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Method for transmitting and receiving quasi-orthogonal time space group code, transmitter and receiver, and communication system

A space-time block coding and space-time block coding technology, applied in the field of communication systems, can solve the problems of poor system performance, no use of space-time diversity effect, multi-antenna inter-symbol interference, etc., and achieve the effect of reducing the bit error rate

Inactive Publication Date: 2006-12-06
UT STARCOM (CHINA) CO LTD +1
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] "International Institute of Electronics and Electrical Engineers Communication Letters" (IEEE Communications Letters, Volume.8, No.8, pp.514-516, Aug, 2004) proposed a random rotation of the constellation diagram to improve multiple-input multiple-output (MIMO) System performance method; although this method fully utilizes the space transmission multiplexing capability, it hardly utilizes the space-time diversity effect; and due to the inherent intersymbol interference between multiple antennas, the system performance is poor

Method used

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  • Method for transmitting and receiving quasi-orthogonal time space group code, transmitter and receiver, and communication system
  • Method for transmitting and receiving quasi-orthogonal time space group code, transmitter and receiver, and communication system
  • Method for transmitting and receiving quasi-orthogonal time space group code, transmitter and receiver, and communication system

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Embodiment 1

[0038] In the multi-antenna system used in this embodiment, the transmitting end is a transmitting antenna array including four transmitting antennas, and the receiving end is one receiving antenna. It is assumed that the wireless channel is a quasi-static Rayleigh fading channel, and the receiver can accurately estimate the channel fading information. The signal-to-noise ratio (SNR) is defined as the ratio of the average power of the useful signal to the noise in the signal vector of the receiving antenna. The system adopts 4×1 transmit diversity quaternary phase-shift keying (QPSK) modulation.

[0039] The baseband transmission block diagram of the transmission and reception method of the quasi-orthogonal space-time block code of the present invention is as attached figure 1 Shown: Gaussian random matrix generation module 1 generates a 4×4 complex Gaussian random matrix 2, the elements of the matrix are independent and identically distributed complex field random variables,...

Embodiment 2

[0062] The technical solution of embodiment 2 is basically the same as the embodiment of embodiment 1, and its difference is that the coding mode that described quasi-orthogonal space-time block coding module 17 adopts is Jafarkhani coding: namely

[0063] S J ( s 1 , s 2 , s 3 , s 4 ) = A B - B * A * = s 1 ...

Embodiment 3

[0071] The technical solution of embodiment 3 is basically the same as the implementation of embodiment 1, and its difference is that the encoding method adopted by the quasi-orthogonal space-time block coding module 17 is a modified Jafarkhani coding method: namely

[0072] S JT ( s 1 , s 2 , s 3 , s 4 ) = s 1 s 2 s 3 s 4 ...

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Abstract

The invention is related to transmitting / receiving method in quasi-orthogonal time space group code, receiver and transmitter and corresponding comm. system. Random rotation matrix is obtained through Graham-Schmitt orthogonalized decomposing plural gauss random square matrix. After using multiplication between random rotation matrix and symbolic vector of planisphere, the transmitting terminal carries out encoding quasi-orthogonal time space group code so as to make new planisphere possess characteristic of random distribution. Thus, interferences among multiple antenna symbols at transmitting end are distributed evenly. Moreover, distribution of probability density in high power interference segment is smaller relatively so as to raise performance of system in high SNR. Accordingly, all possible symbolic vectors of planisphere at receiving end are carried out rotation same as transmitting end randomly and then maximum likelihood decoding is carried out.

Description

technical field [0001] The invention belongs to the technical field of multi-antenna mobile communication, and in particular relates to a quasi-orthogonal space-time block code transmitting method and receiving method, a receiver implementing the method, a transmitter and a communication system including the transmitter and the receiver. Background technique [0002] Space-time code diversity method is generally considered to be an effective technology against wireless channel fading in mobile communication systems. [0003] "International Institute of Electronics and Electrical Engineers Communications Journal" (IEEE Transactions on Communications, Volume.49, No.1, pp.1-4, Jan.2001) published a quasi-orthogonal space-time block code (QO-STBC) diversity The transmission method can achieve full-rate transmission; however, due to the non-complete orthogonality of the space-time block code matrix and the fixed constellation distribution, this method causes large inter-symbol in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/00
Inventor 邓单朱近康
Owner UT STARCOM (CHINA) CO LTD
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