Time delay compensation process in mobile communication system

A mobile communication system, delay compensation technology, applied in diversity/multi-antenna system, space transmit diversity and other directions, can solve the problems of complex implementation, large delay of radio frequency link, inability to solve, etc. effect of adjustment

Inactive Publication Date: 2008-03-05
POTEVIO INFORMATION TECH
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Problems solved by technology

[0003] In mobile communication systems, especially in mobile communication systems using smart antennas, since the performance of devices in different radio frequency links is different, and the distance between devices in different radio frequency links is also different, therefore, different radio frequency There is a large delay between links, which cannot meet the requirements of radio frequency link delay consistency in communication standards
[0004] Currently, the following methods can be used to solve the problem of large radio frequency link delay:
[0008] However, the delay compensation through the above three methods can only achieve the adjustment accuracy of the chip level, that is, the millisecond level, and the implementation of method 3 also requires hardware reconstruction
[0009] It can be seen that the existing time delay compensation method has low compensation accuracy for time delay, and the implementation is complex and costly, which cannot solve the interference between cells caused by large time delay and the smart antenna endowment. adverse effects of shape gain

Method used

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Embodiment 1

[0054] In this embodiment, fs=1.28Msps, ts=1 / fs=781.25ns, when the sampling frequency is 2.56Msps, the signal is shaped and filtered, and the polyphase filter bank that performs the shaped filter is used to realize the radio frequency link delay compensation.

[0055] FIG. 3 is a flow chart of a delay compensation method in Embodiment 1 of the present invention. As shown in Figure 3, taking the required delay compensation as 160ns as an example, the delay compensation method of the present invention includes the following steps:

[0056] Step 301, calculate the quotient of the sampling period and the accuracy level of time delay compensation.

[0057] In this embodiment, the precision level of time delay compensation is 10 ns, the sampling period Ts=ts / 2=390.625 ns, and the result is 39.0625.

[0058] Step 302, round up the quotient of the sampling period and the accuracy level of time delay compensation, determine the number of polyphase filters in the polyphase filter bank...

Embodiment 2

[0071] In this embodiment, the chip rate fs=1.28Msps, ts=1 / fs=781.25ns, when the sampling frequency is 2.56Msps, the signal is shaped and filtered, and the polyphase filter bank that performs the shaped filter is used to realize the Delay compensation for radio frequency links.

[0072] FIG. 4 is a flow chart of a delay compensation method in Embodiment 2 of the present invention. As shown in Figure 4, taking the required delay compensation as 2.03ms as an example, the delay compensation method of the present invention includes the following steps:

[0073] Step 401, calculating the quotient of the sampling period and the accuracy level of time delay compensation.

[0074] In this embodiment, the precision level of time delay compensation is 10 ns, the sampling period Ts=ts / 2=390.625 ns, the quotient of the sampling period and the precision level of time delay compensation is calculated, and the result is 39.0625.

[0075] Step 402, rounding up the quotient of the sampling p...

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Abstract

This invention discloses a compensation method for time delay in a mobile communication system including: A, determining numbers of multiphase filters in a multiphase filter set according to the accuracy stage of sample period and time delay compensation and getting a set of multiphase filter coefficients by extracting a set of the filters from high stage filters, B, selecting one coefficient from the set of coefficients as the coefficient of a molded filter in radio link, which adjusts time delay of a RF link by the group time delay difference character of the multiphase filter to realize accurate compensation to time delay.

Description

technical field [0001] The invention relates to mobile communication technology, in particular to a time delay compensation method in a mobile communication system. Background technique [0002] A base station in a mobile communication system includes several radio frequency links for information exchange with users. [0003] In mobile communication systems, especially in mobile communication systems using smart antennas, since the performance of devices in different radio frequency links is different, and the distance between devices in different radio frequency links is also different, therefore, different radio frequency There is a large delay between links, which cannot meet the requirements of radio frequency link delay consistency in communication standards. [0004] Currently, the following methods can be used to solve the problem of large radio frequency link delay: [0005] Method 1, adding analog devices in the radio frequency link to compensate for time delay. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/04
Inventor 曹雪
Owner POTEVIO INFORMATION TECH
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