Adaptive time diversity and spatial diversity for OFDM

Details Adaptive time diversity and spatial diversity for OFDM Adaptive time diversity and spatial diversity for OFDM

2006-01-10

2006-01-10

Phunkulh, Bob A. (Department: 2661)

Multiplex communications

Generalized orthogonal or special mathematical techniques

Particular set of orthogonal functions

C370S210000, C375S267000

Reexamination Certificate

active

06985434

ABSTRACT:
An adaptable orthogonal frequency-division multiplexing system (OFDM) that uses a multiple input multiple output (MIMO) to having OFDM signals transmitted either in accordance with time diversity to reducing signal fading or in accordance with spatial diversity to increase the data rate. Sub-carriers are classified for spatial diversity transmission or for time diversity transmission based on the result of a comparison between threshold values and at least one of three criteria. The criteria includes a calculation of a smallest eigen value of a frequency channel response matrix and a smallest element of a diagonal of the matrix and a ratio of the largest and smallest eigen values of the matrix.

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