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Method and device for acquiring channel information

A channel information and channel technology, applied in the field of obtaining channel information, can solve the problems of occupying time-frequency resources, increasing the computational burden of the receiving end, etc., to achieve the effect of reducing processing complexity

Inactive Publication Date: 2009-11-04
HUAWEI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The purpose of the embodiments of the present invention is to provide a method and device for obtaining channel information, so as to solve the problems of the existing technical solutions that need to increase the calculation burden of the receiving end and need to occupy special time-frequency resources.

Method used

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  • Method and device for acquiring channel information
  • Method and device for acquiring channel information

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Embodiment 1

[0035] Embodiment 1. In this embodiment, multiple terminals multiplex uplink pilots in a CDM (CODE DIVISION MULTIPLEXING, Code Division Multiplexing) manner, and the uplink pilots of each terminal are orthogonal to each other. The processing procedure of the base station transmitting data in this embodiment is as follows figure 2 As shown, the specific process is as follows:

[0036] The base station first performs code modulation and pre-equalization processing on the signal to be transmitted, inserts downlink pilots in the frequency domain of the processed signal, and then performs OFDM (orthogonal frequency division multiplexing) modulation on the signal, adding CP (Cyclic Prefix, cyclic prefix), it is transmitted through the physical transmission channel.

[0037] The process of receiving and processing signals by the terminal in this embodiment is as follows: image 3 As shown, the specific process is as follows:

[0038] The data transmitted by the base station is re...

Embodiment 2

[0107] Embodiment 2, this embodiment is mainly to reduce the destruction of pilot orthogonality due to frequency selective fading. When the bandwidth is greater than the coherent bandwidth, different frequency points present different fading characteristics after the signal experiences the broadband wireless physical channel, so that Each part of the signal experiences different attenuation, causing frequency selective fading.

[0108] A process for estimating the uplink channel and the downlink channel provided by this embodiment is as follows:

[0109] 1. The base station generates downlink pilots, performs Fourier transform processing on the downlink pilots, and then performs subcarrier mapping and IFFT transformation processing, and then transmits them after OFDM modulation and CP addition.

[0110] 2. The downlink pilot sent by the above base station is received by the terminal. After removing CP and OFDM demodulation, the terminal multiplies the obtained downlink pilot b...

Embodiment 3

[0113] Embodiment 3, this embodiment is mainly to reduce the destruction of pilot orthogonality caused by different uplink and downlink scrambling codes. A process for estimating the uplink channel and the downlink channel provided by this embodiment is as follows:

[0114] 1. The base station generates downlink pilots, performs Fourier transform processing on the downlink pilots, and then performs subcarrier mapping and IFFT transformation processing. Then, after OFDM modulation, adding CP, scrambling with downlink user scrambling codes, and then transmitting go out.

[0115] 2. The downlink pilot sent by the above base station is received by the terminal, and the terminal descrambles the downlink scrambling code, removes CP, OFDM demodulates the downlink pilot, scrambles with the uplink user scrambling code, and multiplies it by an orthogonal code , is superimposed with the uplink pilot processed by the Fourier transform to obtain a mixed pilot, and the terminal transmits t...

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Abstract

The invention provides a method and a device for acquiring channel information. The method mainly comprises the following steps that: a transmitting terminal sends downlink pilot frequency information to a receiving terminal and receives a mixed pilot frequency returned by the receiving terminal, wherein the mixed pilot frequency is acquired by multiplying the received downlink pilot frequency by an orthogonal code and then superimposing the result with an uplink pilot frequency by the receiving terminal, and the orthogonal code only corresponds to the receiving terminal; and the transmitting terminal performs estimation on uplink channel information according to uplink pilot frequency information in the mixed pilot frequency, and performs estimation on downlink channel information of the receiving terminal according to the estimated uplink channel information and downlink pilot frequency and orthogonal code information in the mixed pilot frequency. By using the method and the device, the transmitting terminal can accurately acquire the uplink and downlink channel information under the condition of not increasing extra feedback signaling overhead.

Description

technical field [0001] The present invention relates to the field of wireless communication, in particular to a method and device for acquiring channel information. Background technique [0002] A schematic diagram of the transmission and reception process of a wireless communication system is shown in figure 1 shown. In a wireless communication system, the transmitted signal is affected by the physical transmission channel during transmission, and fading and distortion will occur. In order to recover the transmitted signal, the receiving end usually needs to estimate the physical transmission channel and eliminate the physical transmission channel through equalization processing. influence on the transmitted signal. The effect of the above equalization processing is affected by noise. For example, the zero-forcing equalizer will cause noise amplification in the case of a low signal-to-noise ratio, and the MMSE (Minimum Mean Square Error, minimum mean square error) equaliz...

Claims

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Application Information

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IPC IPC(8): H04L25/03H04L25/02H04B1/707
Inventor 孙铭扬杨云松常欣
Owner HUAWEI TECH CO LTD
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