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Power allocation method for modulation constrained system

A technology of modulation and coding mode and power, which is applied in the power distribution field of MIMO-OFDM system, can solve problems such as power loss, and achieve the effect of ensuring system capacity and saving system power

Active Publication Date: 2009-07-22
DATANG MOBILE COMM EQUIP CO LTD
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Problems solved by technology

However, the constellation diagram sizes of different modulation orders are discrete, and the transmission power allocation is also the result of quantization. If a power value corresponds to between two modulation and coding methods, only the lower modulation and coding method can be used. there will be power loss
This is a common shortcoming of current power allocation algorithms

Method used

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  • Power allocation method for modulation constrained system
  • Power allocation method for modulation constrained system
  • Power allocation method for modulation constrained system

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Embodiment Construction

[0047] In order to make the purpose, technical means and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0048] The basic idea of ​​the present invention is: when performing power allocation, on the one hand, the existing power allocation algorithm is used for power allocation, and on the other hand, according to the highest modulation and coding mode, the maximum power allocated to each sub-channel is limited, thereby avoiding power waste.

[0049] figure 1 It is an overall flowchart of the power allocation method of the modulation limited system in the present invention. like figure 1 As shown, the method includes:

[0050] Step 101: Determine the maximum transmission rate of each sub-channel according to the highest modulation and coding mode that each sub-channel in the system can achieve.

[0051] Step 102 , according to the eigenvalue matrix of the downlink ch...

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Abstract

The invention discloses a power splitting method for modulating a limited system, including the following steps: a. the maximum transmission speed of each sub-channel is determined according to the maximum modulation coding manner; b. a sending terminal arranges each sub-channel according to down channel eigenvalue matrix so that the strongest sub-channel is used as the current sub-channel and the system gross power is used as the current splitting power; c. the sending terminal counts the original power of the current sub-channel and the saturation power of the current sub-channel so that the actual transmission power of the sub-channel is determined according to the minimum value of original power and saturation power; d. the sending terminal uses the difference of the current splitting power and the actual transmission power of the current sub-channel as new current splitting power, and whether the current sub-channel is a subweak sub-channel is judged; if so, the current splitting power is distributed to the weakest sub-channel and the process is finished; or, the next sub-channel is used as the current sub-channel and the step c is returned back. The application of the method in the invention can guarantee system volume and meanwhile save system power.

Description

technical field [0001] The present invention relates to multiple-input multiple-output (MIMO)-orthogonal frequency division multiplexing (OFDM) system technology, in particular to a modulation-limited MIMO-OFDM system power allocation method. Background technique [0002] A multiple-input multiple-output (MIMO) system is a communication system that uses multiple antennas at the sending and receiving ends. The spatial multiplexing technology of the MIMO system is to transmit different data streams on different antennas. The spatial multiplexing technology can be used without increasing the bandwidth. The capacity and spectrum efficiency of the communication system are doubled in the case of the MIMO system, which truly reflects the essence of the capacity improvement of the MIMO system. [0003] By decomposing the channel, we can equivalent the channel into several independent parallel sub-channels, and transmit information independently through these parallel spatial sub-cha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26H04B7/005
CPCY02D30/70
Inventor 陈文洪吴群英
Owner DATANG MOBILE COMM EQUIP CO LTD
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