Channel delay measurement method and device
A technology of channel delay and measurement method, applied in baseband system components, multi-frequency code systems, etc., can solve the problems of inaccurate channel time domain impulse response, affecting receiver performance, large delay error, etc., to reduce Effects of energy leakage, performance improvement, and multipath channel delay
Active Publication Date: 2016-03-09
LEADCORE TECH
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Although this has a certain inhibitory effect on energy leakage, it will still cause large energy leakage and make the time-domain impulse response of the channel inaccurate, resulting in a large error in the measured time delay, which will affect the performance of the receiver.
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[0022] The following embodiments of the present invention describe a channel delay measurement method, which is applicable to various Orthogonal Frequency Division Multiplexing (OFDM) systems and Multiple Input Multiple Output-Orthogonal Frequency Division Multiplexing (MIMO-OFDM) systems, For example a Long Term Evolution (LTE) system. This method can be implemented in an OFDM system receiver with virtual subcarriers, so as to estimate the time delay value of multipath channel more accurately.
[0023] For the receiver, since the transmitted signal at the position of the reference signal is known, it is assumed that If the frequency domain channel impulse response of each reference signal position is expressed as but:
[0024] H ^ LS ( r , p ) = r ~ ...
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The invention relates to a measuring method and a measuring device for channel time delay. The method comprises the steps that frequency domain channel response is extracted from a plurality of subcarriers of a channel; whether positions of the subcarriers are positions where reference signals are located is judged; if the positions of the subcarriers are the positions where the reference signals are located, the corresponding frequency domain channel response is extracted from channel estimation directly, and merged; if the positions of the subcarriers are not the positions where the reference signals are located, whether the subcarriers are subcarriers in system bandwidth is judged; if the subcarriers are the subcarriers in the system bandwidth, the frequency domain channel response at the reference signals closest to the subcarriers is approximated, and merged; and if the subcarriers are not the subcarriers in the system bandwidth, the frequency domain channel response at the reference signals at the two ends of the system bandwidth is utilized to conduct linear interpolation. Therefore, the measuring method and the measuring device can better estimate the multipath channel time delay.
Description
technical field [0001] The invention relates to a mobile communication system, in particular to a method and device for measuring channel delay in the mobile communication system. Background technique [0002] In various mobile communication systems, channel estimation information has a relatively large impact on the receiving performance, and the delay measurement value of the multipath channel has a greater influence on the channel estimation value of the multipath channel. Therefore, if the time delay value of the multipath channel can be accurately estimated, the channel estimation value will be more accurate, thereby improving the performance of the receiver. Taking the Long-Term Evolution (LTE) system as an example, the LMMSE (LinearMinimumMeanSquareErrorestimation, Linear Minimum Mean Square Error Estimation) algorithm is often used for LTE downlink channel estimation. The channel estimate at the location, and then use the MMSE (Minimum Mean Square Error) algorithm t...
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IPC IPC(8): H04L27/26H04L25/02
Inventor 廖伟康国庆邓瑞楠
Owner LEADCORE TECH