Rate detection in radio communication systems

Details Rate detection in radio communication systems Rate detection in radio communication systems

2005-07-12

2005-07-12

Pham, Chi (Department: 2666)

Multiplex communications

Communication techniques for information carried in plural...

Combining or distributing information via time channels

C370S280000, C370S336000, C340S426110, C375S225000, C375S140000, C380S044000

Reexamination Certificate

active

06917629

ABSTRACT:
An improved system and method for rate detection of transmitted signals is disclosed for use in a IS-95 CDMA downlink. For each speech frame, one of four possible bit rates is used to encode the frame according to the standard. The present invention describes a receiver and various processes that are able to detect which rate was sent without the aid of flag bits or other mode indication information. According to various embodiments of the invention different rate detection processes which can exploit additional code information, such as CRC checks and convolutional coding, are disclosed.

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