Apparatus and method for transmitting signal in mobile communication system
A mobile communication system and signal transmission technology, which is applied in the transmission system, multi-carrier system, multiplex communication, etc., can solve the problems of reducing system functions, reducing signal detection functions, and having the same number of Tx antennas, etc.
Inactive Publication Date: 2005-07-20
LG ELECTRONICS INC
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[0051] However, there is actually some degree of correlation between the individual Tx antennas of the Tx antenna array, and a correlation between the Rx antennas of the Rx antenna array, and therefore, the consistency of signals transmitted from the individual Tx antennas cannot be guaranteed. independence
Similarly, mobile communication channels should ensure independent channels between each Tx antenna and each Rx antenna, however, it cannot actually guarantee that the number of independent channels is as many as the number of individual Tx antennas
[0052] Therefore, it is difficult for a receiving end of a general MIMO mobile communication system to independently detect a signal transmitted from a specific Tx antenna, and thus, an error may be generated and the function of signal detection may be reduced, and thus the entire system function may be reduced
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[0098] Reference will now be made in detail to the preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings.
[0099] In an antenna array with multiple antennas, there is some degree of correlation between adjacent antennas. For example, in the case where the number of antennas is four or more, independence between antennas at both ends in the array can be ensured, however, there is a large degree of correlation between adjacent antennas in the antenna array.
[0100] Therefore, in the present invention, Tx symbols are arranged on each antenna in consideration of correlation between antennas. Also, according to the present invention, Tx symbols are arranged on each antenna in consideration of symbol detection efficiency.
[0101] However, if the detection efficiency of symbols is the same in the case of a system under quadrature phase shift keying (QPSK), therefore, there is no advantage in considering the detection effici...
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A method for transmitting signal in a mobile communication system allocates symbols which will be transmitted to transmitting antennas appropriately as considering detection efficiencies of symbols on a higher order modulation constellation and correlation between antennas, and thereby independent symbol transmission can be made and independence between antennas can be improved to improve accuracy of symbol detection on a receiving end and signal transmitting function of the system can be improved. Therefore, a pair of symbols having the longest distance between symbols is arranged to a pair of antennas having higher correlation and a pair of symbols having the shortest distance between symbols is arranged to a pair of antennas having lower correlation. Also, symbols having higher detection efficiency are allocated to antennas having higher correlation and symbols having lower detection efficiency are allocated to antennas having lower correlation.
Description
technical field [0001] The present invention relates to a mobile communication system, more specifically to a signal transmission method and device for a mobile communication system using multiple antennas. Background technique [0002] Recently, with the rapid growth of the wireless communication market, various multimedia services are in great demand in the wireless environment, especially as transmission data increases and data transmission speed becomes fast. Therefore, finding a way to efficiently use the limited frequencies is a most urgent task. In an effort to overcome the problem, new transmission techniques using multiple antennas are needed, one example of which is a multiple-input multiple-output (MIMO) system using multiple antennas. [0003] FIG. 1 shows an example of a general mobile communication system employing a MIMO system. [0004] As shown in Figure 1, the existing MIMO system includes: a plurality of transmitting antennas 12; a vector encoder 10, whi...
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IPC IPC(8): H04B7/02H04B7/06H04J99/00H04L27/34
CPCH04B7/0615H04L27/34H04B7/02
Inventor 沈东熙金奉会
Owner LG ELECTRONICS INC