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Transitional water-filling algorithm

A technology of transmitting power and wireless communication, applied in the field of wireless communication, can solve the problem that the power distribution of the water injection algorithm cannot well meet the real-time requirements, and achieve the requirements of real-time power distribution and power adjustment, reduce energy consumption, and reduce operation time. Effect

Inactive Publication Date: 2014-01-08
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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AI Technical Summary

Problems solved by technology

Obviously, using the binary search algorithm to find μ to realize the power distribution of the water injection algorithm can not meet the real-time requirements well.

Method used

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  • Transitional water-filling algorithm
  • Transitional water-filling algorithm
  • Transitional water-filling algorithm

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] refer to figure 1 , A conceptual understanding diagram of the water injection algorithm. The process of the water injection algorithm is like injecting water into a pool with an uneven bottom. By continuously adjusting the value of the water level, the total amount of water injection does not exceed a certain threshold. The water pool is vertically divided into multiple columns according to the height of the bottom. The higher the bottom of the column, the lower the quality of the sub-channel, and the shallower the depth of the water injected into the column, indicating the poorer quality of the sub-channel. The lower the power allocated on the sub-channel, that is, the less data is transmitted in this channel. On the contrary, if the bottom of the column is lower, it indicates that the quality of the sub-channel is better, so the depth of water injection is deeper, indicating that the more power is allocated on this sub-channel, and the more data that can be transmitt...

Embodiment 2

[0067] In the field of optimization algorithms, the constraints are not only One, and usually faces several other constraints. For example, it is required that the interference to other users caused by the transmission power allocated on each sub-channel does not exceed a certain threshold I max ,Right now where g 1n =[g 11 ,...,g 1N ] T Indicates the channel gain (interference) between the sender and other users. In practical applications, this restriction can be relaxed and become That is to say, the average interference of the transmit power of the sender to other users exceeds the threshold I max The probability of cannot exceed ε. By reducing the total transmitted power, that is, the total power from P max reduced to P max -Ng△ can meet the requirements of the average interference limit.

[0068] Embodiment 2 is the power allocation problem solved by the present invention under OFDM transmission system and Underlay working mode in cognitive radio.

[0069] C...

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Abstract

The invention discloses a water-filling algorithm, which comprises the following steps of: (1) calculating Pn according to a formula, wherein n may be 1, 2, ..., N; (2) counting the number X of Pns less than zero and a total value of the Pns, and setting values of the Pns less than zero to be zero; (3) downwards translating Pns greater than zero; and (4) judging whether all the translated Pns are not less than zero or not, returning to the step (2) if not all the translated Pns are not less than zero, and finishing the algorithm if all the translated Pns are not less than zero. By the water-filling algorithm provided by the invention, the searching of a Lagrange constant is avoided to obtain an optimal power allocation scheme in an over-zero regulation way by utilizing the translation characteristics of the conventional water-filling algorithm, so the complexity of the algorithm is reduced, the requirements of real-time power allocation and power regulation are met, the operation time of the algorithm is shortened, simultaneously energy consumption for the running of the algorithm is reduced and importance to a mobile communication terminal with dependence on a battery for power supply is ensured.

Description

technical field [0001] The invention relates to a transmission power allocation method of a wireless communication sub-channel in the field of wireless communication, in particular to a transmission power allocation method of a wireless communication sub-channel using a translational water filling algorithm. Background technique [0002] In a high-speed transmission system in a wireless environment, the frequency response curve of a wireless channel is mostly non-flat. For example, OFDM technology divides a given frequency band into many orthogonal sub-channels in the frequency domain, and uses a sub-carrier for each sub-channel Modulation, and each subcarrier is transmitted in parallel; different subchannels have different fading characteristics. Another example is that the MIMO technology uses multiple antennas at the transmitting end and the receiving end, and different sub-channels are formed between different transmitting and receiving antenna pairs, and these sub-chann...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04W16/10H04W52/02H04W72/04
CPCY02B60/50Y02D30/70
Inventor 凌翔吴斌潘莉丽鲍志强周荀
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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