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Minimum transmitting power adaptive modulating method based on service quality requirement

A technology with minimum transmission power, applied in digital transmission systems, electrical components, error prevention, etc., can solve problems such as high computational complexity, inability to give a closed-form solution to the minimum transmission power algorithm, adverse effects, etc., to achieve low operation effect of complexity

Inactive Publication Date: 2006-05-17
SHANGHAI JIAO TONG UNIV
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  • Description
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Problems solved by technology

This recursive discretization method cannot give a closed-form solution to the minimum transmit power algorithm, and its computational complexity is relatively high, which will adversely affect practical applications

Method used

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  • Minimum transmitting power adaptive modulating method based on service quality requirement
  • Minimum transmitting power adaptive modulating method based on service quality requirement
  • Minimum transmitting power adaptive modulating method based on service quality requirement

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Embodiment Construction

[0019] The technical solutions of the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0020] exist figure 1 The structural block diagram of the adaptive modulation MIMO system with minimum transmit power is given in , at the transmit end, the source bit stream is allocated to each antenna branch through bit allocation, and then the transmit signal is formed by modulation and transmit weighting; at the receive At the end, the received signal is demodulated and multiplexed after being weighted, and finally the received bit stream is obtained. For such a system, the steps of applying the present invention to carry out adaptive modulation are as follows:

[0021] 1. Divide sub-channels:

[0022] For such as figure 1 The shown MIMO system, its signal transceiver model is as follows:

[0023] r=Hs+n (1)

[0024] Among them, r represents the received signal, s represents the tra...

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Abstract

An adaptive modulation method of minimum emission power based on service quality requirement includes giving out closed solution of system minimum emission power problem under channel information feedback condition, carrying out discretization treatment to closed solution and adjusting modulation order of sub channel till current modulation order sun of all sub channels is equal to object transmission rate, confirming that modulation order and emission power of each sub channel at this point is optimum, then finalizing distribution of bit and power.

Description

technical field [0001] The invention relates to a minimum transmission power self-adaptive modulation method based on service quality requirements, which can enable a multiple-input multiple-output system to achieve the service quality required by users with the minimum total transmission power. It belongs to the technical field of wireless communication. Background technique [0002] In recent years, in order to make full use of the capacity provided by MIMO channels as much as possible, adaptive modulation technology has been considered as one of the most effective means. It can adaptively select the bit and power allocation scheme of the transmitter according to the channel state change. At present, the dominant schemes in this regard are all implemented by maximizing the system capacity under the premise of a given total transmission power. The advantage of this type of scheme is that it can ensure that the system can realize data transmission at the maximum possible r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/00
Inventor 何晨王智鹰蒋铃鸽
Owner SHANGHAI JIAO TONG UNIV
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