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Method for OFDM communication system to transmit and receive frame prefix

A communication system and frame receiving technology, which is applied in the transmission system, multi-frequency code system, digital transmission system, etc., and can solve problems such as FCH analysis errors

Active Publication Date: 2010-03-31
ZTE CORP
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a method for sending and receiving FCH in an OFDM communication system, so as to solve the problem that the existing FCH parsing error and downlink data reception are still processed according to the error information

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  • Method for OFDM communication system to transmit and receive frame prefix
  • Method for OFDM communication system to transmit and receive frame prefix
  • Method for OFDM communication system to transmit and receive frame prefix

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Embodiment Construction

[0025] The present invention will be further described in detail below in conjunction with the accompanying drawings and preferred embodiments.

[0026] Such as figure 1 As shown, combined with the WiMAX system, the FCH occupies 4 sub-channels in one bandwidth, and the positions of the 4 sub-channels are different in different sectors. The meaning of the original 24 bits in the FCH packet is as follows figure 2 As shown, each field of FCH mainly indicates information related to DL_MAP, field 1 indicates the use of subchannels, fields 2 and 6 are reserved, field 3 indicates the repetition factor, field 4 indicates the coding method, and field 5 indicates DL_MAP length indication.

[0027] The following embodiments are described by taking the Fourier transform of 10M bandwidth and 1024 points in the WiMAX system as an example.

[0028] Such as image 3 As shown, it is a flow chart of the sending method of the present invention, which specifically includes the following step...

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Abstract

The invention relates to a method for OFDM system to transmit and receive frame prefix. The transmitting method includes that: a base station firstly assembles frame prefix information into package, so as to obtain original 24 bits; then additional 24 bits are calculated and forms 48 bits required by frame prefix coding with the original 24 bits; coding, modulating and four times repetition are carried out on the bit stream of the 48 bits, and the 48 bits are mapped into four sub channels to be transmitted; the receiving method includes that: a receiving terminal firstly extracts corresponding data in four channels, and demodulating, decoding and de-interlacing are carried out on the data to obtain bit stream of the 48 bits; then verification 24 bits are calculated; the verification 24 bits are compared with the rear 24 bits of the 48 bits, if coincident, decoding is correct, frame configuration information is reported to high layer; or else, decoding is error, and an error message isreturned to the base station. The invention can save system soft hardware resource while the receiving terminal analyzes error.

Description

technical field [0001] The present invention relates to the field of wireless communication, in particular to a method for sending and receiving a frame prefix (Frame Prefix, also called Frame Control Header, FCH) in an OFDM (Orthogonal Frequency Division Multiplex, Orthogonal Frequency Division Multiplexing) communication system. Background technique [0002] As a multi-carrier transmission mode, OFDM converts a set of high-speed serial transmission data streams into a set of low-speed parallel transmission data streams, which greatly reduces the sensitivity of the system to the frequency selectivity of multipath fading channels and improves bandwidth utilization. The characteristics of high performance and simple implementation make OFDM more and more widely used in the field of wireless communication. For example, the digital broadcasting (DAB) and digital television (DVB) formulated by the European Telecommunications Standardization Organization ETSI both adopt OFDM tech...

Claims

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Application Information

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IPC IPC(8): H04L27/26H04L1/00
Inventor 刘巧艳张娟赵路
Owner ZTE CORP
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