초록 ▼

Radiotelephone communications, such as voice or data, are processed to produce a pilot symbol assisted modulation (PSAM) communications symbol sequence, the PSAM communications symbol sequence including a plurality of predetermined pilot symbols interleaved with a plurality of information symbols re

Radiotelephone communications, such as voice or data, are processed to produce a pilot symbol assisted modulation (PSAM) communications symbol sequence, the PSAM communications symbol sequence including a plurality of predetermined pilot symbols interleaved with a plurality of information symbols representing the radiotelephone communications. The PSAM communications symbol sequence is communicated over a radiotelephone communications channel having a transfer characteristic, producing a sequence of communications symbol data representing the communicated sequence of communication symbols. Pilot symbol data, corresponding to pilot symbols, and information symbol data, corresponding to information symbols, are identified in the sequence of communications symbol data. A data-augmented estimate of the transfer characteristic of the radiotelephone communications channel is generated from the pilot symbol data and the information symbol data. Estimates of information symbols are generated from the corresponding information symbol data and the generated estimate of the transfer characteristic. Radiotelephone communications are decoded from the generated estimates of the information symbols. Preferably, estimates of the transfer characteristic are iteratively generated by identifying a group of information symbol data corresponding to a group of information symbols, generating estimates of the group of identified information symbols from the group of information symbol data and a previously generated estimate of the radiotelephone communications channel transfer characteristic, and generating a new estimate of the transfer characteristic from the pilot symbol data, the information symbol data, and previously generated estimates of information symbols.

대표청구항 ▼

[ That which is claimed:] [1.] A pilot symbol assisted modulation (PSAM) radiotelephone communications method, comprising the steps of:processing radiotelephone communications to produce a PSAM communications symbol sequence, the PSAM communications symbol sequence including a plurality of predeterm

[ That which is claimed:] [1.] A pilot symbol assisted modulation (PSAM) radiotelephone communications method, comprising the steps of:processing radiotelephone communications to produce a PSAM communications symbol sequence, the PSAM communications symbol sequence including a plurality of predetermined pilot symbols interleaved with a plurality of information symbols representing the radiotelephone communications;communicating the PSAM communications symbol sequence over a radiotelephone communications channel having a transfer characteristic to thereby produce a sequence of communications symbol data representing the communicated sequence of communication symbols;identifying pilot symbol data corresponding to pilot symbols and information symbol data corresponding to information symbols, in the sequence of communications symbol data;generating a data-augmented estimate of the transfer characteristic from the pilot symbol data and the information symbol data, including the steps of:generating an estimate of the transfer characteristic from the pilot symbol data;identifying a group of information symbol data corresponding to a group of information symbols;generating estimates of the group of identified information symbols from the group of information symbol data and a previously generated estimate of the transfer characteristic; andgenerating a new estimate of the transfer characteristic from the pilot symbol data, generated estimates of information symbols, and the information symbol data;generating estimates of information symbols from the corresponding information symbol data and a generated estimate of the transfer characteristic; anddecoding radiotelephone communications from the generated estimates of the information symbols.