Title :
Blind estimation of direct sequence spread spectrum signals in multipath
Author :
Tsatsanis, Michail K. ; Giannakis, Georgios B.
Author_Institution :
Dept. of Electr. & Comput. Eng., Stevens Inst. of Technol., Hoboken, NJ, USA
fDate :
5/1/1997 12:00:00 AM
Abstract :
Self-recovering receivers for direct-sequence spread-spectrum signals with unknown spreading codes are discussed in this paper. Applications include signal interception, jamming, and low probability of intercept (LPI) communications. A multirate/multichannel, discrete-time model of the spread spectrum signal is introduced, which establishes links with array processing techniques. Borrowing blind channel estimation ideas, which were originally developed in the context of fractionally spaced equalizers or receivers with multiple antennas, linear solutions are obtained that are independent of the input distribution. The signal interception problem is further studied, and a zero-forcing (ZF) receiver/equalizer is proposed to recover the transmitted data. Its performance is analyzed, and some illustrative simulations are presented
Keywords :
array signal processing; direction-of-arrival estimation; discrete time systems; equalisers; fading; jamming; multipath channels; probability; pseudonoise codes; radio receivers; signal processing; spread spectrum communication; LPI communications; array processing techniques; blind channel estimation; direct sequence spread spectrum signals; discrete-time model; fractionally spaced equalizers; input distribution; jamming; linear solutions; low probability of intercept; multipath; multiple antennas; multirate/multichannel model; performance analysis; self-recovering receivers; signal interception; simulations; spreading codes; zero-forcing receiver/equalizer; Blind equalizers; Estimation; Finite impulse response filter; Jamming; Matched filters; Multiaccess communication; Noise generators; Performance analysis; Signal processing algorithms; Spread spectrum communication;
Journal_Title :
Signal Processing, IEEE Transactions on
