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Method for estimating channel impulse response

A channel impulse response and initial estimation technology, applied in the field of mobile communications, can solve the problems of not considering the impact of noise on the channel impulse response, high computational complexity, and difficulty in accurately determining the channel dispersion length, etc., so as to improve balanced demodulation performance effect

Inactive Publication Date: 2011-05-25
GLOBAL INNOVATION AGGREGATORS LLC
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Problems solved by technology

[0008] The technical solutions of the above patents either do not take into account the impact of noise on the channel impulse response, or the computational complexity is relatively high, or it is difficult to accurately determine the actual dispersion length of the channel

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Embodiment Construction

[0029] The specific implementation of the method of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0030] The invention first uses the least square method to initially estimate the channel impulse response, and then eliminates the paths considered to be noise through noise suppression processing. The noise suppression process includes two steps: firstly, eliminate the paths whose energy is lower than a certain threshold in the channel impulse response, and then estimate the noise variance according to different channel impulse response orders L, and select the order with the smallest noise variance as the final The actual channel dispersion length M, and finally the path from M+1 to the maximum impulse response order will be eliminated as the noise path. Compared with the traditional method, under the premise of meeting the EDGE protocol specification, this method can suppress the influence of noise on the chann...

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Abstract

The invention provides an estimation method for channel impulse response, which is used in the mobile communication system and includes the following steps: (a) the channel impulse response is estimated initially h(i), i = 0...N-1, (b) the energy of the N paths of the channel impulse response is calculated, wherein the energy maximum is En_Max and energy threshold value is En_Max / T, wherein T is more than 1, If the path energy in the channel impulse response is less than the energy threshold value, the path is set as a noise path and the channel impulse response value corresponding to the path is cleared, (c) channel impulse response estimation value h(i)(i = 0, ...L-1) is obtained to estimate noise variance according to different channel impulse response orders L, wherein the value of L is [Lstart, N], Lstart is an integer less than or equal to N, (d) the L value corresponding to the smallest noise variance is taken as the dispersion length M of the channel, and the channel impulse response value from path M+1 to path N is cleared. Compared with the traditional method, the invention can inhibit the influence of noise on channel impulse response estimation and consequently improve balanced demodulation performance.

Description

technical field [0001] The invention belongs to the field of mobile communication, and in particular relates to a noise-suppressing channel impulse response estimation method suitable for an EDGE (Enhanced Datarates for GSM Evolution, Enhanced Datarates for GSM Evolution) system. Background technique [0002] GSM (Global System for Mobile Communications), as the second generation mobile cellular communication system, has been widely used all over the world. However, with the development of mobile communication technology and the diversification of services, people's demand for data services continues to increase. In order to provide a higher data communication rate in the existing GSM cellular system, the EDGE system introduces a multi-level digital modulation method - 8PSK (eight-phase phase-shift keying) modulation. Since 8PSK modulation maps 3 consecutive bits to one symbol of I / Q coordinates, it can provide higher bit rate and spectral efficiency. The EDGE system can p...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04W84/02H04B7/26H04B17/00H04L25/02
CPCY02B60/50
Inventor 熊岗单淑伟刘涛柯昌伟康健
Owner GLOBAL INNOVATION AGGREGATORS LLC
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