Method and apparatus for determining the rate of received data i

Details Method and apparatus for determining the rate of received data i Method and apparatus for determining the rate of received data i

1996-10-18

1998-05-12

Canney, Vincent P.

Excavating

371 381, G06F 1100

Patent

active

057517258

ABSTRACT:
The apparatus and method are employed in a communications system has a transmitter and a receiver, where the receiver determines at which of several rates individual frames in a signal have been transmitted by the transmitter. For example, if the transmitter employs four transmission rates, the receiver decodes each frame of the received signal based on the four rates to produce four cyclic redundancy check (CRC) bits, four symbol error rate (SER) values and one or more Yamamoto check values. If only two of the CRC bits check, then the receiver compares to each other the SER values for those two rates to determine at which of the two rates a current frame was transmitted. If only one of the CRC bits check for a given rate, then the SER value for that rate is compared with a maximum SER threshold for that rate. Additionally, SER values for the other rates can be compared to minimum SER thresholds. Furthermore, the Yamamoto check values can be analyzed to determined whether looser or tighter minimum and maximum SER thresholds should be employed if the Yamamoto values check for the current rate, or do not check, respectively.

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W. C. Wong et al., "Combined Source and Channel Coding of Subband Coded Speech with Post-Enhancement", Communication Systems: Toward Global Integration, vol. 2, Nov. 1990, pp. 886-890.
N. Seshadri et al., "Generalized Viterbi Algorithms for Error Detection with Convolutional Codes", IEEE, 1989, pp. 1534-1538.

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