Performance Analysis of PT-MMA and PT-DDMLA and PT-DDAA for OFDM in Wireless Communication

In this paper we introduce a new blind adaptive per tone equalization (PT-MMA) and a new per tone phase error detection and correction (PT-DDMLA & PT- DDAA) that does not use any pilot tones, for OFDM systems. The proposed equalizer scheme consists of a (complex) equalizer per tone. In this scheme, we compare the performance of the per tone multimodulus algorithm (PT-MMA) with per tone decision-directed maximum likelihood algorithm (PT-DDMLA) and per tone decision-directed arctangent algorithm. The PT-MMA performs joint blind equalization and carrier recovery without the need for a separate carrier-recovery system for QAM signal constellations. The PT-MMA compensates for an additional carrier frequency offset (CFO). The results of our simulations indicate that the PT-MMA can correct the phase error, because it implicitly incorporates a phase-tracking loop, which automatically recovers carrier phase and in comparison with PT-DDMLA & PT-DDAA has a better performance from the viewpoint of carrier phase error correction