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Method for rotating modulation signals for MIMO-OFDM system

A technology of rotational modulation and modulation symbols, applied in the field of rotational modulation signals, which can solve problems such as limited performance gain and no use of modulation diversity

Inactive Publication Date: 2010-01-20
BEIJING UNIV OF POSTS & TELECOMM
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Problems solved by technology

In the case of BICM, although bit-interleaved modulation increases the time diversity of coded modulation, however, because it does not use modulation diversity, its performance gain is limited

Method used

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  • Method for rotating modulation signals for MIMO-OFDM system
  • Method for rotating modulation signals for MIMO-OFDM system
  • Method for rotating modulation signals for MIMO-OFDM system

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Embodiment Construction

[0030] In order to make the purpose, technical solution and advantages of the present invention clearer, the specific steps, features and performance of the method of the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0031] The invention is a method for rotating and modulating signals in MIMO-OFDM system. The method can efficiently utilize various excellent characteristics of time diversity, space diversity and frequency diversity, reduce transmission error rate and improve transmission reliability.

[0032] see figure 1 , introduce each specific operation step of the inventive method:

[0033] Step 1. The sending end determines according to the coding rate R, the modulation order M, the number of users P on each antenna, the number of OFDM symbols OFDM_Num sent during each transmission, and the number of modulation symbols OFDM_Length set in each OFDM symbol. The information bit length K of each u...

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Abstract

The invention relates to a method for rotating modulation signals based on an MIMO-OFDM system, the method mutually combines three technologies of MIMO, OFDM and rotation modulation and comprises the steps of firstly introducing a signal modulation subset into rotation and component interweaving which are used for modulating a constellation diagram, dispersing sending data onto different components by rotation modulation and component interweaving, leading an I path component and a Q path component generated by modulation symbols after sending during the transmission process to carry out independent transmission on the respective fading channel, eliminating the correlation between I path and Q path fading factors of sending signals, increasing the advantages of a signal space subset, obtaining gains of the modulation subset, selecting an optimal rotation angle, obtaining the greatest upgrade of transmission performance and simultaneously introducing a space subset of multiple antennas, a frequency subset of an OFDM system and a time-frequency interweaving subset, thereby leading the system to achieve very high transmission efficiency, improving the utilization rate of frequency spectrum, realizing the transmission with high reliability through the subsets, reducing the bit error rate and the frame error rate, being close to the channel capacities of the fading channels and meeting the requirements of development of the next generation of a wireless transmission network.

Description

technical field [0001] The present invention relates to a signal modulation method in a digital communication system, to be precise, to a method for rotating and modulating a signal in an MIMO-OFDM system, and belongs to the technical field of wireless communication. Background technique [0002] With the development of cellular mobile communication, Internet and multimedia services, the demand for capacity of wireless communication is increasing rapidly around the world. On the other hand, the available wireless spectrum is limited. If the utilization rate of the communication spectrum is not significantly improved, it cannot meet the development needs of the ever-increasing communication capacity. In a single-antenna link system, using advanced channel coding (such as Turbo code and low density check code), the channel capacity can be close to Shannon; by increasing the number of antennas at the transmitting end and receiving end, the spectrum utilization can be further s...

Claims

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Application Information

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IPC IPC(8): H04L1/06H04L1/00H04L27/26
Inventor 吴湛击傅婷婷张力岭王旭王文博
Owner BEIJING UNIV OF POSTS & TELECOMM
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