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Signal transmitting method and apparatus based on cyclic prefix

A cyclic prefix and signal transmission technology, which is applied in the information field to achieve the effects of improved system performance, easy implementation, and improved throughput

Inactive Publication Date: 2009-09-02
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, generating a random sequence composed of {0} and {1}, using {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 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 modul...

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Abstract

A signal transmission method and device based on a cyclic prefix, using frequency domain equalization technology, the channel is pre-equalized at the transmitting end, and at the transmitting end, the modulated symbol stream is firstly divided into data blocks of corresponding sizes based on the transform at the transmitting end; Then, several transformed data blocks are multiplexed into a large data block in the time domain, and two guard intervals known by the receiving end are added at both ends of the data block. The main function of the guard interval is to remove the influence of the timing error on the pre-equalization. At the receiving end, by searching the guard interval, the received symbols are divided into several data blocks according to the number of multiplexes at the transmitting end. Finally, these data blocks are respectively subjected to inverse transformation corresponding to the transmitting end to obtain transmission data. In the presence of timing errors, compared with the system without guard interval, the throughput of the system is significantly improved in most SNR ranges.

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. The Multicarrier 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.) will select broadband frequency T...

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Application Information

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Patent Type & Authority Patents(China)
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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