Adaptive hybrid ARQ coding schemes for slow fading channels in m

Details Adaptive hybrid ARQ coding schemes for slow fading channels in m Adaptive hybrid ARQ coding schemes for slow fading channels in m

1996-03-20

1998-10-27

Baker, Stephen M.

Excavating

371 55, 371 35, H03M 1300, H04L 116

Patent

active

058286772

ABSTRACT:
A method and apparatus for performing adaptive hybrid automatic repeat request (ARQ) coding in which the coding is modified based on the acknowledgements returned by the receiver. In accordance with one illustrative embodiment of the present invention, the state of the channel is implicitly determined by the transmitter based upon the frequency of acknowledgments (ACKs and NACKs) arriving from the receiver. For example, since a NACK implies a weak received signal strength, the code rate of the FEC is advantageously reduced in response to such an acknowledgement. On the other hand, the code rate of the FEC is advantageously increased in response to an ACK. In accordance with another illustrative embodiment of the present invention, the acknowledgement returned by the receiver is modified to convey the number of errors in the corresponding received data packet. In particular, a Reed-Solomon (RS) outer code is employed in the FEC to enable the receiver to determine the number of errors in the received data packet. If the acknowledgement indicates a large number of errors at the receiver, the code rate of the FEC is advantageously reduced in response thereto.

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