Reduced complexity MLSE equalizer for M-ary modulated signals

Details Reduced complexity MLSE equalizer for M-ary modulated signals Reduced complexity MLSE equalizer for M-ary modulated signals

2006-08-29

2006-08-29

Kumar, Pankaj (Department: 2611)

Pulse or digital communications

Receivers

Particular pulse demodulator or detector

Reexamination Certificate

active

07099410

ABSTRACT:
The present invention involves demodulation of radio signals modulated with M-ary modulation in the presence of intersymbol interference distortion. The invention presents a method for reducing the number of multiplications needed to implement a maximum-likelihood-sequence-estimation (MLSE) equalizer for signals modulated with M-ary modulation. In exemplary embodiments of the present invention, the number of multiplications is reduced by pre-computing certain values needed for the determination of the branch metric and storing these pre-computed values in a product table. When a branch metric computation is to be made, whether it is an Euclidean branch metric computation or an Ungerboeck branch metric computation, certain multiplication operations are replaced by simple table look-up operations. As a result, the power efficiency and speed of the system are increased. Any receiver that demodulates signals that are modulated with M-ary modulation can be implemented using the present invention. The resulting demodulator will have a lower complexity than existing demodulators.

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“Decision Feedback Sequence Estimation for Continuous Phase Modulation On a Linear Multipath Channel”,IEEE Transactions on Communications, vol. 41, No. 2, Feb. 1993.

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