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DS-CDMA-multiple-user-serial-interference-canceler-unit-and-method-of-transmitting-interference-replica-signal-of-the-same

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DS-CDMA multiple user serial interference canceler unit and method of transmitting interference replica signal of the same

Details

Inventors: Suzuki, Hideto;
Assignee: NEC Corporation (JP)
Primary Examiner: Pham; Chi H.
Assistant Examiner: Bayard; Emmanuel
Attorney, Agent or Firm: Ostrolenk, Faber, Gerb & Soffen, LLP

A sum of interference replica signals of other user that have been generated and synthesized is transmitted to each user at each stage. An interference replica signal of a present user generated at a stage previous to a present stage is subtracted from the synthesized replica signal. The remained interference replica signal is subtracted from the received signal, thus cancelling the interference generated by other user.

DETAILED DESCRIPTION An objective of the present invention is to provide a method of transmitting an interference replica signal of a DS-CDMA multiple user serial interference canceler in which the transmission rate at which the interference replica signal of other user is transmitted to each user is decreased so as to facilitate system construction.
Another objective of the present invention is to provide a DS-CDMA multiple user serial interference canceler in which the size of the received signal memory is kept compact in the latter phase of processing, allowing for easy system construction.
The above objective of the present invention is achieved by a method of transmitting an interference replica signal of a DS-CDMA multiple user serial interference canceler unit comprising 1st to Nth stages (N: natural number .
gtoreq.
2) each provided with K interference cancel units (K: natural number .
gtoreq.
1), in which a sum of synthesized interference replica signals of a user that have been previously generated is transmitted to each user at each stage; an interference replica signal of a present user generated at a stage previous to a present stage is subtracted from the synthesized interference replica signal; and a remained interference replica signal is subtracted from a received signal so that an interference component generated by other user is removed(cancelled) and input to an interference cancel unit of a present user.
The another objective of the present invention is achieved by a method of transmitting an interference replica signal of a DS-CDMA multiple user serial interference canceler unit provided with 1st to Nth stages (N: natural number .
gtoreq.
2) each provided with K units (K natural number .
gtoreq.
1) of interference replica signal generation means for generating an interference replica signal based on a received signal at each stage comprising steps of: transmitting a signal S' obtained by subtracting a sum of interference replica signals at nth stage from a recption signal to (n+1)th stage from a kth user at the nth (1

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