Patent ID: 8411779

Claim:
A communications system comprising: a transmitter for transmitting signals of at least two channel coded data streams over a common transmission channel; and a receiver for receiving transmitted signals, wherein said transmitter comprises: means for dividing each data stream into at least two sub-streams (or subcarriers) of a data stream; means for individually preprocessing each said sub-stream; and means for post-processing said individually preprocessed sub-streams with at least a subband filter, wherein said means for individually preprocessing comprises: means for a filtering operation using filter coefficients that result in a filter with same frequency and phase response characteristics as a corresponding sub-stream of a second data stream sharing said common transmission channel; and a first processor for interleaving and/or scrambling each said sub-stream using an interleaver and/or scrambler that is different from a corresponding sub-stream of a second data stream sharing said common transmission channel, and wherein said receiver comprises: a second processor for separately deinterleaving and/or descrambling of each of corresponding sub-streams received by multiple receivers, said interleaving and/or descrambling of sub-streams corresponding to the interleaving processing and/or the scrambling process performed at said preprocessing of target signal of a target signal of the transmitter; and a plurality of inverse filters for filtering each sub-stream, said plurality of inverse filters each having inverse frequency and phase response characteristics of a filter disposed at a corresponding substream of the transmitter.