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Tone sensing and nulling in frequency-hopped multicarrier system

A tone and communication system technology, applied in the field of OFDM signals, can solve problems affecting the reception of UWB signals

Inactive Publication Date: 2008-10-01
WIONICS RES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Further, these other transmissions may also adversely affect the reception of UWB signals

Method used

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  • Tone sensing and nulling in frequency-hopped multicarrier system
  • Tone sensing and nulling in frequency-hopped multicarrier system
  • Tone sensing and nulling in frequency-hopped multicarrier system

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Experimental program
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Embodiment Construction

[0017] figure 1 Is the flow chart of the process of realizing tone nulling. The tone nulling process can reduce the interference effect on UWB communication and reciprocally reduce the interference effect of UWB communication on other communication systems.

[0018] In block 110, the process determines the tones or subcarriers to be masked for use in UWB communications. At block 120 , the process masks the tones or subcarriers determined in block 110 . This masking removes the marked tone from UWB communication or reduces its importance in the communication system. After masking the determined pitch, the process returns.

[0019] At block 110, the tones to be masked may be predetermined tones, and may be tones that a regulatory body determines may not be used by the UWB communication system. Tones may also be predefined according to other criteria.

[0020] Alternatively, the tone to be masked can be found in figure 1 dynamically determined in block 110 of the pitch null...

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PUM

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Abstract

A method and system for removing frequencies interfering with a UWB OFDM receiver from transmission frequencies of the UWB communication. A sensing mechanism is added to the receiver that develops an energy histogram for the frequencies in a received signal and develops a tone mask for masking the interfering frequencies. The tone mask is applied after a mapping stage in the transmitter of the UWB communication and removes the interfering frequencies from the transmitted signal. Various criteria based on energy averaging are used to identify and null and remove the interfering frequencies.

Description

technical field [0001] The present invention relates generally to Ultra Wideband (UWB) communications and Orthogonal Frequency Division Multiplexing (OFDM) signals in UWB communications, and more particularly to interference tone suppression in OFDM UWB communications systems. Background technique [0002] Typically UWB transmissions transmit signal bandwidths that exceed the lesser of 500 MHz or 20% of the bandwidth. Thus, aggregation of narrowband carriers of at least 500 MHz, eg in OFDM, can access the UWB spectrum. The OFDM carrier signal is the sum of a large number of orthogonal subcarriers (subcarrier). The baseband data on each subcarrier is independently modulated. A complex baseband signal is typically used to modulate the main RF carrier. OFDM modulation and demodulation can be implemented with a digital filter bank, usually using a Fast Fourier Transform (FFT) scheme. Examples of OFDM symbol structures and frequency hopping patterns are disclosed in the Multi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B1/10
CPCH04L27/2626H04B1/713H04B1/715H04L5/0007H04L5/0062H04L25/0224H04L27/2602H04L27/2647H04L27/26265
Inventor T·艾图尔S·提布林克R·H·马海德瓦帕R·颜
Owner WIONICS RES