US 6,983,029 B2
Blind channel estimation and data detection for PSK OFDM-based receivers
Hossein Alavi, Mississauga (Canada); Mohammad Javad Omidi, Mississauga (Canada); Mehdi Tavassoli Kilani, Mississauga (Canada); and Ahmad Chini, Vaughan (Canada)
Assigned to Maxim Integrated Products, Inc., Sunnyvale, Calif. (US)
Filed on Aug. 27, 2001, as Appl. No. 9/940,381.
Claims priority of provisional application 60/255830, filed on Dec. 15, 2000.
Prior Publication US 2003/0007576 A1, Jan. 09, 2003
Int. Cl. H03D 3/22 (2006.01); H04L 27/22 (2006.01)
U.S. Cl. 375—329 24 Claims
OG exemplary drawing
 
1. A method comprising:
receiving a multi-tone signal by a first fourier transform (FFT) logic;
outputting symbols for each carrier of the multi-tone signal;
computing a complex phase difference between a current symbol and a previous symbol;
separating a real value component (R) from a corresponding imaginary value component (I) forming the complex phase difference;
determining at least one boundary constraint line of a complex phase map for a selected demodulation scheme; and
computing an arithmetic combination of the real value component and the corresponding imaginary value component to detect whether a series of bits falls within a selected region of the complex phase map defined by the at least one boundary constraint line.