Information transmitting and receiving methods and devices

Abstract

The embodiment of the invention provides an information transmitting device, which comprises a coding module and at least two modulation transmission modules, wherein the coding module is used for performing space frequency block coding and frequency switching transmission diversity combined coding on symbolic streams, and transmitting code streams formed through coding to two base stations which are respectively provided with at least two antennae and are adjacent to each other, wherein the code streams obtained by the base stations are different and comprise all modulation symbols in the symbolic streams; and the modulation transmission module maps symbols in each path of code stream to an orthogonal frequency division multiplexing (OFDM) subcarrier on a corresponding antenna for OFDM modulation, and the symbols are transmitted by the corresponding antenna. The coded code streams are transmitted to the base stations of two adjacent cells for distributive transmission, so that the problem of interference of the adjacent cells can be effectively solved.

Description

technical field [0001] The invention relates to the field of mobile communication, in particular to a method and device for transmitting and receiving information. Background technique [0002] The Long Term Evolution (LTE) standard formulated by the Third Generation Partnership Project (3GPP) is the mainstream trend in the evolution of next-generation mobile communications. This standard uses multi-antenna technology, which can be configured on the base station side Two or four antennas. [0003] The transmit diversity technology adopted by the two-antenna base station in LTE is Space Frequency Block Coding (SFBC for short). like figure 1 As shown, after the information bit stream undergoes channel coding and constellation mapping, the formed symbol stream is coded according to the Alamouti coding method, and the output two code streams are respectively mapped to the Orthogonal Frequency Division Multiplexing (OFDM) on the subcarrier and transmitted by two antennas respe...

AI Technical Summary

Problems solved by technology

Transmit diversity is performed on two or four antennas related to channel fading. If the total transmit power remains unchanged, the bit error rate (Bit Error Rate, BER) of the two or four antenna transmit diversity scheme is the same as that of the single antenna scheme. The rate is equal, and the space diversity gain cannot be obtained;

[0007] If the transmitted signals of adjacent base stations are different, strong inter-cell interference will be formed at the edge of the cell, making the performance of edge users poor

[0008] In addition, the terminal must first know the antenna configuration of the base station before it can perform correct space-time decoding, so the base station with two antennas and the base station with four antennas cannot be compatible in the same network, which brings difficulties to the smooth upgrade of the network

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