Methods and apparatus for determining minimum cyclicprefix...

Details Methods and apparatus for determining minimum cyclicprefix... Methods and apparatus for determining minimum cyclicprefix...

2006-01-10

2006-01-10

Pezzlo, John (Department: 2662)

Multiplex communications

Generalized orthogonal or special mathematical techniques

Particular set of orthogonal functions

C370S339000

Reexamination Certificate

active

06985433

ABSTRACT:
Methods and apparatus for generating and transmitting frequency division multiplexed signals are described. Each transmitted FDM signal is generated by combining, e.g., multiplexing, a plurality of individual analog subcarrier signals together. Individual analog subcarrier signals are generated by processing one or more digital signals, e.g., symbols plus a cyclic prefix for each symbol, corresponding to the subcarrier to generate an analog subcarrier signal there from. A cyclic prefix incorporated into subcarrier signals is designed to be of sufficient length that it covers delays introduced by filters in the individual subcarrier signal paths and common signal path. The incorporated cyclic prefix has a minimum duration determined as a function of several group signal dealys including a common signal path group signal delay and a communications channel group signal delay.

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J. Vankka, M. Kosunen, J. Hubach, and K. Halonen, “A Cordic-based Multicarrier QAM Modulator”, Global Telecommunications Conference—Globecom '99, General Conference (Part A), pp. 173-177.

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