초록 ▼

A transmitter receives information for transmission to a receiver over a communication channel. A cyclical redundancy checking (CRC) code circuit encodes the information with CRC code for error detection purposes. The CRC coded information is provided to a code switch. The code switch provides the C

A transmitter receives information for transmission to a receiver over a communication channel. A cyclical redundancy checking (CRC) code circuit encodes the information with CRC code for error detection purposes. The CRC coded information is provided to a code switch. The code switch provides the CRC coded information to either a first code circuit or a second code circuit for forward error correction (FEC) coding. The first code circuit may, for example, encode the information using a FEC Code 1, such as convolutional coding, and the second code circuit may encode the information using a FEC Code 2, such as repetition coding. The code switch selects either the first or second code circuit based on detected characteristics of the channel. The channel characteristics may be obtained from a channel estimation circuit, may be obtained from an error feedback signal I.sub.3 from the receiver or may be obtained from a combination of both. After the code switch selects the first or second code circuit, the information is appropriately coded to produce a coded signal which is transmitted over the channel by a transmission circuit.

대표청구항 ▼

[ What is claimed is:] [1.] A transmitter for transmitting coded signals over a channel, the channel may have changing characteristics over time, the transmitter comprising:a source interface for receiving information;a code selection circuit for detecting the characteristics of the channel, for sel

[ What is claimed is:] [1.] A transmitter for transmitting coded signals over a channel, the channel may have changing characteristics over time, the transmitter comprising:a source interface for receiving information;a code selection circuit for detecting the characteristics of the channel, for selecting one of a first code and a second code based on the characteristics of the channel and for coding the information in the selected one of the first and second codes to generate coded signals, wherein said first code and said second code are different codes having the same coding rate; anda transmission circuit for transmitting the coded signals over the channel.