Frequency offset estimation method and device
A technology of frequency offset estimation and frequency offset value, applied in the field of communication, can solve problems such as poor frequency offset estimation accuracy, and achieve good frequency offset compensation effect
Active Publication Date: 2014-03-19
NANJING ZHONGXING SOFTWARE
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Problems solved by technology
[0004] When the speed of high-speed trains such as maglev reaches 430Km / h, the corresponding maximum Doppler frequency offset can reach nearly 2000Hz. If the current random access frequency offset estimation and compensation method is used, the three preset frequency offsets can no longer meet the needs. , even if more frequency offsets are preset, such as preset 7, the accuracy of frequency offset estimation is still poor
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[0024] In the embodiment of the present invention, the second frequency offset value adjacent to the first frequency offset value is determined through the first frequency offset value corresponding to the maximum value of the maximum amplitude and delay distribution, and the first frequency offset value is adjusted according to the second frequency offset value Adjustment is performed to obtain a more accurate frequency offset estimation value, so as to better perform frequency offset compensation.
[0025] see figure 1 , the main method flow of frequency offset estimation in this embodiment is as follows:
[0026] Step 101: Obtain the maximum value of the amplitude and delay distribution of the captured preamble signal at each preset frequency offset value. In this embodiment, the preamble signal may specifically be a signal obtained by repeating a specified preamble signature 256 times and multiplying it by a scrambling code.
[0027] Step 102: Determine a first frequency...
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The embodiment of the invention relates to a frequency offset estimation method and a device, which are used for realizing and obtaining quite accurate frequency offset value, so as to improve the frequency offset compensation effect. The method comprises the following steps that: the maximum amplitude time delay distribution value of a captured leading signal on all preset frequency offset values is obtained; a first frequency offset value corresponding to the maximum amplitude time delay distribution value in a plurality of maximum amplitude time delay distribution values is determined; the first frequency offset value is adjusted according to a preset second frequency offset value which is adjacent to the first frequency offset value; wherein, the preset frequency offset values are lined according to size, and the first frequency offset value and the second frequency offset value are all one frequency offset value in the plurality of the frequency offset values; and the adjusted first frequency offset value is determined to be the estimated final frequency offset value. The invention also discloses a device for realizing the method.
Description
technical field [0001] The invention relates to the communication field, in particular to a frequency offset estimation method and device. Background technique [0002] At present, users of the second generation mobile communication system can only work on one carrier. Different from the second generation mobile communication system, one of the most prominent features of the third generation communication network (3G) is to support high-speed data services. With the development of technology, Beyond3G and 4G can achieve a data transmission rate of 100Mbit / s, or even higher, supporting services ranging from voice to multimedia services, including real-time streaming media services. The data transmission rate should be dynamically adjusted according to the rate required by these services. At the same time, the next generation of mobile communications must also achieve high speed and large capacity on limited spectrum resources, requiring technologies with extremely high spec...
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IPC IPC(8): H04L25/03H04L25/02H04B7/26
Inventor 徐海燕杜静波李根
Owner NANJING ZHONGXING SOFTWARE