Data transmitting method, data transmitting system, data receiving method and data receiving system in wireless communication

Abstract

The invention discloses a data transmitting method, a data transmitting system, a data receiving method and a data receiving system in wireless communication. The data transmitting method in the wireless communication comprises the steps: interpolating a plurality of OFDM (orthogonal frequency division multiplexing) signals on a plurality of transmitting antenna branches to form a plurality of sampling point data frames; respectively adding a plurality of cyclic prefixes and cyclic postfixes to the sampling point data frames on each branch, wherein the total lengths of the cyclic prefix and the cyclic postfix added onto each branch are as the same as one another, the total lengths are not less than the maximum multi-path channel time delay, and the lengths of the cyclic prefixes respectively added to each antenna are different from one another; and the data frame to which the cyclic prefix and the cyclic postfix are added on each branch is processed by means of pulse forming to obtaina plurality of continues signals; and transmitting the continues signal on each branch by the antennas of the branch. According to the invention, the time delay diversity of the signal transmission can be generated, the receiving diversity can be increased, and the number limitation of the receiving antennas and the transmitting antennas can be avoided.

Description

technical field [0001] The invention relates to the field of communication technology, in particular to a method and system for transmitting and receiving data in wireless communication. Background technique [0002] MIMO (Multiple-Input Multiple-Output) system can use abundant scattering channels to obtain huge theoretical capacity. Information theory research shows that the capacity of MIMO system increases linearly with the number of transmitting antennas. OFDM (Orthogonal Frequency Division Multiplexing) has strong anti-fading ability and high spectrum utilization rate, and is suitable for high-speed data transmission in multipath environment and fading environment. Making full use of the advantages of these two technologies, the MIMO-OFDM technology that combines the two organically combines space diversity, time diversity and frequency diversity, thereby greatly improving the channel capacity and transmission rate of the wireless communication system, effectively resis...

AI Technical Summary

Problems solved by technology

However, the linear detection algorithm has the following disadvantages: it needs to ensure that the number of receiving antennas cannot be less than the number of transmitting antennas, that is, Otherwise it does not provide enough degrees of freedom to distinguish M T The data of transmitting antennas; in addition, the detection performance of the linear detection algorithm is poor, and only M R -M T +1 diversity degree

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