Apparatus and method for cancelling interference in an OFDM system using multiple antennas

A technology for transmitting antennas and receiving antennas, applied in the field of OFDM mobile communication systems, can solve the problems of reducing the error correction performance of receivers and increasing the interleaving time of transmitting antennas, etc.

Inactive Publication Date: 2005-06-22
SAMSUNG ELECTRONICS CO LTD
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Problems solved by technology

This means that the error correction performance of the receiver is reduced due to the characteristics of the SIC receiver
However, as a way to overcome the above problems, it has been proposed to use different interleaving types for different transmit antennas. The disadvantage of this scheme is that the interleaving time of each transmit antenna is increased, and the interleave type of each transmit antenna must be the same as that of the receiver. Known

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  • Apparatus and method for cancelling interference in an OFDM system using multiple antennas
  • Apparatus and method for cancelling interference in an OFDM system using multiple antennas
  • Apparatus and method for cancelling interference in an OFDM system using multiple antennas

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Embodiment Construction

[0063] Preferred embodiments of the present invention will be described below with reference to the accompanying drawings. In the following description, well-known functions or constructions will not be described in detail since they would obscure the content of the present invention in unnecessary detail.

[0064] Figure 5 is a block diagram of a transmitter in a multi-antenna OFDM mobile communication system according to the present invention. refer to Figure 5 , the encoder 500 encodes the input binary bits and outputs an encoded bit stream. The S / P converter 502 splits the continuous coded bit stream into as many parallel coded bit streams as there are transmit antennas 520-522. Interleavers 504-506 interleave the parallel coded bit stream, and modulators 508-510 map the interleaved coded bits into modulation symbols of QPSK, 8PSK, 16QAM, or 64QAM. The number of bits per symbol is determined by the modulation mode used. A QPSK modulation symbol has 2 bits, an 8PSK m...

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Abstract

An apparatus and method for canceling interference in an OFDM system using multiple antennas, wherein an error of a symbol received from another receiving antenna is estimated based on an error estimation of a symbol received from another receiving antenna. Before transmission, symbols to be transmitted through a plurality of transmit antennas are shifted by a predetermined number of bits without overlapping. Thus, the influence of an error in a symbol received from a receive antenna on an erroneous estimate of a symbol received from another receive antenna is reduced.

Description

technical field [0001] The present invention relates to a MIMO (Multiple Input Multiple Output) multi-antenna OFDM (Orthogonal Frequency Division Multiplexing) mobile communication system, in particular to a device and method for improving the performance of error correction codes, the error correction Codes are used to correct errors caused by error propagation. Background technique [0002] Signals transmitted as radio signals experience multipath interference due to various obstacles between the transmitter and receiver. The characteristics of a multiplex radio channel depend on the maximum delay spread and the signal transmission period. If the transmission period is greater than the maximum delay spread, no interference occurs between successive signals, and the radio channel is frequency domain characterized as a frequency non-selective fading channel. However, in broadband high-speed transmission, the transmission period is smaller than the maximum delay spread. As...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04J99/00H04B7/04H04J11/00H04L1/00H04L1/06H04L27/26
CPCH04L1/0071H04L1/06H04L27/26
Inventor 黄讚洙宋基逢李东俊
Owner SAMSUNG ELECTRONICS CO LTD
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