초록 ▼

Several methods and corresponding apparatus to reduce multiple access interference in code division multiple access communications systems through successive interference cancellation techniques. An estimate of reliability of cancellation of a strongest interfering signal is formed from analysis of

Several methods and corresponding apparatus to reduce multiple access interference in code division multiple access communications systems through successive interference cancellation techniques. An estimate of reliability of cancellation of a strongest interfering signal is formed from analysis of a pilot signal associated with the strongest signal. The estimate is used to derive a weight that is multiplied by a replica of the strongest signal to provide a weighted replica. The weighted replica is subtracted from a delayed version of the received channel. As a result, interference cancellation is robustly implemented when the strongest signal replica is most likely to be accurate and is not robustly implemented when the strongest signal replica is not likely to be accurate. This avoids combining a replica of the strongest signal with the received channel when the replica is more likely to contribute additional interference rather than reduce it.

대표청구항 ▼

1. In a communication system having a base station and a plurality of user stations that exchange communication signals between the base station and each of the plurality of users, a method for reducing multiple access interference between transmitted communication signals, the method comprising:rec

1. In a communication system having a base station and a plurality of user stations that exchange communication signals between the base station and each of the plurality of users, a method for reducing multiple access interference between transmitted communication signals, the method comprising:receiving a plurality of code division multiple access signals; finding a first signal of the plurality of code division multiple access signals that has a greatest amplitude: receiving a first pilot signal associated with the first signal; determining parameters from the first pilot signal; decoding first data from the first signal; constructing a first replica of the first signal from the first data; combining the first replica with parameters derived from the first pilot signal to provide a first subtractive signal; and subtracting the first subtractive signal from the plurality of code division multiple access signals to provide a first reduced plurality of code division multiple access signals.