Secure channel sounding

The method of any preceding claim, wherein step [1.1] further comprises:

• [1.1.2] developing a set of m metric correlations by auto-correlating each of the m codes comprising the first code set;
• [1.1.3] developing a metric by accumulating at least a selected portion of the m metric correlations, the metric being selected to measure the degree to which the first code set is group complementary;
• [1.1.4] if the metric indicates that the first code set is not substantially group complementary, selectively modifying the first code set;
• and
• [1.1.5] repeating steps [1.1.2] through [1.1.4].

The method of any preceding claim, further comprising:

• [1.3] a third process comprising the steps of:
• [1.3.1] in a selected one of T and R:
• [1.3.1.1] developing a second code set comprising each of the m codes comprising the first code set;
• [1.3.1.2] developing a set of m metric correlations by correlating each of the m codes comprising the first code set with a respective one of the codes comprising the second code set;
• [1.3.1.3] developing a metric by accumulating at least a selected portion of the m metric correlations, the metric being selected to measure the degree to which the first code set and the second code set are group complementary;
• [1.3.1.4] if the metric indicates that the first code set and the second code set are not substantially group complementary, selectively modifying the second code set;
• and
• [1.3.1.5] repeating steps [1.3.2] through [1.3.4];
• wherein step [1.2.1.1] is further characterized as:
• [1.2.1.1] receiving from a selected one of the first and third processes a transmitter code set comprising a respective one of the first code set and the second code set;
• and
• wherein step [1.2.2.1] is further characterized as:
• [1.2.2.1] receiving from a selected one of the first and third processes a receiver code set comprising a respective one of the first code set and the second code set.

The method of any preceding claim, wherein step [1.1.1] is further characterized as:

• [1.1.1] pseudo-randomly generating, as a function of a seed, a first code set comprising m codes and k dummy codes;
• and
• wherein step [1.2.2.3] is further characterized as:
• [1.2.2.3] developing a set of m channel correlations by correlating each of the m codes of the receiver code set with the corresponding m code of the channel-distorted form of the transmitter code set.