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Method and apparatus for reverse access channel detection signal

A technology of reverse access channel and signal detection, which is applied in the direction of selection device, error detection/prevention using signal quality detector, radio/inductive link selection and arrangement, etc. problems such as the decline of the receiving end and the inability to ensure that the receiving end can receive OFDM symbols, etc., to achieve the effect of wide-area coverage and improved detection performance

Active Publication Date: 2009-02-11
HUAWEI TECH CO LTD
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Problems solved by technology

[0006] When the time delay Δt is greater than CP, even if the entire CP is placed behind each OFDM symbol, it cannot be guaranteed that the receiving end receives a complete OFDM symbol. If the existing reverse access channel detection signal algorithm is still used, the performance of the obtained detection signal will drop sharply, so that the base station cannot detect the access signal of the access terminal, and it is difficult to achieve wide coverage of the base station

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  • Method and apparatus for reverse access channel detection signal
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  • Method and apparatus for reverse access channel detection signal

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Embodiment Construction

[0026] The technical solutions provided by the embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0027] The reference timing and receiving timing of the embodiment of the present invention are defined as follows:

[0028] see image 3 , the upper part is marked as the base time sequence (Base time) of the base station BS, and the lower part is marked as the receiving time sequence (Receive time) of the BS, ΔT represents the delay of the receiving time sequence relative to the reference time sequence; Cyclic prefix (CP) and windowing (Windowing), Tg represents the length of cyclic prefix (CP) and windowing (Windowing) (that is, the length of G), Tb represents the effective length of each OFDM symbol, Ts represents the length of each OFDM symbol Period length (=Tb+Tg); FFT Window i indicates the length of the i-th FFT transformation of the BS, that is, the length of the i-th OFDM symbol undergoing FFT...

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Abstract

The embodiment of the invention discloses a method and a device for a reverse access channel to detect signals. The method and the device can improve the detecting performance of the reverse access channel under the condition that time delay is larger than cyclic prefix, and realize wide coverage of a base station. The method comprises the following steps: fetching the present OFDM symbol and an OFDM symbol next to the present OFDM symbol; determining the ergodic interval of the time delay Deltat; taking the part of cycle length Ts minus Deltat from the present OFDM symbol from behind; taking the part of time delay Deltat from the OFDM symbol following the present OFDM symbol from the front; splicing the two parts into a new OFDM symbol; and circulating the time delay Deltat in the determined ergodic interval and detecting each spliced OFDM symbol to obtain each detection value of the base station in the ergodic interval. The method and the device can be applied to the ultra mobile broadband (UMB) system.

Description

technical field [0001] The present invention relates to mobile communication technology, in particular to a method and device for detecting signals of a reverse access channel (RACH, Reversal Access Channel). Background technique [0002] In an ultra mobile broadband (UMB, Ultra Mobile Bandwidth) system, when an access terminal (AT, Access Terminal), such as a mobile phone mobile terminal, needs to perform operations such as registration, location update, and call, it will initiate a reverse access (at Reverse Access Channel RACH) process. Reverse access is a process of completing accurate timing offset, frequency offset and power adjustment, so that the signal sent by the AT falls within the time specified by the base station (BS, Base Station) to facilitate the synchronous data transmission of the entire cell, and in order to Proper power reaches the BS. Generally speaking, if the AT is far away from the BS, the transmission delay will be large, and the BS may not be abl...

Claims

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Application Information

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IPC IPC(8): H04Q7/34H04L1/20H04L27/26
Inventor 林海鸿
Owner HUAWEI TECH CO LTD
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