Title :
A fast blind sequence estimation in digital communications
Author :
Torlak, Murat ; Hansen, Lars K. ; Xu, Guanghan
Author_Institution :
Dept. of Electr. & Comput. Eng., Texas Univ., Austin, TX, USA
Abstract :
The problem of blindly estimating multiple digital co-channel communication signals using an antenna array is studied in the presence of multipath fading. We develop a fast sequential-estimation algorithm for separating multi-user signals based on the geometric observation made by Hansen and Xu (see Proc. ICASSP´96, p.1085-88, Atlanta, GA, 1996). When the signals are constrained to a finite alphabet, it is possible to visualize the geometric properties of the problem, which can be exploited to sequentially extract the digital co-channel communication signals. We present simulation results comparing the speed and BER performance with different methods.
Keywords :
MIMO systems; array signal processing; digital radio; direction-of-arrival estimation; equalisers; error statistics; fading; multi-access systems; multipath channels; phase shift keying; sequential estimation; BER; BER performance; BPSK; FIR-MIMO systems; antenna arrays; blind joint space-time equalization; fast blind sequence estimation; fast sequential-estimation algorithm; finite alphabet; geometric observation; geometric properties; multi-user signals separation; multipath channels; multipath fading; multiple digital co-channel communication signals; simulation results; speed; Antenna arrays; Bit error rate; Blind equalizers; Deconvolution; Digital communication; Fading; MIMO; Source separation; Visualization; Wireless communication;
Conference_Titel :
Signals, Systems & Computers, 1997. Conference Record of the Thirty-First Asilomar Conference on
Conference_Location :
Pacific Grove, CA, USA
Print_ISBN :
0-8186-8316-3
DOI :
10.1109/ACSSC.1997.680560
