Methods and apparatus for receiving OFDM signals

Details Methods and apparatus for receiving OFDM signals Methods and apparatus for receiving OFDM signals

2008-01-29

2008-01-29

Nguyen, Chau (Department: 2616)

Multiplex communications

Generalized orthogonal or special mathematical techniques

Particular set of orthogonal functions

C370S210000, C370S350000, C370S503000

Reexamination Certificate

active

10405519

ABSTRACT:
A receiver for OFDM signals estimates the carrier frequency offset from a training sequence of symbols in the received signal, by minimising a cost function which is designed to exploit statistically the information in the symbols. In a first firm, the cost function includes terms generated from the received signal at pairs of symbols which are not just nearest-neighbours in the symbol sequence. For example, the cost function may include not just terms generated between nearest neighbour symbols, but between all pairs of symbols. In a second form, the cost function includes terms which describe the relationship between the corresponding elements within different symbols. Thus, the invention makes it possible to obtain much more statistics than in conventional methods from the same training sequence. This can increase signal-to-noise ratio (SNR) as compared to prior art systems. Accordingly, a more accurate estimate of carrier frequency offset can be achieved.

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