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Method for realizing low feedback velocity of self-adaptive MIMO-SCFDE system

A self-adaptive, rate-based technology, applied in multi-frequency code systems, baseband system components, shaping networks in transmitters/receivers, etc., can solve problems such as large amount of returned information and low feedback rate

Inactive Publication Date: 2010-06-02
SHANDONG UNIV
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Problems solved by technology

[0005] The present invention aims at the problem of large amount of backhaul information existing in the existing adaptive MIMO-OFDM technology, and provides a method capable of realizing the low feedback rate of the adaptive MIMO-SCFDE system

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  • Method for realizing low feedback velocity of self-adaptive MIMO-SCFDE system
  • Method for realizing low feedback velocity of self-adaptive MIMO-SCFDE system
  • Method for realizing low feedback velocity of self-adaptive MIMO-SCFDE system

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Embodiment Construction

[0032] The embodiment gives the baseband simulation results without considering the influence of the synchronization error, that is, the synchronization is an ideal synchronization. And the channel estimation is ideal, that is, the channel estimation error is not considered. figure 1 A block diagram of an adaptive MIMO-SCFDE system using the method proposed by the present invention is given, wherein the functions of each module are as follows:

[0033] Source module 1: Generate bit information to be transmitted.

[0034] Bit mapping module 2: when QAM or PSK is selected as the modulation mode, the bit information is mapped to corresponding points in the constellation diagram. In this embodiment, QPSK modulation is adopted.

[0035] FFT module (M s Point) 3: Transform the original equivalent time-domain data frame into the equivalent frequency domain.

[0036] Precoding module 4: Generate a precoding matrix according to the available frequency domain subchannels sent back fr...

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Abstract

The invention provides a method for realizing low feedback velocity of a self-adaptive MIMO-SCFDE system, comprising the following steps: (1) an available subchannel is selected by a receiving end, an optimum order of a channel matrix is determined, information symbols are transmitted only on the available frequency domain subchannel to generate subchannel identification information and channel order information which is transmitted to a transmitting end through a feedback channel; (2) the transmitting end forms S original equivalent time domain data frames, converts the S original equivalent time domain data frames into equivalent frequency domain symbols, maps the equivalent frequency domain symbols onto the available frequency domain channel after precoding equivalent frequency domain symbols to generate N-dimensional frequency domain vector, and transmits the N-dimensional frequency domain vector by transmitting antenna; (3) the receiving end selects the signals transmitted on the available frequency domain subchannel for balancing, and judges the transmitted information after the equivalent time domain is converted. By selecting frequency domain subchannel transmission information with balanced amplification and small noise, the invention ensures that the error ratio performance can not excessively deteriorate, and deals with MIMO channel order deficiency by adopting simple precoding matrix.

Description

technical field [0001] The invention relates to a multi-antenna broadband wireless communication transmission method, and belongs to the technical field of broadband wireless communication. Background technique [0002] With the rapid development of science and technology, the impact of communication technology on people's daily life and national economic development is becoming increasingly important. In particular, broadband wireless communication technologies, such as Orthogonal Frequency Division Multiplexing (hereinafter referred to as OFDM: Orthogonal Frequency Division Multiplexing) and multiple-input multiple-output (hereinafter referred to as MIMO: Multiple-input Multiple-output) have received widespread attention, and the combination of the two MIMO -OFDM will become the key technology of future broadband wireless communication. [0003] MIMO uses the uncorrelated characteristics of channels between different antennas to obtain high channel capacity, thereby impro...

Claims

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Application Information

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IPC IPC(8): H04L1/06H04L25/03H04L27/26
Inventor 杜岩董雪
Owner SHANDONG UNIV
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