Title:
【発明の名称】受信信号のデータレートを決定する方法及び装置
Document Type and Number:
Japanese Patent JP3067804
Kind Code:
B2
Abstract:
A system for determining the rate at which data has been encoded in the receiver (12) of a variable-rate communications system. The data is received in symbols that are grouped in frames. When data is transmitted at full rate, the frame is filled with symbols. When the data is transmitted at less than full rate, symbols are repeated within a frame until the frame is full or the symbols are spaced apart within a frame. At an encoding rate of one fourth the full rate, for example, each symbol in the frame is repeated four times or data is transmitted one quarter of the time. The incoming frames are decoded, for example by decoder (48), and re-encoded, for example by encoder (76), at each possible data rate. A comparator, for example comparator (84), compares the re-encoded symbols with the originally received symbols and a counter, for example counter (100), counts the number of symbol errors. Each decoding process produces an indication of the quality of the decoding process which may include Cyclic Redundancy Check (CRC) results, for example CRC (120), or Yamamoto Quality Metrics. The counted errors and the quality indication comprise an error metric which is passed to a processor, for example microprocessor (56). The processor analyzes the error metric for each data rate and determines the most probable rate at which the incoming symbols were encoded.
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Inventors:
Butler, Brian Kay
Padbani, Roberto
Zehavi, Eframe
Padbani, Roberto
Zehavi, Eframe
Application Number:
JP50302095A
Publication Date:
July 24, 2000
Filing Date:
June 20, 1994
Export Citation:
Assignee:
Qualcomm Incorporated
International Classes:
H04L1/00; H04L1/08; H04L25/02; H04L29/08; H04B1/707; (IPC1-7): H04L1/00; H04L29/08; H04J13/00
Domestic Patent References:
| JP1181251A | ||||
| JP5746557A | ||||
| JP5758447A | ||||
| JP4195870A |
Attorney, Agent or Firm:
Takehiko Suzue (3 outside)