Channel estimating method and device

Abstract

The embodiment of the invention discloses a channel estimating method and device and relates to the field of modern wireless communication so as to solve the problem of inaccurate channel estimation under the condition that the channel environment is case 2 in the specification in the prior art. In a technical scheme provided by the invention, the method comprises the following steps of: receiving signals in advance according to a preset code length; analyzing a training sequence of the signals received in advance and the training sequence of signals which are not received in advance from the signals received in advance; respectively calculating a first channel impulse response and a second channel impulse response correspondingly according to the training sequence of the signals received in advance and the training sequence of the signals which are not received in advance; and selecting one of the first channel impulse response and the second channel impulse response to be used as a final channel impulse response according to preset selection rules. The technical scheme provided in the invention can be applied in the technical field of the channel estimation in a TD-SCDMA (Time Division-Synchronization Code Division Multiple Access) system.

Description

technical field [0001] The present invention relates to the field of modern wireless communication, in particular to a method and device for channel estimation. Background technique [0002] In a Time Division-Synchronous Code Division Multiple Access (TD-SCDMA) system, in order to reduce multiple access interference, a joint detection technique is used to distinguish multiple users. In joint detection technology, channel estimation is the basis, and the accuracy of channel estimation directly affects the performance of joint detection. In the TD-SCDMA system, channel estimation is performed through the midamble code of the transmitted training sequence. This method requires precise symbol synchronization. The better the synchronization accuracy, the more accurate the channel estimation. However, in the actual communication environment, due to the influence of factors such as multipath fading, synchronization errors usually occur, which will seriously affect the accuracy of...

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Problems solved by technology

[0004] In the process of realizing the present invention, the inventors found that since the delay of the third path of the channel environment case2 is about 16 chip lengths, that is, 16chips, when the channel environment is case2 and the window length of the received signal is 16chips, if Using the scheme of receiving signals in advance, the signal in the third path of case2 will exceed the window of the received signal, making the received signal inaccurate, so that the channel estimation using this signal is also inaccurate

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