초록 ▼

A radio receiver receives a plurality of 4-ary FSK signal replicas and detects a four-level detected signal from each 4-FSK signal replica. The four-level detected signal is sampled by an AD converter. When a first signal replica is received before a second signal replica, a first distance between a

A radio receiver receives a plurality of 4-ary FSK signal replicas and detects a four-level detected signal from each 4-FSK signal replica. The four-level detected signal is sampled by an AD converter. When a first signal replica is received before a second signal replica, a first distance between a first sample value and an input center level of the AD converter and a second distance between a second sample value and the input center level are calculated. The first sample value corresponds to the first sample value in the first and second signal replicas, respectively. One of the first sample value and the second sample value is selected depending on which one of the first and second distances is larger than the other.

대표청구항 ▼

[ What is claimed is:] [1.] In a radio receiver for receiving a plurality of signal replicas each being modulated according to a multi-level digital modulating, a diversity combining method comprising the steps of:a) detecting a signal component from each signal replica, the signal component varying

[ What is claimed is:] [1.] In a radio receiver for receiving a plurality of signal replicas each being modulated according to a multi-level digital modulating, a diversity combining method comprising the steps of:a) detecting a signal component from each signal replica, the signal component varying in amplitude;b) sampling the signal component in synchronization with the signal component to produce a sample value;c) determining a first distance between a first sample value and a predetermined level, the first sample value being produced from a first signal replica, and the predetermined level being a center level of a predetermined M-ary range where the first signal component varies in amplitude in accordance with M-ary FSK multilevel digital modulation;d) determining a second distance between a second sample value and the predetermined level, the second sample value being produced from a second signal replica and corresponding to the first sample value; ande) selecting one of the first sample value and the second sample value depending on which one of the first and second distances is larger than the other.