초록 ▼

A system for determining the rate at which data has been encoded in the receiver of a variable-rate communications system. The data is received in frames having a fixed number of symbols. Multiple copies of symbols fill the frame when data is encoded at less than the full rate. At an encoding rate o

A system for determining the rate at which data has been encoded in the receiver of a variable-rate communications system. The data is received in frames having a fixed number of symbols. Multiple copies of symbols fill the frame when data is encoded at less than the full rate. At an encoding rate of one fourth the full rate, for example, each symbol in the frame is repeated four times. The incoming symbols are provided to multiple paths for decoding. Each path decodes the symbols at one of the possible rates. Error metrics, which describe the quality of the decoded symbols, are extracted and provided to a processor. The error metrics may include Cyclic Redundancy Check (CRC) results, Yamamoto Quality Metrics, and Symbol Error Rates. The processor analyzes the error metrics and determines the most probable rate at which the incoming symbols were encoded.

대표청구항 ▼

[ We claim:] [1.] In a receiver of a variable-rate communication system, a method for determining a data rate of a received signal comprising the steps of:decoding and re-encoding at a first data rate said received signal to produce a first received signal prediction and to produce a first quality i

[ We claim:] [1.] In a receiver of a variable-rate communication system, a method for determining a data rate of a received signal comprising the steps of:decoding and re-encoding at a first data rate said received signal to produce a first received signal prediction and to produce a first quality indication;comparing said first received signal prediction to said received signal and counting a first number of errors, wherein an error occurs when said received signal does not match said first received signal prediction, and wherein said first number of errors and said first quality indication define a first error metric;reducing said received signal to produce a second received signal representing a second data rate;decoding and re-encoding at said second data rate said second received signal to produce a second received signal prediction and to produce a second quality indication;comparing said second received signal prediction to said second received signal and counting a second number of errors, wherein an error occurs when said second received signal does not match said second received signal prediction, and wherein said second number of errors and said second quality indication define a second error metric; andpredicting said data rate of said received signal based on a comparison of each of said error metrics.