Patent ID: 8391336

Claim:
A transmitter comprising: (a) a pulse shaper for generating an input pulse that is a convolution of a kernel parametrized by a bit length and a spreading sequence parametrized by at least one parameter pair that consists of a spreading length and a sparsity, wherein said bit length and said at least one parameter pair form an ordered set that satisfies at least one condition selected from the set consisting of: (i) a first said sparsity is different from said bit length and (ii) when said ordered set includes a plurality of said spreading lengths and said sparsities, then at least one said sparsity subsequent to said first sparsity is different from a product of an immediately preceding spreading length and an immediately preceding sparsity; (b) a mechanism for transforming said input pulse to a transmitted pulse; and (c) a transducer for launching said transmitted pulse as a signal propagating in a medium.