OFDM-based electricity-saving method for mobile digital multimedia broadcasting receiver

A technology of multimedia broadcasting and mobile digital, applied in the field of mobile communication, can solve the problem of lowering the power consumption of the receiver, and achieve the effect of reducing power consumption

Active Publication Date: 2010-01-20
FUZHOU ROCKCHIP SEMICON
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Therefore, the prior art does not minimi...

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  • OFDM-based electricity-saving method for mobile digital multimedia broadcasting receiver

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Embodiment Construction

[0021] Receiver structure based on OFDM technology such as figure 1 As shown, the radio frequency signal is converted into a zero-IF or low-IF signal through the tuner, and then converted into a digital signal after being sampled by the ADC, and then decoded before FFT (Fast Fourier Transform), and then converted into a frequency domain signal after FFT, and then decoded after FFT . Decoding before the FFT is basically a data stream that flows straight through (without buffering), so the latency is low and constant. When the pre-FFT decoding module sends the data to the FFT module, a symbol head flag will be generated at the starting position of the OFDM symbol (remove the guard interval), telling the FFT module that this is the starting position of the OFDM symbol. The FFT module performs FFT processing on the entire OFDM symbol, and transforms the signal into the frequency domain. After the FFT, the decoding module generally needs to perform deinterleaving and then process...

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Abstract

The invention relates to an OFDM-based electricity-saving method for a mobile digital multimedia broadcasting receiver. The method comprises the following steps: a channel to be decoded is selected; when an FFT prior-coding module finishes decoding the last OFDM symbol of the channel to be decoded, a master control module starts a counter of an electricity-saving control module, closes clocks of other modules in the FFT prior-coding module and configures a tuner and ADC to be in an electricity-saving mode; and the master control module calculates the number of clock cycles needing stopping according to the next time slot number to be decoded, the next sampling rate, sampling clock offset, and the like and starts gate control clocks of the receiver or switches of the tuner and the ADC only when needing to transmit a channel to be received. The invention separates the gate control clocks of all the modules of the receiver, closes the gate control clocks of all the modules, the tuner and the ADC by stages and uses a simple counter to start the gate control clocks, the tuner and the ADC of the receiver by the stages to further decrease the energy consumption of the receiver.

Description

【Technical field】 [0001] The invention relates to the technical field of mobile communication, and specifically refers to a power saving method of a mobile digital multimedia broadcasting receiver for time-division multiplexing transmission of contents of multiple channels based on OFDM technology. 【Background technique】 [0002] With the development of wireless communication technology, the functions of various wireless communication terminals are increasingly enhanced, and the enhancement of communication terminal functions is bound to consume more power, thereby increasing power consumption. Therefore, the low power consumption design of wireless communication terminals is a technical The goal that technicians in the field have been pursuing. [0003] OFDM (Orthogonal Frequency Division Multiplexing) technology is often used in mobile digital multimedia broadcasting for time-division multiplexing transmission of multiple channel content, and the receiver also receives an ...

Claims

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Application Information

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IPC IPC(8): H04N5/44H04L27/26
Inventor 张善旭陈继晖
Owner FUZHOU ROCKCHIP SEMICON
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