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OFDM signal transmitting power division method

A technology of signal transmission and distribution method, which is applied in the field of OFDM signal transmission power distribution, which can solve the problems of power waste and power distribution method not given, and achieve the effect of reducing the calculation burden

Inactive Publication Date: 2010-02-03
SUN YAT SEN UNIV
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Problems solved by technology

This algorithm can ensure that the bit error rate can meet the requirements of the system, and the calculation amount is much smaller than the greedy algorithm mentioned above. Evenly distribute the power to each sub-channel, which will inevitably cause the power on some of the sub-channels to be wasted unnecessarily

Method used

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  • OFDM signal transmitting power division method
  • OFDM signal transmitting power division method
  • OFDM signal transmitting power division method

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Embodiment Construction

[0028] The main parameters of the OFDM signal transmission power allocation method include the R required by the system, the immediate channel gain of the system, and the threshold value of the bit error rate set by the system. The bit error rate requirement is relatively fixed, that is, the bit error rate threshold set by the system The value of R remains unchanged for a long period of time; the R required by the system changes more frequently according to real-time needs; the immediate channel gain of the system changes all the time. Therefore, the present invention divides the OFDM signal transmission rate allocation method into a preset stage and a real-time stage.

[0029] As long as the bit error rate requirements of the system have been determined, it can enter the presetting stage. In the preset stage, a R is given in advance, and under the limitation of the bit error rate requirement of the system, for a certain H 2 a, you can use the greedy algorithm to calculate se...

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Abstract

The invention aims at providing an OFDM signal transmitting power division method which is capable of following real-time change of a time-varying channel and low in power consumption. The provided OFDM signal transmitting power division method is divided in to a preset stage and a real-time stage. In the preset stage, Pbit-H<2>a correspondence under optimal power division is obtained by estimation. In the real-time stage, the Pbit-H<2>a correspondence is utilized, corresponding Pbit is rapidly obtained according to R required by system and instant H<2>a, further total initial transmitting power is determined, initial power is allocated to each sub channel according to ratio of square of gain of each sub channel, and greedy algorithm is adopted on the basis.

Description

technical field [0001] The invention relates to a method for allocating OFDM signal transmission power. Background technique [0002] OFDM technology divides the frequency selective fading channel into several flat fading sub-channels, and the sub-carriers on each sub-channel can independently select the modulation and coding methods, such as BPSK, QPSK, 16QAM and 64QAM. A modulation and coding scheme that contains more bits in one cycle consumes more transmit power (hereinafter referred to as power). OFDM's adaptive modulation and coding (AMC=Adaptive Modulation and Coding) technology is characterized by adjusting the modulation and coding method according to the time-varying nature of the wireless channel. must not be higher than the set threshold value) under the given premise, to achieve the maximum transmission rate at a given power, or the minimum power at a given transmission rate. Under the premise that the bit error rate requirements of the system and the target t...

Claims

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Application Information

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IPC IPC(8): H04W52/24H04W52/26H04L27/26
Inventor 何毅张琳
Owner SUN YAT SEN UNIV
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