Self-adaption bit and power distribution method with low complex degree

A self-adaptive, bit-error-rate technology, applied in the direction of preventing/detecting errors through diversity reception, digital transmission systems, electrical components, etc. requirements and other issues to achieve the effect of low computational complexity

Inactive Publication Date: 2008-11-12
BEIJING UNIV OF POSTS & TELECOMM
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Problems solved by technology

Channel state information is the basis of adaptive bit and power allocation, and its quality has a significant impact on the performance of adaptive bit and power allocation methods. However, in practical systems, due to random channel changes, channel estimation errors, and processing delays Affected by factors, it is almost impossible

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  • Self-adaption bit and power distribution method with low complex degree
  • Self-adaption bit and power distribution method with low complex degree
  • Self-adaption bit and power distribution method with low complex degree

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Embodiment Construction

[0021] The present invention will be described in detail below through the accompanying drawings and examples.

[0022] The adaptive bit and power allocation method provided by the invention is suitable for MIMO systems and also for MIMO-OFDM systems. The MIMO system is taken as an example for description below.

[0023] figure 1 It is a block diagram of a MIMO system adopting the adaptive bit and power allocation method provided by the invention. At the receiving end, the channel moments with errors are obtained through channel estimation or channel prediction. ,Will After performing singular value decomposition, the weighting matrix of the receiver and transmitter is obtained and and the singular value matrix (·) H Represents the matrix conjugate transpose. Feedback the receiver and transmitter weighting matrices to the sender and receiver respectively, and the singular value matrix Feedback to adaptive bit and power allocation block. The adaptive bit and pow...

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Abstract

The invention discloses a self-adaptive bit and power allocation method with low complexity which is suitable for an MIMO system, and the method minimizes the total transmission power of the system under the condition that a sender cannot obtain an accurate channel state message and the bit error ratio of the system and the message transmission rate are restricted. The method is characterized in that signals to interference and noise ratios of equivalent sub-channels of the MIMO system under the condition of inaccurate channel state message are analyzed, thus obtaining an explicit relation between the transmission power of the sub-channels and the bit number; a non-convex optimization problem is converted into a convex optimization problem by adopting part monotonicity of functions, and then the closed optimal result in non-negative real number region of the optimization problem is calculated by adopting the Lagrangian approach; finally a real bit number is adjusted to a bit allocation result which requires the need of the real system and a corresponding power allocation is given. The invention is suitable for not only the MIMO system, but also an MIMO-OFDM system. The self-adaptive bit and power allocation method provided by the invention has the advantages of providing approximately optimal power efficiency under the condition of inaccurate channel state message and low operation complexity.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, and relates to a low-complexity self-adaptive bit and power allocation technology of a MIMO system, which uses inaccurate channel state information to minimize the bit error rate and information transmission rate of the system The total transmit power of the system. Background technique [0002] In the MIMO system, the adaptive bit and power allocation technology can adaptively adjust the distribution of information bits and power on each transmitting antenna according to the channel state information, thereby improving the system spectrum efficiency and ensuring the quality of information transmission. Therefore, in the field of wireless communication research Widespread concern. Channel state information is the basis of adaptive bit and power allocation, and its quality has a significant impact on the performance of adaptive bit and power allocation methods. However, in practica...

Claims

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Application Information

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IPC IPC(8): H04L1/00H04L1/06H04L27/26
Inventor 刘元安张然然谢刚杨爱敏唐碧华高锦春黎淑兰胡鹤飞李莉袁东明刘凯明刘思杨孙剑锋刘罡林晓峰
Owner BEIJING UNIV OF POSTS & TELECOMM
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