Method and device for processing data to be transmitted by adopting space-time coding by combining with precoding

Abstract

The invention discloses method and device for processing data to be transmitted by adopting space-time coding by combining with precoding, which are applied to a base station with multiple transmitting antennas. The method comprises the following steps of: carrying out quasi-orthogonal space-time block code space-time coding with rotation factors on the data to be transmitted by the base station to generate multi-path coded data corresponding to the antennas in number; meanwhile, selecting a corresponding precoding mode by the base station according to speed fed back by a terminal and selecting a corresponding precoding codebook from a precoding codebook list stored in the base station by combining with the number of the antennas; precoding the multi-path coded data by the base station according to the selected precoding codebook and then outputting the coded data. The invention overcomes the constellation extension brought during carrying out the quasi-orthogonal space-time block code space-time coding so as to ensure that the data transmitted by the base station from the transmitting antennas can be self-adaptive to the conditions of channels.

Description

technical field [0001] The present invention relates to the field of mobile communication, in particular to a method and device for processing data to be transmitted by using space-time coding combined with precoding. Background technique [0002] The wireless communication system of the next generation (LTE-Advanced, long-term evolution advanced system) will provide better voice quality and faster data transmission rate. However, the time-varying multi-path transmission environment, limited bandwidth resources and users' demands on services make it very difficult to realize the above requirements. An effective way to solve these problems is to use space-time processing techniques. [0003] Literature [Jafarkhaui H, Seshadri N. Super-orthogonal space-time trellis codesIEEE, Trans on Information Theory, 2003, 2 (4).] (Jafarkhaui H, a super-orthogonal space-time trellis codes (SOSTTC, Super -Orthogonal space-time trellis code)), this super-orthogonal space-time trellis code ...

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Problems solved by technology

[0005] On this basis, the literature [Jafarkhani H, Hassanpour N. Super-quasi-orthogonal space-time trellis codes for four transmit antennas.IEEE Trans.on Wire.Comm, 2005, 4.] (Jafarkhani, suitable for four antennas The super-quasi-orthogonal space-time trellis code design) Among them, the super-quasi-orthogonal space-time trellis code (SQOSTTC, Super-quasi-orthogonal space-time trelliscode) is obtained by rotating part of the signal constellation and multiplying by different rotation matrices , using the quasi-orthogonal space-time block code as the inner code and the space-time trellis code as the outer code, so that it can provide full-rate, full-diversity and high-coding-gain coding in various states, and also provides coding gain and rate trade-off between; but this kind of quasi-orthogonal space-time block code that achieves full rate and full diversity by rotating the signal will bring constellation expansion

[0006] In addition, quasi-orthogonal space-time block codes do not consider the current channel conditions of the transmitting end when performing space-time coding

In the process of processing the data to be transmitted, in order to obtain good system performance, the existing technology generally processes the data to be transmitted through space-time coding combined with precoding (that is, preprocessing the channel), such as: [Optimal Linear Precoding Design Based the Quasi-Orthogonal STBC, Journal of Electronics & Information Technology, Feb.2008] (an optimal linear precoding matrix design method based on quasi-orthogonal space-time block codes), which uses channel information to improve the application of quasi-orthogonal space-time block codes The performance of the multiple-input multiple-output (MIMO, Multiple-Input Multiple-Output) system of the code, it uses the transmission mechanism that the precoding matrix and quasi-orthogonal space-time block code combine, and the data to be transmitted passes through the quasi-orthogonal space-time block code After space-time encoding, it is processed by a linear precoding matrix, and then sent from the transmitting antenna. The precoding matrix in this method uses the non-zero mean matrix and correlation matrix of the MIMO channel, and uses the pairwise error probability as its optimal value. Optimizing the design criteria; however, due to the expansion of the constellation when performing quasi-orthogonal space-time block code space-time coding, the data to be transmitted will be pre-coded after the quasi-orthogonal space-time block code space-time coding. The design criteria in this precoding will be very complicated, and it is generally difficult to implement in the actual system, so the base station cannot adapt to the channel conditions when sending the processed data from the transmitting antenna

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