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Blind descrambling method and relevant device thereof and descrambling method

A descrambling and demodulator technology, applied in the field of blind descrambling and related devices and descrambling, can solve problems affecting the operation of time slots

Inactive Publication Date: 2013-07-17
ALI SHANGHAI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if the demodulation or synchronization of time slot 0 is not smooth, it will affect the operation of subsequent time slots

Method used

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  • Blind descrambling method and relevant device thereof and descrambling method
  • Blind descrambling method and relevant device thereof and descrambling method
  • Blind descrambling method and relevant device thereof and descrambling method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0016] Please refer to figure 1 , figure 1 It is a flow chart of a blind descrambling procedure 10 used in a receiving end of an Orthogonal Frequency Division Multiplex (OFDM) system according to an embodiment of the present invention. The blind descrambling process 10 includes:

[0017] Step 100: start.

[0018] Step 110: Receive a plurality of OFDM symbols of a time slot.

[0019] Step 120: Obtain pilots from at least two OFDM symbols of the plurality of OFDM symbols.

[0020] Step 125: Descramble the acquired pilot according to multiple preset scrambling code complex pseudo-random sequences corresponding to multiple scrambling code initial values ​​to generate a descrambling result.

[0021] Step 130: Perform a cross-correlation operation among the generated descrambling results to generate a plurality of correlation results.

[0022] Step 140: Obtain a corresponding initial scrambling code value from the multiple initial scrambling code values ​​according to the corre...

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Abstract

The invention relates to a blind descrambling method and a relevant device thereof and a descrambling method. The blind descrambling method is used for an orthogonal frequency division multiplexing system, and comprises the following steps of: receiving a plurality of signs of a time slot; acquiring pilot frequency from at least two signs of the plurality of signs; descrambling the acquired pilotfrequency according to complex pseudorandom sequences of a plurality of preset scrambling codes to generate descrambling results, wherein the complex pseudorandom sequences of the plurality of presetscrambling codes correspond to a plurality of scrambling code initial values; performing mutual correlation operation among the generated descrambling results to generate a plurality of relevant results; acquiring a corresponding scrambling code initial value from the plurality of scrambling code initial values according to a relevant result with the maximum relevance in the plurality of relevantresults; and descrambling the plurality of signs according to the acquired scrambling code initial value.

Description

technical field [0001] The present invention relates to a descrambling method and related devices, especially to a blind descrambling method and related devices used in an orthogonal frequency division multiplexing system, and a descrambling method using blind descrambling. Background technique [0002] China Mobile Multimedia Broadcasting (CMMB) system is a mobile TV and multimedia standard, which adopts Orthogonal Frequency Division Multiplex (OFDM) 1 frame (Frame), each frame is divided into 40 time slots (Time Slot), from time slot 0 to time slot 39, each time slot includes 1 beacon (Beacon) and 53 OFDM symbols, each OFDM symbol It consists of three parts: continuous pilot, scattered pilot and data. When the bandwidth is 8MHz, each OFDM symbol includes 82 continuous pilots; when the bandwidth is 2MHz, each OFDM symbol includes 28 continuous pilots. [0003] In the same time slot, the scattered pilots on each OFDM symbol convey the same information, the scattered pilots...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/26H04L25/03
Inventor 徐玉婷
Owner ALI SHANGHAI
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