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Downlink power distribution method of multi-user JT MIMO system

A downlink and allocation method technology, applied in radio/inductive link selection and arrangement, energy-saving ICT, transmission control/equalization, etc., can solve problems such as high coding complexity, lower communication quality, and large energy gain in precoding , to increase system capacity and improve energy efficiency

Inactive Publication Date: 2007-11-28
CHONGQING UNIV OF POSTS & TELECOMM
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Problems solved by technology

At present, JT technology is divided into two categories: linear and nonlinear. Nonlinear joint transmission technologies, such as Tomlinson-Harashima precoding (THP) and transmission nonlinear It is controlled at a low level, but its encoding complexity is relatively high, literature (Hai Ping, Xie Xianzhong, Optimum Transmission Scheme Joint (JT) in TD-SCDMA Downlink. Journal of China Posts and Telecommunications Universities (English Edition), 2004, Vol.11 (3 ): 45-48) discloses a linear joint transmission technology with low coding complexity and easy practical application
However, there is a large energy gain in precoding in the linear joint transmission technology, which increases the multiple access interference between users and directly affects the total capacity of the system.
At the same time, due to the influence of channel estimation error and channel fading, the communication quality of the whole system is greatly reduced.

Method used

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  • Downlink power distribution method of multi-user JT MIMO system
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  • Downlink power distribution method of multi-user JT MIMO system

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Embodiment Construction

[0009] In the multi-user downlink of the JT MIMO system, the data of each user is modulated by the modulation matrix M and then transmitted in parallel at the same frequency on multiple antennas. The transmission energy of each user affects all other users, which is an interference-limited system. Therefore, how to reasonably allocate the transmission energy of the users, reduce the transmission power and improve the energy efficiency under the premise of ensuring the transmission quality of the users is a problem that the JT MIMO system needs to solve.

[0010] Figure 1 shows the downlink channel system structure diagram. A power distribution module is inserted between the QPSK modulation module and the spread spectrum module. The power distribution module performs power vector distribution, and multiplies the obtained power distribution vector with the modulated user transmission data. , and then spread spectrum, pre-processing, and transmit through the antenna.

[0011] Fig...

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Abstract

The invention discloses a downward link power distributing method of multi-user JT MINO system in the wireless communicating technical domain, which is characterized by the following: finding a practicable sending power vector after satisfying every user stem lower than small rain threshold; minimizing the total transmitting power of all users; calculating power allocating vector of each user through minimum energy calculating formula; transmitting the power control for downward link user according to power allocating vector; controlling the transmitting quality of each user effectively; improving the energy efficiency; expanding the system capacitance.

Description

technical field [0001] The invention relates to the technical field of wireless communication, in particular to channel power distribution in a multi-user system. Background technique [0002] The joint transmission JT technology is a multi-user transmission technology suitable for the downlink of the CDMA system. It is a transmission precoding technology relative to joint detection JD, which transfers the complex operation that needs to be completed in the terminal to the base station in the JD system. At present, JT technology is divided into two categories: linear and nonlinear. Nonlinear joint transmission technologies, such as Tomlinson-Harashima precoding (THP) and transmission nonlinear It is controlled at a low level, but its encoding complexity is relatively high, literature (Hai Ping, Xie Xianzhong, Optimum Transmission Scheme Joint (JT) in TD-SCDMA Downlink. Journal of China Posts and Telecommunications Universities (English Edition), 2004, Vol.11 (3 ): 45-48) d...

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Application Information

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IPC IPC(8): H04B7/005H04Q7/38
CPCY02B60/50
Inventor 谢显中龚翼
Owner CHONGQING UNIV OF POSTS & TELECOMM
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