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Lead code detecting method of subscriber station receiver

A detection method and preamble technology, which are applied in the directions of multi-frequency code systems, multiplexing communication, orthogonal multiplexing systems, etc., can solve the problem of inability to detect downlink preambles and reduce the applicability of SS receivers, etc. problems, to achieve the effect of facilitating software implementation, improving accuracy, and reducing the amount of detection operations

Active Publication Date: 2008-06-11
WUHAN HONGXIN TELECOMM TECH CO LTD
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Problems solved by technology

But it can not detect the downlink preamble at the same time, making the applicability in SS receivers reduced

Method used

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  • Lead code detecting method of subscriber station receiver
  • Lead code detecting method of subscriber station receiver
  • Lead code detecting method of subscriber station receiver

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Embodiment Construction

[0025] Based on the characteristics of the 802.16e downlink signal, the present invention proposes an effective preamble detection and synchronization method, which can accurately detect the preamble by utilizing the good autocorrelation and cyclic prefix (CP) of the preamble, and at the same time realize the symbol Timing synchronization and frequency offset estimation, and has high computing efficiency, very suitable for implementation on digital signal processors (DSP) or embedded microprocessors.

[0026] The following steps are shown in the flowchart of FIG. 1 .

[0027] An OFDMA symbol consists of two parts, the cyclic prefix (hereinafter referred to as CP) and the useful data part. The length of the cyclic prefix (cp_len) is generally pre-defined by the system, and the CP is the data copy of the useful data whose final length is cp_len. Coarse synchronization timing is accomplished by the CP correlation of OFDMA symbols. The baseband data received by the antenna is even...

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Abstract

The invention provides a lead pilot-code detection method of a user station receiver, which comprise the following steps: (1) each orthogonal frequency division multiplexing received by an antenna is accessed OFDMA symbols, correlation energy corresponding to each sliding sample point, a symbol serial number corresponding to the maximum correlation energy and the sample point deviation, namely, frame header coarse synchronization position are recorded; (2) the frame header coarse synchronization position is taken as a symbol timing reference to estimate a decimal frequency offset; (3) the estimated decimal frequency offset is used to calibrate the frequency offset of each symbol; (4) a sector number of the lead pilot-code and a fine timing position are detected; (5) a cell identification number of the lead pilot-code is detected, a corresponding lead pilot-code is researched and acquired by using the sector number of the lead pilot-code detected by the step (4) and the cell identification number detected by the step (5). The method provides an important modulation parameter and symbol synchronization for SS receiver data modulation, which can greatly reduce the ID Cell detection calculation capacity and improve the accuracy of the lead pilot-code detection and the symbol synchronization as well as facilitate the achievement of software in practical application.

Description

technical field [0001] The invention relates to the technical field of wireless communication, in particular to a preamble detection method of a user station receiver. Background technique [0002] WiMAX is a new generation of wireless broadband access technology based on the 802.16 protocol. It has the advantages of high data transmission rate, low complexity, and wide coverage. Many communication equipment manufacturers and operators in the world are actively developing, manufacturing and App activity. Recently, WiMAX has been absorbed by ITU-T as one of the official 3G standards, and a dedicated frequency band has been allocated. [0003] A subscriber station SS (Subscriber Station) is a terminal device relative to a WiMAXBS (Base Station, base station). Before the SS and the BS communicate normally, the SS needs to detect a preamble. According to the definition of 802.16e, the preamble is modulated on the first symbol of the downlink subframe, and each preamble is a pr...

Claims

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Application Information

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IPC IPC(8): H04L27/26H04J11/00
Inventor 陈惠锋洪媛姜韬
Owner WUHAN HONGXIN TELECOMM TECH CO LTD
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