[특허]Interference mitigation in a wireless communication system

[미국특허] Interference mitigation in a wireless communication system 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	H04J-011/00 H04B-007/212 H04L-012/26
출원번호	US-0947283 (2001-09-05)
발명자 / 주소	Anikhindi,Santosh Botterill,Iain
출원인 / 주소	Cisco Technology, Inc.
대리인 / 주소	Inventek
인용정보	피인용 횟수 : 53 인용 특허 : 22

초록 ▼

By virtue of one embodiment of the present invention, dynamic signal to noise ratio measurements made on received signals are used to identify degraded segments of a channel. The degraded segments are then no longer used for transmitting payload data. In the context of an orthogonal frequency division multiplexing (OFDM) communication system, degraded OFDM subchannels, as determined on a real-time basis, are not used to transmit payload data. In an OFDM network where access is shared in the time domain among multiple transmitters and a single allocable time slot includes an integer number of OFDM bursts, the medium access control layer adjusts packet length, and therefore the amount of data to be included in a given slot, in response to the fluctuating number of available subchannels.

대표청구항 ▼

What is claimed is: 1. In a point to multipoint OFDM communication network, a method for operating a central access point, said method comprising: monitoring reception quality in a plurality of OFDM subchannels; designating a selected subchannel as below a quality threshold; and instructing a subscriber unit to not transmit payload data in said selected subchannel, wherein monitoring comprises: receiving a series of OFDM bursts from said subscriber unit; and measuring signal to noise ratio in said plurality of subchannels for each of said series of OFDM bursts, and wherein receiving comprises: receiving said series of OFDM bursts via a plurality of antennas; statistically characterizing noise and/or interference superimposed on data symbols of said OFDM bursts based on predefined training symbols within said OFDM bursts; and determining reception quality based on ratio of noise and/or interference to signal for said data symbols. 2. In a point to multipoint OFDM communication network, a method for operating a subscriber unit, said method comprising: receiving an instruction message from a central access point, said instruction message including information identifying OFDM subchannels to be left unused in future upstream transmissions; encoding data to be transmitted into an encoded packet in a manner that takes into account that there are OFDM subchannels left unused in accordance with said instruction message, and such that the encoded packet has a length that takes into account that there are OFDM subschannels left unused in transmission in accordance with said instruction message; and transmitting said encoded data packet as one or more OFDM burst wherein OFDM subchannels are left unused in accordance with said instruction message. 3. In a point to multipoint OFDM communication network, apparatus for operating a central access point, said apparatus comprising: an OFDM receiver that monitors reception quality in a plurality of OFDM subchannels; and a control processor that designates a selected subchannel as below a quality threshold and instructs a subscriber unit to not transmit payload data in said selected subchannel, wherein said OFDM receiver comprises: a plurality of converters that convert time domain OFDM bursts received from said subscriber unit via a plurality of antennas into frequency domain OFDM bursts; and an antenna combining block that statistically characterizes noise and/or interference superimposed on data symbols of said frequency domain OFDM bursts based on predefined training symbols within said frequency domain OFDM bursts; and wherein reception quality is determined based on ratio of noise and/or interference to signal for said data symbols. 4. In a point to multipoint OFDM communication network, apparatus for operating a subscriber unit, said apparatus comprising: a control processor configured to receive an instruction message from a central access point, said instruction message including information identifying OFDM subchannels to be left unused in future upstream transmissions; an error correction encoder configured to encode data to be transmitted into an encoded packet in a manner that takes into account that there are OFDM subschannels left unused in accordance with said instruction message, and such that the encoded packet has a length that takes into account that there are OFDM subchannels are left unused in transmission in accordance with said instruction message; and an OFDM transmitter configured to transmit said encoded packet as one or more OFDM bursts wherein OFDM subschannels are left unused in accordance with said instruction message.

이 특허에 인용된 특허 (22) 인용/피인용 타임라인 분석

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[미국특허] Interference mitigation in a wireless communication system 원문보기

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[미국특허] Interference mitigation in a wireless communication system 원문보기

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