Reception method, and a receiver

• US 5,933,423 A
• Filed: 04/19/1996
• Issued: 08/03/1999
• Est. Priority Date: 07/04/1994
• Status: Expired due to Term

• Current Assignee: Nokia Technologies Oy (Nokia Corporation)
• Original Assignee: Nokia Telecommunications Oy (Nokia Corporation)
• Inventors: Lilleberg, Jorma, Hottinen, Ari, Laakso, Timo
• Primary Examiner(s): Patel, Ajit
• Assistant Examiner(s): LEE, CHI HO A
• Application Number:
  US08/602,773
• Time in Patent Office: 1,201 Days
• Field of Search: 370/320, 370/328, 370/335, 370/342, 370/318, 370/331, 370/332, 375/262, 375/208, 375/200, 455/270, 455/561, 455/296, 455/298, 455/343
• US Class Current: 370/335
• CPC Class Codes: H04B 1/7107 Subtractive interference cancellation

Abstract

A reception method and a receiver in a cellular radio system, the receiver comprising means for measuring the power level of each received signal. To detect the received signal in an advantageous manner, the receiver of the invention comprises means for dividing the received signals into several groups having at least two signals each, and means for detecting the signals in each groups from the received transmission simultaneously.

Claims

1. A reception method in a cellular radio system in which the receiver measures a power level of each received signal, where the signal comprises signals from different users, the method comprising:

dividing received signals into several groups comprising at least two signals each, the signals in each group being from different users, and

in each group, simultaneously detecting the signals from the received transmission using simultaneous multi-user detection by taking account correlations with other user signals in the respective group.

2. The method of claim 1 wherein each group is detected in succession, the method further comprising:

regenerating the signals of already detected groups and extracting the signals from the received transmission before the next group is detected.

3. The method of claim 1, wherein the groups are detected in parallel.

4. The method of claim 2, wherein the groups are detected in succession such that the group comprising signals with the highest received power level is detected first.

5. The method of claim 1, wherein the received signals are divided into groups on the basis of the received power level.

6. The method of claim 1, wherein the received signals are divided into groups on the basis of mutual cross-correlation levels such that the signals that interfere with one another the most are placed in the same group.

7. The method of claim 1,wherein the received signals are supplied by a plural number of users.

8. The method of claim 1, wherein the received signals are supplied by one and the same user.

9. The method of claim 1, wherein the cellular radio system employs a CDMA multiple access method.

10. The method of claim 1, wherein the cellular radio system employs a TDMA multiple access method.

12. The receiver of claim 1, further comprising:

means for detecting the groups in succession,

means for regeneration, and

means for extracting the signals of the already detected groups from the received transmission before the next group is detected.

13. The receiver of claim 12, further comprising:

means for detecting the groups in succession such that the group comprising signals with the highest received power level is detected first.

11. A receiver in a cellular radio system comprising:

means for measuring the power level of each signal of a plurality of received signals where the signals comprise signals from different users,

means for dividing received signals into several groups comprising at least two signals each, the signals in each group being from different users, and

means for simultaneously detecting the signals in each group from a received transmission using simultaneous multi-user detection by taking account correlations with other user signals in the respective group.

14. The receiver of claim 11, further comprising means for detecting the groups in parallel.

15. The receiver of claim 11, wherein the cellular radio system employs a CDMA multiple access method, and wherein the means for detecting the groups comprises:

a RAKE receiver and

a plurality of filters matched with the spreading codes of signals to be detected.