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Method for rotation modulation signal of MIMO system

A technology of rotational modulation and modulation symbols, which is applied in transmission systems, digital transmission systems, electrical components, etc., and can solve problems such as limited transmission performance gain

Inactive Publication Date: 2010-01-13
BEIJING UNIV OF POSTS & TELECOMM
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Problems solved by technology

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

Method used

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  • Method for rotation modulation signal of MIMO system
  • Method for rotation modulation signal of MIMO system
  • Method for rotation modulation signal of MIMO system

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Embodiment Construction

[0049] In order to make the purpose, technical solution and advantages of the present invention clearer, the specific steps, features and performances of the method of the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0050] The present invention is a method for rotation modulation signal in MIMO system: adopt rotation modulation and Q-way quadrature component interleaving, so that the I-way in-phase component and the Q-way orthogonal component of the transmitted modulation symbols are transmitted independently of each other in the transmission process. The cross component produces different fading respectively, eliminates the correlation of the I-path and Q-path fading coefficients of the transmitted modulation symbols, and obtains the modulation diversity gain; then introduces the time diversity and space diversity of the MIMO system, thereby effectively improving the transmission process of the fad...

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Abstract

The invention relates to a method for a rotation modulation signal of an MIMO system, which comprises the following steps: eliminating the relativity of the fading coefficients of I-path and Q-path channels sending the modulation signals by adopting rotation modulation and Q-path orthogonal component interweaving, and increasing the modulation diversity number to acquire modulation diversity gain; then leading in the time diversity and space diversity of the MIMO system, thereby improving the availability of frequency spectra even though the system achieves high transmission efficiency in the transmission process of a fading channel, realizing high transmission reliability through a plurality of diversities, decreasing an error rate and an error frame rate, approaching to an ideal channel capacity under the fading channel, and satisfying the development requirement of a wireless transmission net. Moreover, the method has simple and practical operation steps, low computational complexity and marked efficiency, can be used for a multiple code modulation technical scheme, is especially suitable for communication systems with high encoding rate code words, multiple antennae, high spectrum effectiveness and the like, and is superior to a BICM-MIMO system on integrated transmission performance.

Description

technical field [0001] The invention relates to a signal modulation method in a digital communication system, to be precise, to a method for rotating and modulating a signal with high efficiency and high frequency spectrum utilization rate for a MIMO 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 rec...

Claims

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Application Information

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