Low complexity decoding method of quasi-orthogonal space-time block codes

Abstract

The invention discloses a low complexity decoding method of quasi-orthogonal space-time block codes based on the Pairwise-MMSE. The method includes the steps that in a multi-input and multiple-output system, a transmitting end conducts quasi-orthogonal space-time block encoding on input signals, and a receiving end decodes the quasi-orthogonal space-time block codes by combining a linear decoding algorithm with a pairing decoding algorithm under the condition that channel state information is known by the receiving end so that the input signals can be recovered. The low complexity decoding method of the quasi-orthogonal space-time block codes is better in performance and in the aspect of system resource saving, although certain system performance is lost, the complexity for decoding can be effectively lowered.

Description

technical field [0001] The present invention belongs to the field of mobile communication, and mainly relates to space time coding technology (Space time technique), especially the low complexity of Quasi-orthogonal space time block code (Quasi-orthogonal space time block code, Q-OSTBC) based on Pairwise-MMSE decoding. technical background [0002] With the popularization of wireless communication, space-time coding technology has been extensively studied. Generally, the space-time coding technology adopts an orthogonal design, which can obtain diversity gain, improve system performance, and obtain lower bit error performance. [0003] H. Jafarkhani uses a pairwise decoding algorithm to decode the received signal (H. Jafarkhani. A quasi-orthogonal space-time block code. IEEE Trans. Commun, VOL. 49, Jan. 2001, pp. 1-4), However, the pairwise decoding algorithm decodes two symbols at the same time. Although the performance is excellent, its complexity is relatively high. F...

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Problems solved by technology

[0005] The present invention aims at the problem of how to obtain high performance on the basis of ensuring low complexity in a multiple-input multiple-output (MIMO) system, and proposes a low-complexity decoding of quasi-orthogonal space-time block codes based on Pairwise-MMSE The method includes the following steps: in a multiple-input multiple-output system, the transmitting end performs quasi-orthogonal space-time block coding on the input signal, and the receiving end uses linear decoding algorithm and pairwise decoding algorithm under the condition of known channel state information Combined with the code algorithm, it decodes the quasi-orthogonal space-time block code and restores the input signal

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