure of the device for calculating demodulation effective noise in wireless communication provided by Embodiment 3 of the present invention is shown. For the convenience of description, only the parts related to the embodiment of the present invention are shown.

[0070] The demodulation effective noise calculation device 4 in wireless communication may be a software unit, a hardware unit or a combination of software and hardware operating in a multi-antenna receiving system (such as WCDMA, TD-SCDMA and other wireless systems).

[0071] The demodulation effective noise calculation device 4 in the wireless communication includes a channel estimation unit 41, a first calculation unit 42, a second calculation unit 43 and an output unit 44, and its specific functions are as follows:

[0072] The channel estimation unit 41 is used to receive the pilot signal and data information through the antenna, and perform channel estimation according to the received ...

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Abstract

The invention is suitable for the communication field, which provides a calculation method and a device for demodulated effective noise in wireless communication. The method comprises the following steps of: receiving an antenna receiving pilot frequency signal and a data signal; according to the received pilot frequency signal and data signal, carrying out channel estimation to obtain a channel estimation result; according to the channel estimation result and the pilot frequency signal, calculating an additive white Gaussian noise variance; according to a Wiener filtering factor in the channel estimation result and the calculated additive white Gaussian noise variance, calculating a mean square error introduced by channel estimation; and outputting the sum of the additive white Gaussian noise variance and the mean square error as an effective demodulated noise variance. When the demodulated effective noise is calculated with the calculation method, an external noise variance is considered, and the mean square error introduced by the channel estimation is also considered, so that the calculation result is closer to a real system model, and system performance is effectively improved.

Description

technical field [0001] The invention belongs to the technical field of communication, and in particular relates to a calculation method and device for demodulation effective noise in wireless communication. Background technique [0002] In a wireless communication system, the signal received by the receiving antenna can be expressed as: [0003] y=Hx+n (1) [0004] Among them, y, x and n are column vectors of N×1, M×1 and N×1 respectively, H is an N×M channel matrix in the frequency domain (N and M are the number of antennas at the UE side and the base station side respectively), and y , x and n denote the received symbol vector at the UE, the transmitted symbol vector at the base station and the additive white Gaussian noise vector, respectively. [0005] Usually, it is necessary to perform noise measurement or noise variance estimation on the received signal in the channel, that is, to estimate n in formula (1). Existing technologies such as figure 1 As shown, the nois...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L25/02H04L25/03
Inventor 雷立辉
Owner HUAWEI TECH CO LTD
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