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Mizui et al. proposed a vehicle-to-vehicle communication and ranging system by multiplying the bit information to the spread spectrum (SS) code and measuring the phase shift of the SS code [9].
Then, a new SS code is generated.
So it is possible that two or more users with the same SS code conflict.
The spread spectrum (SS) code is robust against multiuser and noise.
Assume there are n users in our network and the SS code length is N, then the probability of no SS code conflict is given by Eq. 2. P=frac{N!}{N^{n} N-n)!} N-n.
For communication application, not only the SS code but also the location information will be used to distinguish different users. .
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Also, several certain SS codes should be reserved for special applications.
Kirovski and Malvar [5] have proposed a new steganographic scheme, called Spread Spectrum (SS) coding method.
For example, some SS codes should be assigned to broadcast emergency information.
N different users can be allocated N different unique SS codes with the length N. In the mobile communication network applying code division multiple access (CDMA), the users' SS codes are assigned by the base station.
However, in contrast to LSB coding, the SS coding scheme spreads the secret message using a code independent from the concrete cover signal.
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