Differential space-time transmission diversity system in multi-carrier modulation system and implementing method

A technology of multi-carrier modulation and transmit diversity, applied in the directions of space transmit diversity, multi-frequency code system, diversity/multi-antenna system, etc., can solve the problem of not using channel frequency diversity, low gain of delay diversity scheme, etc., and achieve high-altitude time diversity. The effect of high gain, spectral efficiency, and low detection complexity

Inactive Publication Date: 2009-06-10
ACAD OF BROADCASTING SCI SARFT
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Problems solved by technology

[0038] To sum up, both of the above two schemes have their own shortcomings. Among them, the Alamouti scheme does not take advantage of the frequency diversity of the channel, while the delay diversity scheme has the disadvantage of low gain when the channel is bad.

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  • Differential space-time transmission diversity system in multi-carrier modulation system and implementing method
  • Differential space-time transmission diversity system in multi-carrier modulation system and implementing method
  • Differential space-time transmission diversity system in multi-carrier modulation system and implementing method

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Embodiment Construction

[0066] Below, refer to the attached Figure 5-9 The differential space-time transmit diversity system and implementation method in the multi-carrier modulation system of the present invention are described in detail.

[0067] In OFDM system, space-time block codes are easy to construct and easy to decode. Through the orthogonal design of space-time coding, the system provides the maximum transmission rate in full diversity, so there is no loss of transmission bandwidth; the receiving end obtains the best signal-to-noise ratio, and can be decoded with the simplest maximum likelihood decoding algorithm. The differential coding detection technology can complete the non-coherent detection and obtain the space and time diversity of the system under the condition that the receiving end does not know the channel information. Differential space-time block codes transmit modulation information in different time slots of the same frequency, and a reference matrix needs to be transmitte...

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Abstract

The invention provides a system for a differential space time transmit diversity in a multicarrier modulation system and an implement method thereof, wherein the implement method comprises the following steps: A, a modulation signal is subjected to differential coding by a differential space time coder and is output to two paths; and B, one path of signal in the step A passes through an OFDM modulator and a cyclic prefix insertion device and is transmitted by an antenna, the other path of coding signal passes through another OFDM modulator and is transmitted to a time delay delta unit, after the signal is subjected to cyclic time delay with delta delayed time, the signal is transmitted to the cyclic prefix insertion device, inserted with cyclic prefix and transmitted by an antenna. On the premise of ensuring the transmission speed, the system can obtain high space time diversity gain and effectively improve system performance.

Description

technical field [0001] The invention relates to the technical field of communication and broadcast transmission, in particular to a differential space-time transmit diversity system and an implementation method in a multi-carrier modulation system. Background technique [0002] In multi-carrier systems, Space Time Block Code (Space Time Block Code, STBC) and cyclic delay diversity are two effective diversity methods. Since the fading effect of the wireless channel is the biggest obstacle to achieve reliable wireless data transmission at high data rates, space-time coding combines the diversity gain of multiple antennas and the coding gain of channel coding, so that it can be effectively achieved without reducing the data transmission rate. Anti-fading effect to achieve reliable transmission. Space-time coding has been adopted by the 3rd Generation Partnership Project (3rd Generation Partnership Project, 3GPP). Most of the current studies on space-time coding assume that th...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/06H04B7/08H04L1/06H04L27/26
Inventor 李继龙施玉海杨明
Owner ACAD OF BROADCASTING SCI SARFT
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