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Parallel encoder of multi-code rate reed-solomon (RS) codes in china mobile multimedia broadcasting (CMMB) and encoding method

An encoder and code rate technology, which is applied in the field of parallel coding of multi-code rate RS codes, can solve the problem of high implementation complexity of CMMB multi-code rate RS coding, and achieve the effect of reducing demand and simplifying control logic.

Inactive Publication Date: 2013-01-02
COMMUNICATION UNIVERSITY OF CHINA
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Problems solved by technology

[0006] Aiming at the technical disadvantage of high implementation complexity in existing solutions for CMMB multi-rate RS encoding, the present invention provides a variable-rate efficient parallel encoding method, using a single encoder to process multi-rate RS codes , Simplify the control logic, and use the multi-input XOR gate multiplexing mechanism to effectively reduce the demand for registers and logic resources

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  • Parallel encoder of multi-code rate reed-solomon (RS) codes in china mobile multimedia broadcasting (CMMB) and encoding method
  • Parallel encoder of multi-code rate reed-solomon (RS) codes in china mobile multimedia broadcasting (CMMB) and encoding method
  • Parallel encoder of multi-code rate reed-solomon (RS) codes in china mobile multimedia broadcasting (CMMB) and encoding method

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Embodiment Construction

[0021] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments, but not as a limitation of the present invention.

[0022] The baseband processing of the CMMB transmitter involves the coding of 3 bit rate RS codes, such as figure 1 shown. if used figure 2 The traditional parallel RS encoder shown in the figure respectively realizes the RS coding of three code rates, then the multiplier constant g k，d (k=176, 192 or 224, 0≤d image 3 shown.

[0023] Figure 4 A schematic structure diagram of a parallel RS encoder with a variable code rate is given, which is mainly composed of four functional modules: a shift register, an 8-bit two-input XOR gate, a summation array and a product selector.

[0024] The shift register consists of 64 8-bit registers R 0 , R 1 ,...,R 63 It is formed by cascading, and 63 8-bit two-input XOR gates are inserted between adjacent registers.

[0025] The summation array traverses...

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Abstract

The invention relates to a scheme for solving a problem of parallel encoding of three kinds of reed-solomon (RS) codes in a china mobile multimedia broadcasting (CMMB) system and is characterized in that a parallel encoder of the multi-code rate RS codes of the system is manly composed of four parts including a shifting register, an eight-bit dual-input exclusive-or-gate, a summation array and product selectors. All finite field multiplying units share one 255 multiple-input exclusive-or-gate in the summation array. Each product selector selects eight outputs of the multiple-input exclusive-or-gate to form a result of the finite field multiplying units, and all product selectors completes parallel computation of the 64 finite field multiplying units simultaneously. A single encoder is compatible to three kinds of code rate, is simple in control logic, can greatly reduce resource needs on the premise of keeping encoding speed to be unchanged, and has the advantages of being low in cost, small in power dissipation and the like.

Description

technical field [0001] The invention relates to the field of mobile multimedia broadcasting, in particular to a parallel encoding method of multi-code rate RS codes in a CMMB system. Background technique [0002] In digital communication systems, in order to improve the reliability of data during channel transmission, forward error correction technology is often used to resist the influence of noise and interference, reduce the bit error rate, and improve the quality of reception. Reed-Solomon (Reed-Solomon, RS) code has a strong ability to correct random and burst errors, and has been widely used in modern communication systems. [0003] The CMMB system adopts concatenated codes, the inner code is LDPC code, and the outer code is finite field GF(2 8 ) on (240,k) systematically shortened RS codes. The RS code length is always n=240 bytes, and there are 4 code rates. It should be pointed out that the (240, 240) RS code does not need to be encoded, and actually only needs t...

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Application Information

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IPC IPC(8): H03M13/15
Inventor 蔡超时张鹏杨刚
Owner COMMUNICATION UNIVERSITY OF CHINA
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