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Signal transmitting method and apparatus based on cyclic prefix

A cyclic prefix and signal transmission technology, applied in the field of information, to achieve the effect of improving throughput, overcoming the effects of phase rotation, and being easy to implement

Inactive Publication Date: 2006-10-18
SHANGHAI RES CENT FOR WIRELESS COMM
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Problems solved by technology

[0005] The purpose of the present invention is to provide a new cyclic prefix-based signal transmission method and device for the existing cyclic prefix-based signal transmission system using pre-equalization technology, so as to overcome the impact of symbol timing errors on pre-equalization

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  • Signal transmitting method and apparatus based on cyclic prefix
  • Signal transmitting method and apparatus based on cyclic prefix
  • Signal transmitting method and apparatus based on cyclic prefix

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Embodiment Construction

[0026] The device of the present invention includes two parts: a wireless transmitter and a wireless receiver. Now combined figure 1 Describe the wireless transmitter: Among them,

[0027] 1-1 is the data source module to be sent, and generates a random sequence composed of {0} and {1}, with {a k , K=0, 1,..., K} represents the output sequence of the module.

[0028] 1-2 is the channel coding module. The channel coding technology used can be determined as a certain scheme, such as concatenated code composed of RS code and convolutional code, Turbo code or LDPC code, or adaptive for multiple technologies Coding scheme. After the channel coding module, the input data sequence {a k ,K=0,1,...,K} is transformed into an output data sequence {b k , K=0,1,...,N}. K / N is the coding rate that can be adopted by the adaptive coding and modulation scheme (AMC).

[0029] 1-3 are symbol modulation modules. Responsible for mapping the channel-coded data sequence to the constellation diagram of ...

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Abstract

A method for transmitting signal based on cyclic prefix includes dividing modulated symbol stream to be data blocks in different size correspondingly based on emission end transform, multiplexing said blocks to be one large data block and adding two protective intervals known by receiving end at its two ends at emission end; dividing received symbol to be a numbers of data blocks according to multiplexed number of emission end by searching protective interval at reception end; finally carry out inverse transform corresponding to emission end separately on those data blocks for obtaining transmission data.

Description

Technical field [0001] The present invention belongs to the field of information technology, and relates to a signal transmission method and device based on a cyclic prefix using frequency domain equalization technology. Background technique [0002] In a broadband mobile communication system, due to the reduction of the symbol period, the transmitted signal is severely affected by channel multipath. In order to overcome the influence of inter-symbol interference (ISI) caused by multipath, the traditional technology is to use time-domain channel equalization, such as wideband code division multiple access (WCDMA) systems. For broadband transmission systems, when the channel impulse response is long, the time domain equalizer will become very complicated. Multi-carrier code division multiple access (MC-CDMA) system (Shinsuke Hara, Ramjee Prasad. "Overview of Multicarrier CDMA," IEEE Communications Magazine, pp: 126-133, Dec, 1997. pp: 126-133.) The broadband frequency selection Th...

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Application Information

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IPC IPC(8): H04L25/03
Inventor 李明齐唐琳张小东卜智勇王海峰
Owner SHANGHAI RES CENT FOR WIRELESS COMM
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