A decision-directed constant modulus algorithm for higher-order source constellations
Acoustics, Speech, and Signal Processing, 2000. ICASSP '00. Proceedings. 2000 IEEE International Conference（2000）
Abstract
This paper discusses methods for calculating and implementing the update error term for the popular blind equalization algorithm known as Godard's (1980) algorithm, or the constant modulus algorithm (CMA), without the use of multipliers so that the chip area and signal latency are both substantially reduced. A decision-directed CMA update term is derived for higher-order (non-constant modulus) source alphabets. The modified update error term can be calculated using a look-up table in place of costly multipliers and adders. Baseband and passband implementations for one-dimensional and two-dimensional signaling are discussed.
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Key words
chip area,popular blind equalization algorithm,modified update error term,costly multiplier,constant modulus algorithm,decision-directed constant modulus algorithm,non-constant modulus,paper discusses method,look-up table,higher-order source constellation,update error term,decision-directed cma update term,quadrature amplitude modulation,blind equalization,quantization,chip,passband,robustness,decision theory,look up table,error correction,higher order,baseband
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