Multi-service multiplexing dual-antenna diversity method and system
A dual-antenna, multi-service technology, applied in the field of digital information transmission, can solve problems such as the inability to achieve the system transmission rate, and achieve the effect of improving the ability to resist multipath fading and increasing the transmission rate
Active Publication Date: 2013-01-30
TSINGHUA UNIV
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Problems solved by technology
Although there are many ways to achieve this goal, none of them can achieve a certain space diversity gain while increasing the system transmission rate, thereby improving the system's ability to resist multipath fading
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[0034] The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.
[0035] figure 1 It is a flow chart of the method of the present invention; figure 2 For according to an embodiment of the present invention based on TDS-OFDM (Time Domain Synchronization-Orthogonal Frequency Division Multiplexing, Time Domain Synchronous Orthogonal Frequency Division Multiplexing) high-definition and mobile TV business multiplexed dual antenna diversity method flow chart . In this embodiment, space-time coding is performed between two adjacent subcarriers in one OFDM symbol. Assume that HDTV services transport twice as much traffic as mobile TV services.
[0036] Such as figure 2 As shown, the method of this embodiment specifically includes the foll...
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The invention discloses a multi-service multiplexing dual-antenna diversity method and a multi-service multiplexing dual-antenna diversity system. The method comprises the following steps: regulating the transmission rate of a smaller data stream to ensure that the transmission rate of the smaller data stream is matched with that of a larger data stream; controlling the power of the larger data stream to obtain average transmission power; controlling the power of the smaller data stream to obtain the average transmission power, wherein the summation of the average transmission power of the larger data stream and the average transmission power of the smaller data stream is constant; performing time space coding on the two data streams at the same time; respectively extracting data blocks to two transmitting antennas from the two data streams after performing the time space coding; and inserting related training sequences into the data blocks to form a signal frame for transmitting. The method and the system realize the multiplexing of the larger data stream and the smaller data stream by utilizing the time space coding, give consideration to the advantages of a plurality of antennas at the same time of realizing the improvement on the transmission rate of a system, and obtain a certain space diversity gain so as to improve the anti-multipath fading capability of the system.
Description
technical field [0001] The present invention relates to the technical field of digital information transmission, and more specifically relates to a dual-antenna diversity method and system for multi-service multiplexing. Background technique [0002] In the wireless environment, there are many kinds of fading in the transmission channel, such as time selective fading and frequency selective fading. When the signal is transmitted in a fading channel, the SNR (Signal to Noise Ratio) of the received signal is unstable. When the signal passes through a deep fading channel, the SNR of the received signal decreases, and the probability of a judgment error increases. Diversity technology is a technology that can effectively overcome time and frequency selective fading. It transmits the same information on multiple independent channels, and then the receiving end synthesizes the received signals according to a certain algorithm, because several independent channels At the same time...
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IPC IPC(8): H04B7/06H04L1/06
Inventor 王劲涛王昭诚昌文婷王军潘长勇宋健杨知行
Owner TSINGHUA UNIV