US 5,748,669 A · Method and apparatus for transmitting information converted to spread spectrum signal

Abstract

Herein disclosed are a method and an apparatus for transmitting information converted to a spread spectrum signal, the information being coded to form an information signal before being converted to the spread spectrum signal. The spread spectrum signal is produced on the basis of the information signal and a spreading modulation code which is a pattern of frequency hopping or a pseudo-random noise code well known as PN code. The spread spectrum signal is provided with a signal propagation character when the spread spectrum signal is transmitted. The signal propagation character of the spread spectrum signal is varied while the spread spectrum signal is transmitted, thereby making it possible to reduce the influence of fading effects without applying a diversity system to a spread spectrum receiver and accordingly have the spread spectrum receiver decreased in size, weight and cost.

Claims30

Dependent claims

A method of transmitting information converted to a spread spectrum signal, said information being coded to form an information signal represented by a sequence of bits before being converted to said spread spectrum signal, comprising the steps of:

(a) generating a spreading modulation code;
(b) producing said spread spectrum signal on the basis of said information signal and said spreading modulation code;
(c) having said spread spectrum signal provided with a signal propagation character and transmitting said spread spectrum signal;
(d) varying the signal propagation character of said spread spectrum signal while said spread spectrum signal is transmitted;
and
(e) repeating said step (d) at least one time during the duration of each bit of said information signal.

3 more elements

An apparatus for transmitting information converted to a spread spectrum signal, said information being coded to form an information signal represented by a sequence of bits before being converted to said spread spectrum signal, comprising:

code generating means for generating a spreading modulation code;
signal producing means for producing a spread spectrum signal on the basis of said information signal and said spreading modulation code;
signal transmitting means for having said spread spectrum signal provided with a signal propagation character and transmitting said spread spectrum signal;
and
character varying means for varying the signal propagation character of said spread spectrum signal while said spread spectrum signal is transmitted by said signal transmitting means,
said character varying means operating to vary the signal propagation character of said spread spectrum signal at least one time during the duration of each bit of said information signal.

3 more elements

An apparatus for transmitting information converted to a frequency hopping spread spectrum signal having a plurality of frequency components, said information being coded to form a information signal represented by a sequence of bits before being converted to said frequency hopping spread spectrum signal, comprising:

pattern generating means for generating a pattern of frequency hopping;
signal producing means for producing said frequency hopping spread spectrum signal on the basis of said information signal and said pattern of frequency hopping;
and
signal transmitting means for having said frequency hopping spread spectrum signal provided with a signal propagation character and transmitting said frequency hopping spread spectrum signal, said signal transmitting means operating to vary the signal propagation character of said frequency hopping spread spectrum signal in accordance with said pattern of frequency hopping.

1 more element

Dependencies are inferred from the claim text.

Method and apparatus for transmitting information converted to spread spectrum signal

Life of this patent

Method and apparatus for transmitting information converted to spread spectrum signal

Life of this patent

Abstract

Claims30