Method and device for performing modulation and power control on wireless video transmission
A wireless video and power control technology, applied in power management, wireless communication, advanced technology, etc., can solve the problem of high power consumption in video transmission and achieve the effect of reducing power consumption
Active Publication Date: 2010-08-11
SHENZHEN INST OF ADVANCED TECH
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[0006] In order to solve the problem of high power consumption in video transmission, it is necessary to provide a modulation and power control method for wireless video transmission
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[0024] figure 1 It is a working flowchart of a modulation and power control method for wireless video transmission. The modulation and power control method of wireless video transmission first calculates the modulation level b with the lowest energy consumption according to the current channel conditions opt , and then judged by b opt Whether it will cause data buffer overflow at the receiving end or discontinuous playback. If yes, then adjust the modulation level accordingly; otherwise, use b opt to modulate. After the modulation order is determined, it will be in the period T 1 remain unchanged. Next calculate the cut-off threshold h 0 , this is because channel conditions are constantly changing, in order to ensure communication quality and save power consumption, it is necessary to adaptively adjust the transmit power. If the channel condition becomes better, the transmit power will be reduced; if the channel condition becomes worse, the transmit power will be increa...
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The invention relates to a method and a device for performing modulation and power control on wireless video transmission. The method for performing the modulation and power control on the wireless video transmission comprises the following steps: according to a channel attenuation value and a distance between a transmitter and a receiver and calculating a modulation level bopt with lowest energyconsumption, wherein bopt makes the transmission energy consumption Etrans of a radio frequency front end equal to the lowest energy consumption; selecting a proper modulation level for modulation according to the modulation level with the lowest energy consumption; calculating a stoppage threshold h0 according to the selected modulation level and the distance between the transmitter and the receiver, wherein h0 is a channel attenuation stoppage threshold for adjusting whether to perform transmission power compensation or not; and adjusting the transmission power according to the stoppage threshold h0 and the channel attenuation value. In the method and the device, a modulation mode and signal transmission power are adjusted in real time by taking channel information, video stream code rate change and the idle condition of a buffer area of the receiver into account in real time, so that the power consumption of the video transmission is greatly reduced under the condition of ensuring signal transmission reliability and video play continuity.
Description
【Technical field】 [0001] The invention relates to the field of wireless communication, in particular to a modulation and power control method for wireless video transmission, and also relates to an adaptive modulation and power control device for wireless video transmission. 【Background technique】 [0002] With the rapid development of wireless multimedia services, it will face two major obstacles, namely the limitation of transmission bandwidth and battery life. The current low-power video transmission schemes start with source and channel coding. However, according to the analysis of M. Srivatsava in the book "Power-aware Communication Systems", 75% of the total energy consumption of wireless communication systems is contributed by the RF front-end Therefore, optimizing the energy consumption of source and channel coding cannot solve the fundamental problem of low-power transmission. [0003] Adaptive modulation (Adaptive Modulation) and power control (Power Adaptation) c...
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IPC IPC(8): H04W52/02H04W52/24H04W52/26H04W52/52
CPCY02B60/50Y02D30/70
Inventor 乔登宇李烨
Owner SHENZHEN INST OF ADVANCED TECH