Transmission method in orthogonal frequency division multiplexing system with MIMO and transceiver thereof

Abstract

The invention discloses a transmission method used for multi-input and multi-output orthogonal frequency division multiplexing systems and a corresponding transceiver. The emitting process comprises that: multiplexing two groups of signals are obtained from signal layered coding and space frequency block coding is carried out to change the multiplexing two groups of signals into parallel signals;two groups of sub-carrier selection matrices are respectively right multiply the parallel signals of corresponding groups; a Fourier transform is carried out towards signals that are right multiplied, and signals are then transformed into parallel signals to be emitted. The receiving process comprises that: signals are received and transformed into parallel signals; after the Fourier transform is carried out towards the parallel signals, two groups of sub-carrier selection matrices are respectively right multiply parallel signals of corresponding groups to transform the signals into two groups of serial signals and then space-frequency group decoding is carried out; signals that are decoded are combined. The proposal of the invention can effectively suppress group interface and multi-user interface by only adjusting the structure of the transceiver.

Description

technical field [0001] The invention relates to transceiver technology in the field of mobile communication, in particular to a MIMO (Multiple Input Multiple Output) OFDM (Orthogonal Frequency Division Multiplexing) system transmission method and transceiver technology. Background technique [0002] A MIMO (Multiple Input Multiple Output) system can provide both diversity gain and multiplexing gain. Most of the existing MIMO technologies are originally designed to obtain the maximum diversity gain or multiplexing gain. For example, space-time coding STC (space-time codes) - including space-time block code STBC (Space-Time Block Code) or SFBC (Space-Frequency Block Code) and space-time trellis code (Space-Time Trellis Code) - The design of - is to obtain the greatest diversity gain; and the design of layered space-time code BLAST and V-BLAST is to obtain the greatest multiplexing gain. [0003] The group layered space-time block coding architecture GLSTBC (Group layered spac...

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Problems solved by technology

However, the introduction of the orthogonal relationship also brings the following problems: first, the coding gain of SFBC is only related to the structure of the signal constellation diagram used, and there is no good coding gain optimization method; second, if a 2 b The constellation diagram of signal points, the SFBC frequency band utilization can only be achieved when there are two antennas at the transmitting end b bit / (s·Hz) , when the number of antennas increases, its frequency band utilization is at most only 3 / 4 of the maximum value

Third, this OFDM with cyclic prefix converts a frequency-selective fading channel into N parallel flat-fading sub-channels, but it is difficult to effectively suppress inter-group interference and multi-user interference

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