Binary-valued signal modulation compression for high speed...

Details Binary-valued signal modulation compression for high speed... Binary-valued signal modulation compression for high speed...

2003-01-03

2008-07-22

Tran, Khanh C (Department: 2611)

Pulse or digital communications

Spread spectrum

Direct sequence

Reexamination Certificate

active

07403559

ABSTRACT:
A method of forming a cross-correlation functionR⁡(τ)=∑N2k=N1⁢r⁡(k)⁢m⁡(k-τ),mathematically as an inner product of the samples of a received signal r(t) and a replica of the signal modulation function m(t), with a computational burden reduced by many orders of magnitude in pseudonoise (PN) coded ranging applications is accomplished by a two step process. First, a single weighted sum of the signal samples forms a small dimension vector, of the order of tens of elements. Second, the inner product of this vector and vectors of the same dimension of samples of the signal modulation generating function, delayed by arbitrarily many values of the delay parameter τ, result in fine delay resolution correlation function values. The process comparatively entails a relatively small computational burden, does not compromise fidelity, and makes real-time optimal range estimation practical.

REFERENCES:
patent: 5031191 (1991-07-01), Hiramatsu et al.
patent: 6731144 (2004-05-01), Endo
patent: 6859078 (2005-02-01), Choi
patent: 7103095 (2006-09-01), Papasakellariou

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