Multi-user downlink transmission system self adaptive transmission method by using channel statistical information

A technology of adaptive transmission and channel statistics, applied in diversity/multi-antenna systems, baseband system components, space transmit diversity and other directions, can solve the problems of uplink capacity burden, unrealistic and other problems, achieve low complexity, high speed, easy-to-achieve effects

Active Publication Date: 2012-09-12
SOUTHEAST UNIV
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Problems solved by technology

Due to the inevitable error and feedback delay in the transmission of feedback information, it is often unrealistic to assume that the ideal channel information is known at the sending end, especially when the number of users and the number of transmitting antennas are large and the channel state changes rapidly. when
In addition, the feedback of channel information causes a great burden on the uplink capacity, and this problem becomes more serious in broadband (such as OFDM) systems and systems with high mobility

Method used

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  • Multi-user downlink transmission system self adaptive transmission method by using channel statistical information
  • Multi-user downlink transmission system self adaptive transmission method by using channel statistical information
  • Multi-user downlink transmission system self adaptive transmission method by using channel statistical information

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specific Embodiment approach

[0053] user terminal:

[0054] 1) Use the received signal for channel estimation to obtain the noise variance on the receiving antenna Use the formula [2] to calculate the channel eigenmode coupling vector m (k) .

[0055] 2) put m (k) and Feedback to the base station, enter step 3).

[0056] Base station:

[0057] 3) Divide users into n T class, where the user in the kth class satisfies its channel characteristic mode coupling vector with the largest element being the kth element.

[0058] 4) Select the user with the largest maximum element of the channel eigenmode coupling vector from each type of user;

[0059] 5) n selected from step 4) T Select the maximum elements of the channel eigenmode coupling vector from among the users and the maximum K users, which are respectively recorded as user 1 to user K;

[0060] 6) Utilize the noise variance of the scheduled users and its channel eigenmode coupling vector m (k) , according to the formula [4] to calculate its ...

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Abstract

A multi-user downlink transmission system self adaptive transmission method by using channel statistical information can greatly improve frequency spectrum utilization and power efficiency of a communication system. The transmission method comprises the following steps that: users use results of channel estimation to calculate the channel statistical information of their own, namely, a channel characteristic mode coupling vector and the noise variance of receiving antennas of different users; and a base station selects served users and carries out power distribution and precoding transmission, based on the feedback channel statistical information from the users. The invention provides a multi-user downlink MISO transmission system self adaptive transmission scheme by using channel statistical information. The method can adjust transmission parameters according to statistical characteristics of the channel, and can acquire a relatively high sum data rate.

Description

technical field [0001] The present invention relates to a multi-user downlink transmission system for transmitting high-speed data by using multiple sending antennas, in particular to an adaptive transmission method for a multi-user downlink transmission system using statistical channel information. Background technique [0002] In recent years, information theory research has shown that multi-antenna technology can significantly improve the transmission rate of wireless communication systems. At present, the research on the point-to-point single-user system has basically reached a conclusion, while the research on the capacity and optimal transmission scheme of the multi-user system has attracted extensive attention of international scholars. The multi-user multi-antenna system can obtain good performance and large capacity because of its diversity gain, multiplexing gain and multi-user diversity gain, and it will become one of the key technologies of the new generation wir...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/06H04B7/08H04B7/04H04L25/02
CPCY02D30/70
Inventor 李潇金石高西奇
Owner SOUTHEAST UNIV
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