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Correction circuit for improving performance in a channel decoder

A technology for correcting circuits and decoders, applied in other decoding technologies, electrical components, baseband systems, etc., and can solve complex problems

Inactive Publication Date: 2012-05-30
RES IN MOTION LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this equalizer is much more complex than traditional equalizers

Method used

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  • Correction circuit for improving performance in a channel decoder
  • Correction circuit for improving performance in a channel decoder
  • Correction circuit for improving performance in a channel decoder

Examples

Experimental program
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Embodiment Construction

[0018] refer to figure 1 , provides a block diagram of a GSM mobile data communication system 10 according to one embodiment. The mobile data communication system 10 may operate according to the GSM or EDGE communication standards.

[0019] As shown, speech and / or data go through encoder 12 (i.e., parity and convolutional encoding), interleaving module 14, burst signal format module 16 and MSK (minimum shift keying) mapping module 18. The encoded information is received and passed through a filter and RF receiver / demodulator 21 . Then, channel equalization is performed on a burst-by-burst basis using the Viterbi equalizer 22 . The transmitted data burst then passes through correction circuit 24, demapping module 26, burst removal module 28, deinterleaving module 30 and decoding module 32 before being transmitted to the user as voice and / or data.

[0020] also refer to figure 2 , the correction circuit 24 estimates a correction factor in the correction factor estimation m...

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PUM

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Abstract

A receiver for a mobile communication system includes a channel equalizer for receiving a burst and generating a soft decision output associated with the burst, a soft decision correction circuit following the channel equalizer and a decoder for receiving and decoding a block of bursts. The soft decision correction circuit calculates a correction factor based on the soft decision output for the burst and applies the correction factor to the burst prior to the burst entering the decoder.

Description

technical field [0001] The present invention relates to a mobile communication system, and more particularly to a correction circuit for improving the performance of a channel decoder in a receiver. Background technique [0002] GSM (Global System for Mobile Communications) is the dominant world standard for 2G / 2.5G wireless voice and data communications. EDGE (Enhanced Data Rates for GSM Evolution) is a 3G technology that provides increased data transfer speeds of up to 384 kbit / s within the existing GSM spectrum. EDGE, an enhancement to GPRS (General Packet Radio Service), is becoming more widely used because it effectively triples the total data rate offered by GSM. [0003] In wireless telephony and data terminal products, the main cause of performance degradation is ambient noise. Reducing or eliminating noise is a challenge because ambient noise tends to vary significantly in different environments. [0004] In a typical GSM communication system, voice and / or data a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03M13/45H04L1/00H04L1/22
CPCH04L25/03178H04L27/22
Inventor 西恩·塞门斯吴欢佐尔坦·克门兹
Owner RES IN MOTION LTD
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