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Electrical source switchin-off within an OFDM protective frequency band

A technology for protecting signals and symbols, applied to electrical components, multi-frequency code systems, power management, etc., can solve problems such as reducing the data rate of a given bandwidth

Inactive Publication Date: 2008-06-04
KONINKLIJKE PHILIPS ELECTRONICS NV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, using a guard signal reduces the data rate for a given bandwidth

Method used

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  • Electrical source switchin-off within an OFDM protective frequency band
  • Electrical source switchin-off within an OFDM protective frequency band
  • Electrical source switchin-off within an OFDM protective frequency band

Examples

Experimental program
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Embodiment Construction

[0018] Referring first to FIG. 1 , the receiver circuit 1 comprises an antenna 2 whose output is connected to a first input of an amplifier 4 . The output of amplifier 4 is connected to a first signal input of mixer 6 . An output of a voltage controlled oscillator (VCO) 8 is connected to a second signal input of a mixer 6 . The output of the mixer 6 is connected to the signal input of a low-pass filter 10 . The output of the low-pass filter 10 is connected to the signal input of an analog-to-digital converter (ADC) 12 . The output of ADC 12 is connected to the signal input of demodulator 14 . The data output of demodulator 14 is connected to other circuitry (not shown). The demodulator 14 also has a second output connected to an input of a power control unit (PCU) (20). The control output of the PCU 20 is connected in total to the control input of the demodulator 14, the control input of the ADC 12, the control input of the low-pass filter 10, the control input of the VCO ...

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Abstract

A receiver (1) operable to receive OFDM symbols comprises an antenna (2), a receive chain (21) and a power control unit (PCU) (20). The power control unit (20) has a control output connected to control inputs of the components of the receive chain (21) . OFDM symbols incident on the antenna (2) comprise a main signal and a guard signal, where the guard signal is a cyclic extension of the main signal. The control output of the PCU (20) is arranged to be at logic level '1 ' during reception of the main signal and at logic level '0' during reception of the guard signal. Thus the PCU (20) refrains from operating components of the receive chain (21) during reception of the guard signal. This can save power in the receiver (1) .

Description

technical field [0001] The invention relates to a method of operating a receiving device for receiving data present within OFDM symbols, as well as a corresponding device. Background technique [0002] Orthogonal Frequency Division Multiplexing (OFDM) is a powerful technique for high data rate wireless communications. A data sequence consisting of a series of symbols is divided into multiple subcarriers. Generally, the number of subcarriers can be tens to thousands. The symbols are divided among the subcarriers. Therefore, the symbol rate on each subcarrier is significantly lower than the data rate on the original channel. In this way, inter-symbol interference (i.s.i.) caused by channel dispersion (Channel Dispersion) can be greatly reduced. These subcarriers are mutually orthogonal. Using orthogonal subcarriers ensures that they remain independent of each other. In the receiver, each subcarrier is demodulated separately and the original data sequence is reconstructed...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B1/16H04L27/26
CPCH04L27/2607H04W52/0216H04W52/0229Y02B60/50Y02D30/70
Inventor R·J·考德威尔
Owner KONINKLIJKE PHILIPS ELECTRONICS NV