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Adaptive power distribution method for multi-antenna OFDM communication system

A technology of orthogonal frequency division and multiplexing communication, which is applied in the direction of orthogonal multiplexing system, multiplexing communication, multi-frequency code system, etc., and can solve problems such as system implementation difficulties

Inactive Publication Date: 2005-04-06
SHANGHAI JIAO TONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This algorithm gives the optimal solution for the distribution of the number of transmission bits in the range of real numbers, but when the number of transmission bits is non-integer, the realization of the system will be very difficult

Method used

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  • Adaptive power distribution method for multi-antenna OFDM communication system
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  • Adaptive power distribution method for multi-antenna OFDM communication system

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Embodiment 1

[0054] Embodiment 1: MIMO-OFDM system

[0055] Such as figure 1 shown. Consider a MIMO-OFDM wireless communication system with M transmit antennas and N receive antennas. Assume that the total transmit power of the system is P. At the transmitting end, the value of the adjustable parameter Γ is determined according to the bit error rate required by the system; then, the singular value decomposition is performed on the channel matrix fed back by the receiving end to obtain the channel eigenvalue, left-multiplied matrix and right-multiplied matrix; and then Calculate the initial value of each sub-channel power allocation and bit allocation by formula (3) (4), close the sub-channel whose initial value is less than zero, and use the greedy algorithm to re-allocate the remaining power until all the power has been allocated, generating a complete bit and power allocation table. The system modulates each channel according to the bit number and power of each sub-channel correspond...

Embodiment 2

[0058] Embodiment 2: OFDM wireless local area network

[0059] Such as figure 2 As shown, the system framework is similar to the above MIMO-OFDM system.

[0060] Assume that the total transmit power of the system is P. At the transmitting end, the value of the adjustable parameter Γ is determined according to the bit error rate required by the system; then, the singular value decomposition is performed on the channel matrix fed back by the receiving end to obtain the channel eigenvalue, left-multiplied matrix and right-multiplied matrix; and then Calculate the initial value of each sub-channel power allocation and bit allocation by formula (3) (4), close the sub-channel whose initial value is less than zero, and use the greedy algorithm to re-allocate the remaining power until all the power has been allocated, generating a complete bit and power allocation table. Then the symbol is coded by the right-multiplication matrix, and finally, the coded symbol is modulated by OFDM...

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Abstract

It is a multi-antenna crossing frequency division multiplexing communication system self-adapting power alignment method used in wireless communication field, which comprises the following steps: the transmitting end first aligns transmitting power of each transmitting power based on injection algorism in the communication system; it must close negative power sub-channel and process the transmit bit number for integral process in that each sub-channel only transmit integral bits; it then again aligns the remain power to final alignment results based on greed algorism according to bit transmission maximum rule.

Description

technical field [0001] The invention relates to a method for adaptive power allocation, in particular to a method for adaptive power allocation of a multi-antenna-orthogonal frequency division multiplexing communication system, which is used in the field of wireless communication. Background technique [0002] The multi-antenna (MIMO) system is an efficient wireless transmission system developed in recent years. Compared with the traditional single-antenna (SISO) system, its notable feature is the use of multiple transmitting and receiving antennas between the transmitter and the receiver. constitute multiple uncorrelated wireless channels. Orthogonal Frequency Division Multiplexing (OFDM) is a modulation method that converts high-speed serial data into low-speed parallel data, and uses multiple mutually orthogonal subcarriers to modulate parallel modulation. At present, the MIMO-OFDM system combining the two has been widely used in the fields of wireless local area network...

Claims

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Application Information

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IPC IPC(8): H04J11/00H04L1/02H04L27/26
Inventor 周军章飞舟张海滨宋文涛
Owner SHANGHAI JIAO TONG UNIV
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