Communication system, transmitter, receiver and multiple access method
AssigneeNEC Corporation
InventorJames Awuor Okello
Life of this patent
Estimating the term…
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.
Claims18
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.
A transmitter for transmitting signals of at least two channel coded data streams over a common transmission channel, said transmitter comprising:
- 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.
Dependencies are inferred from the claim text.