Channel estimating reference signal processor for communication

Details Channel estimating reference signal processor for communication Channel estimating reference signal processor for communication

1978-08-11

1980-08-12

Blum, Theodore M.

Communications: radio wave antennas

Antennas

Balanced doublet - centerfed

343100CL, H04B 700

Patent

active

042175860

ABSTRACT:
A spread spectrum communication adaptive array antenna processor is disclosed which can acquire and remain synchronized to a pseudo-noise (PN) signal transmitted in a multipath signal environment. The plurality of antennas which receive rf signals are individually associated with mixing circuitry which reduces the received signals to IF frequencies. The IF signals are fed into the adaptive filtering portion of the adaptive signal processor which contains circuits to generate an adaptive weight corresponding to each antenna element. An array signal is formed by summing the products of each IF signal with a filter weight corresponding to each antenna element generated within each respective adaptive loop. The adaptive signal processor utilizes the complex conjugate of the error feedback signal which is then multiplied by each respective IF signal. The complex conjugate of this integrated product forms each filter weight. A channel estimator generates an adaptive reference signal which inclues the essential multipath characteristics of the received signal. By using this reference signal in conjunction with the array signal generated by the adaptive filtering portion of the processor, the adaptive array can form an appropriate main beam without prior knowledge of the signal propagation direction.

REFERENCES:
patent: 3766559 (1973-10-01), Butcher, Jr. et al.
patent: 3905009 (1975-09-01), Hughes et al.
patent: 3967279 (1976-06-01), Zeger
McGuffin et al., Multipath Spread-Spectrum Signal Identification for Adaptive Array Processing, SI-646, a paper presented at Naecon 76, May 18-20-76, Dayton, Ohio.

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