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Transmitting antenna selection and adaption modulation method in multiple input and multiple output frequency-division multiplex system

A technology of transmitting antenna and modulation method, applied in the field of orthogonal frequency division multiplexing wireless communication system, can solve the problem of inapplicability of MIMO OFDM system, and achieve the effect of improving utilization efficiency and overcoming frequency selective fading

Inactive Publication Date: 2009-12-23
ZTE CORP
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  • Summary
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method is only for MIMO systems, and it is assumed that the MIMO channel has the characteristics of flat fading, so it is not suitable for MIMO OFDM systems with frequency selective fading channel characteristics.

Method used

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  • Transmitting antenna selection and adaption modulation method in multiple input and multiple output frequency-division multiplex system
  • Transmitting antenna selection and adaption modulation method in multiple input and multiple output frequency-division multiplex system
  • Transmitting antenna selection and adaption modulation method in multiple input and multiple output frequency-division multiplex system

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Embodiment approach

[0081] It should be noted that the above steps 101-106 are the first embodiment of the present invention. The present invention also provides another embodiment, that is: in step 101, only the bit error rate in the highest modulation level mode is estimated. , And then calculate the average bit error rate under the highest modulation level in step 102, and then the judgments of steps 103 and 104 perform the same action, and then before step 105, estimate each bit error rate in the lowest modulation level mode, and then perform and Step 105 and 106 perform the same judgment action. Then, after the judgment in step 105 is no, calculate the bit error rate of all transmit antenna combinations at the remaining modulation levels except for the highest and lowest modulation level modes, and then compare this result with the previous one. By combining the calculated bit error rates at the highest and lowest modulation levels, all the results estimated in step 101 in the first implementati...

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Abstract

The invention discloses a transmission antenna selection and adaptive modulation method in a multiple-input multiple-output orthogonal frequency division multiplexing system. First, the bit error rate of each subcarrier under all modulation modes and all The average bit error rate of each antenna combination on all subcarriers under the level is lower than the target bit error rate, then all subcarriers use the highest level modulation mode, and select a group of transmitting antennas with the least number of antennas, if the lowest modulation level If the minimum bit error rate of each of the bit error rates is greater than the target bit error rate, then no choice is made; otherwise, the bit error rate that is smaller than the peak bit error rate and has the highest modulation level is selected as a candidate among the initially estimated bit error rates. Calculate the average bit error rate by selecting the bit error rate, and determine the selection of antenna and modulation method according to the comparison between the average bit error rate and the target bit error rate. The invention realizes the selection and adaptive modulation of the transmitting antenna.

Description

Technical field [0001] The present invention relates to a multiple-input multiple-output (MIMO) orthogonal frequency division multiplexing (OFDM) wireless communication system, in particular to a transmission antenna selection and adaptive modulation method in a space diversity MIMO OFDM system. Background technique [0002] With the development of wireless communication technology, users have put forward higher requirements for large-capacity data transmission and fast data transmission. Therefore, it is necessary to effectively utilize wireless communication system resources to improve the performance and efficiency of the wireless communication system. However, in future mobile communication systems, multipath fading and bandwidth efficiency will be the main technical factors hindering the vigorous development of communication systems. How to overcome these two difficulties is the core of the next generation of wireless communication research. Multi-carrier processing technolo...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L1/06H04L1/00H04B7/06
Inventor 蒋小奎王衍文王强
Owner ZTE CORP