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Method for realizing synchronization in multi-input multi-output OFDM system

An orthogonal frequency division, multiple output technology, applied in the direction of orthogonal multiplexing system, multi-frequency code system, transmission system, etc., can solve the problems of poor realizability, no cancellation, sensitivity to OFDM frequency offset, etc.

Inactive Publication Date: 2007-12-05
ZTE CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] However, while the combination of MIMO and OFDM has the above advantages, it does not eliminate their own disadvantages: OFDM is very sensitive to frequency offset
However, this is at the cost of a large amount of calculations for weight calculations, and the method is less achievable

Method used

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  • Method for realizing synchronization in multi-input multi-output OFDM system
  • Method for realizing synchronization in multi-input multi-output OFDM system
  • Method for realizing synchronization in multi-input multi-output OFDM system

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Embodiment Construction

[0045] The specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0046] Referring to FIG. 1, it is a schematic flow diagram of a method for realizing synchronization in the MIMO+OFDM wireless system described in the embodiment of the present invention, and the specific process is as follows:

[0047] Step 110: Construct a preamble / synchronization sequence on each transmitting antenna and form a frame for transmission.

[0048] When the sending end constructs a preamble / synchronization sequence on each transmit antenna, the preferred scheme includes a cyclic prefix and a PN sequence. The preamble sequence may include at least one preamble symbol, and its time domain characteristic is that the length is N I The PN sequence repeats I times, where I=N / N I , N is the number of subcarriers of OFDM. The OFDM data symbols to be sent are respectively framed on each sending antenna and then sent simultaneously ...

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Abstract

The method includes following steps: constructing leading / synchronizing sequence on each transmission antenna, as well as carrying out framing and sending operations; carrying out once time synchronization by combining with cycling prefix information on each receiving antenna; using the leading symbols to carry out frequency deviation estimation (FDE) in time domain in integral multiple and decimal multiple for each receiving antenna; merging in equal gain for value of FDE on each receiving antenna so as to obtain final average value of FDE, and carrying out compensation of FDE for data of each receiving antenna; using leading symbol to carry out second synchronization for time; selecting best point of second synchronization for time; using the obtained best point to carry out synchronous post-processing. Satisfying precision required by operation, the invention raises SNR for received signal, does not use too much system resources, and increase redundancy of system, etc.

Description

technical field [0001] The invention relates to a multiple input multiple output (MIMO) orthogonal frequency division multiplexing (OFDM) system, in particular to a method for realizing synchronization in the MIMO+OFDM system, belonging to the field of wireless or wired communication. Background technique [0002] Multi-antenna multiple-input multiple-output (MIMO) is an efficient wireless transmission technology developed in recent years, which refers to using multiple transmitting antennas and receiving antennas at the transmitting end and receiving end respectively. The traditional communication system is a single-input-single-out SISO system. MISO and SIMO based on transmit diversity and receive diversity are also special cases of MIMO. The basic idea of ​​MIMO is to use multiple antennas at both ends of transmitting, receiving or transmitting and receiving, and make full use of the independent fading characteristics between channels through space-time processing technol...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26H04L1/02H04J11/00
CPCH04L27/261H04L27/266H04L27/2665H04L27/2663H04B7/04H04L27/2678H04L27/2675H04L27/2659
Inventor 刘巧艳余秋星王衍文张学林
Owner ZTE CORP
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