Receiving and detecting method of vertical layered space-time system based on self adaptive modulation

An adaptive modulation, vertical layering technology, applied in the direction of preventing/detecting errors through diversity reception, transmission systems, digital transmission systems, etc., can solve problems such as low spectral efficiency, attention to bit error performance, and no consideration of spectral efficiency.

Inactive Publication Date: 2008-02-20
XI AN JIAOTONG UNIV +1
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Problems solved by technology

Although adaptive modulation is used in this paper, it also pays attention to bit error performance and does not consider spectral efficiency
These two detection sequences have their own disadvantages. When the average SNR is low, the positive sequence detection cannot quickly and effectively change the invalid channel into a valid channel, and the corresponding spectral efficiency is low; when the average SNR is high, the reverse sequence Although detection increases the SNR of a saturated channel, it does not improve spectral efficiency because the channel is already saturated

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  • Receiving and detecting method of vertical layered space-time system based on self adaptive modulation
  • Receiving and detecting method of vertical layered space-time system based on self adaptive modulation
  • Receiving and detecting method of vertical layered space-time system based on self adaptive modulation

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Embodiment Construction

[0026] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0027] Suppose a MIMO transmission system with M transmitting antennas and P receiving antennas, the channel is quasi-static flat Rayleigh fading, each sub-channel is independent of each other, the receiving end has ideal channel estimation and synchronous reception, and the received signal r=Hb+n, where r is a P×1-dimensional received signal vector; H is a P×M-dimensional channel matrix; n is a P×1-dimensional Gaussian white noise with a mean value of 0 and a variance of σ 2 b is the modulated transmit signal vector of M × 1 dimension, the present invention does not consider encoding, each element in b corresponds to the signal of each transmit antenna, and its modulation system is adaptively modulated by the receiving end according to the fading of each subchannel, and The modulation system informs the transmitting end through the low-rate feedback link, an...

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Abstract

This invention puts forward a receiving and test method for a vertical lamination space time system based on adaptive modulation, which first of all tests channels with the modulation system reaching the maximum saturation, then tests the invalid channels with SN ration can't meet the lowest threshold, finally tests the residual sub-channels according to the principle of the priors with the SN ratio approaching to the threshold value after detection, which can make the tested SN ratio to satisfy the SN-ratio threshed value properly, so, channel resources can be used to the utmost.

Description

technical field [0001] The invention relates to a reception detection method of a wireless communication system, in particular to a reception detection method of a vertical layered space-time system based on adaptive modulation. Background technique [0002] The next-generation mobile communication system needs to support high-speed multimedia transmission services with different service quality requirements. The main index of high-speed transmission is spectrum efficiency, that is, under the premise of a given bit error rate and call drop rate, the maximum transmission rate that can be achieved within the unit bandwidth of a unit cell. [0003] Bell Labs Vertical Layered Space-Time System (V-BLAST) is a technology first proposed by Bell Labs that uses multiple antennas at both the transmitting end and the receiving end. It is a technology that makes full use of airspace resources to improve communication systems Spectrum efficient communication technology. Under the usual...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L1/00H04L1/06
Inventor 冯兴乐朱世华任品毅
Owner XI AN JIAOTONG UNIV
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