Receiver decoder circuitry, and associated method, for decoding an encoded signal
AssigneeEricsson Inc.
InventorAli S. Khayrallah
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Abstract
Decoder circuitry, and an associated method, decodes an encoded signal received at a receiver. A determination is made of the levels of distortion introduced upon a signal during its transmission to a receiver upon a nonideal communication channel. If the communication channel introduces moderate amounts of distortion upon the signal, a complex decoding technique such as a standard trellis decoding technique is utilized to decode the signal. If the channel is determined to introduce only small levels of distortion upon the signal, a relatively simple, decoding technique is instead utilized.
Claims22
In a receiver which receives a channel-encoded receive signal transmitted upon a communication channel, channel decoder circuitry for decoding the channel-encoded receive signal, said decoder circuitry comprising:
- a first decoder coupled to receive a first signal representative of the channel-encoded receive signal, said first decoder for forming an indication of levels of distortion introduced upon the channel-encoded receive signal during transmission thereof upon the communication channel and for decoding the first signal representative of the channel-encoded receive signal according to a first decoding technique;
- and
- a second decoder coupled to receive a second signal representative of the channel-encoded receive signal, said second decoder for decoding the second signal according to a second decoding technique, said second decoder operable when the indication formed by said first decoder of the levels of distortion are within selected amounts.
A method for decoding a channel-encoded receive signal transmitted upon a communication channel, said method comprising the steps of:
- receiving the channel-encoded receiver signal;
- determining levels of distortion introduced upon the channel-encoded receive signal during transmission thereof upon the communication channel;
- decoding the channel-encoded receive signal using a first decoding technique;
- detecting when the levels of the distortion of the channel-encoded receive signal are within a selected range;
- and
- decoding the channel-encoded receive signal according to a second decoding technique when the levels of the distortion of the channel-encoded receive signal are within the selected range.
Decoder circuitry, comprising:
- a syndrome former coupled to a received channel encoded receive signal for generating a distortion signal indicating a distortion level of the received channel encoded receive signal;
- a first decoder for decoding the received channel encoded receive signal according to a first decoding technique to generate a first decoded signal;
- a second decoder for decoding the received channel encoded receive signal according to a second decoding technique to generate a second decoded signal;
- a decision device for enabling the second decoder in response to an indication by the distortion signal of a predetermined distortion level;
- and
- a selector for selecting the second decoding signal when the second decoder is enabled.
Dependencies are inferred from the claim text.