Communication system, transmitter, receiver and multiple access method
First Claim
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1. 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, andwherein 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.
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Abstract
In a communications system including a transmitter for transmitting signals over a transmission channel and a receiver for receiving the signals, the transmitter includes: a filter for filtering a modulated signal to modify amplitude and phase characteristics of the modulated signal; and a first processor for performing interleaving process and/or scrambling process for the filtered signal. On the other hand, the receiver includes: a second processor for performing deinterleaving process and/or descrambling process for a received signal; and an inverse filter for filtering a signal supplied from the second processor.
8 Citations
18 Claims
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1. A communications system comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A transmitter for transmitting signals of at least two channel coded data streams over a common transmission channel, said transmitter comprising:
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means for dividing each data stream into at least two sub-streams (or subcarriers) of a data stream; means for individually preprocessing each of said sub-streams; 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 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. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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Specification