Boundary tracking apparatus and related method of OFDM system
AssigneeRealtek Semiconductor Corp.
InventorsChun-Ming Cho, Kuang-Yu Yen
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Abstract
A boundary tracking method applied in an OFDM receiver includes generating a plurality of demodulated signal sets corresponding to part of sub-carriers of a packet according to different boundaries with different positions located at the packet, determining the most precise one of the boundaries according to a plurality of inter-symbol interference (ISI) values according to the demodulated signal sets, and calibrating a timing of a currently utilized boundary.
Claims24
A boundary tracking apparatus of an OFDM (Orthogonal Frequency Division Multiplexing) receiver, the OFDM receiver receiving at least one of data blocks corresponding to a plurality of sub-carriers according to a current timing boundary, the plurality of sub-carriers comprising a plurality of pilot sub-carriers and a plurality of data sub-carriers, and the boundary tracking apparatus comprising:
- a first data acquisition module for receiving at least one of the data blocks according to a first timing boundary, and generating a first decoded data set according to a plurality of specific sub-carriers, wherein the plurality of specific sub-carriers are a part of the plurality of sub-carriers;
- a second data acquisition module for receiving at least one of the data blocks according to a second timing boundary distinct from the first timing boundary, and generating a second decoded data set according to the plurality of specific sub-carriers;
- an interference detecting module coupled to the first and the second data acquisition modules for respectively generating a first inter-symbol interference and a second inter-symbol interference according to the first decoded data set and the second decoded data set;
- and
- a timing controller for adjusting the current timing boundary according to the first and second inter-symbol interferences.
A boundary tracking method of an OFDM receiver for receiving at least one of data blocks corresponding to a plurality of sub-carriers according to a current timing boundary, the sub-carriers comprising a plurality of pilot sub-carriers and a plurality of data sub-carriers, the boundary tracking method comprising:
- receiving at least one of the data blocks according to a first timing boundary, and generating a first decoded data set according to a plurality of specific sub-carriers, wherein the plurality of specific sub-carriers are a part of the plurality of sub-carriers;
- receiving at least one of the data blocks according to a second timing boundary distinct from the first timing boundary, and generating a second decoded data set according to the plurality of specific sub-carriers;
- respectively generating a first inter-symbol interference and a second inter-symbol interference according to the first decoded data set and the second decoded data set;
- and
- adjusting the current timing boundary according to the first inter-symbol interference and the second inter-symbol interference.
Dependencies are inferred from the claim text.