ApplicationNo.: 98 1 18460 Application Date: 1998/08/ 19.
Public Day: 1999/02/24 Announcement Day:
PublicationNo.: 1209007 AnnouncementNo.: 1 123997
Authorization date: authorization announcement date: 2003- 10-8.
Patent category: country of invention, province and city code: KR[ Korea]
Organization code: 1 1 105 [cross-reference table] Agent: Lv Zhangxiao.
Name of invention: Equalization method and equalizer of orthogonal frequency division multiplexing receiver.
International classification number: H04J 1/02
Category number: 39B
Inventor: Yuan Yi
Applicant: Samsung electronics co., ltd
Applicant's address: Gyeonggi Province, South Korea
Postal code:
abstract:
Equalizer and equalization method for orthogonal frequency division multiplexing (OFDM) receiver. Includes a channel characteristic updater that updates the subchannel characteristic values of the scattered pilots with the period of 12 subchannels received in each symbol, maintains the previous subchannel characteristic values of the remaining scattered pilots, and obtains the channel characteristic values of the scattered pilot positions with the period of 3 subchannels; An interpolator that estimates subchannel characteristics of data other than the scattered pilots by using channel characteristic values at scattered pilot positions with three subchannel periods, and provides all subchannel characteristic values; And a digital filt for compensating that channel distortion of the receive multicarrier by using all the estimated subchannel characteristics. The amount of calculation can be reduced by reducing the distance between scattered pilots.
Main propositions:
An equalization method for compensating channel distortion in a plurality of carriers transmitted through a plurality of subchannels by using scattered pilots with a first predetermined number of symbol periods includes the following steps: (a) extracting scattered pilots from a plurality of received carriers and estimating channel characteristic values in the extracted scattered carrier positions; (b) providing channel characteristic values at scattered pilot positions having a period of a second predetermined number of subchannels in each symbol, and maintaining the previous channel characteristic values in the remaining scattered pilots; (c) estimating the characteristics of subchannels transmitting data between dispersed pilots by using channel characteristic values in dispersed pilot positions with a period of a third predetermined number of subchannels, and providing characteristic values of all subchannels; And (d) compensating the channel distortion of the received multiple carriers according to the characteristic values of all subchannels.
Priority projects:
3966 1/97
PCT clause