rds_rbds解码器设计及其性能仿真关于rds(radio-data-system)的毕业论文.doc

RDS/RBDS 解码器设计及其性能仿真 I摘摘 要要RDS（Radio Data System）是利用广播调频波段（87.0MHz～108.0MHz） ，将数据加载到每个电台波段的57KHz副载波上，随同音频一起进行广播发射的一种广播数据系统RDS系统规定了若干种信息传播类型，包括基准时间、交通信息、电台台标等早在上世纪90年代初，在欧洲和拉丁美洲就已经出台了RDS系统标准化方案RBDS是美国官方的RDS系统名字，就数据调制解调过程而言，其与欧洲标准RDS没有实质区别看，主要区别是两者解码时所采用的偏置字有所区别在欧洲标准中，一帧数据有四个块，按顺序分别是A、B、C（C’） 、D块在美国标准中，一帧数据除了可能是A、B、C（C’） 、D块外，还可能是4个E块中国采用欧洲RDS标准本文所开发的系统解决方案兼容两种标准，并着重介绍了具体实现的过程本课题主要研究的内容是RDS/RBDS系统的一部分，即解码部分论文首先简单介绍了国内外RDS/RBDS的研究背景，综述了国内外数据广播技术的发展和现状。

接下来，论文重点介绍了RDS/RBDS编码器的设计原理，硬件实现方式；介绍了解码器的设计原理，硬件实现方式；介绍了解码器系统的同步机制，失锁机制；最后仿真了在高斯信道下解码器的工作性能仿真结果表明， （1）在失锁机制关闭的情况下，译码前的仿真误码率与理论误码率完全吻合； Eb/N0大于7dB以后，实际解码性能与采用理想偏置字进行解码的性能相差无几；译码后要达到1e-2的误码性能，其Eb/N0=6.2dB，译码前要达到同等的误码率理论值为7.4dB，由此可知解码与纠错电路能够获得1.2dB的增益 （2）利用偏置字和xor信号两种失锁机制下的每64块错误块的平均误块性能本文给出了译码后希望达到的误码率所需的失锁门限BBL和临界失锁的帧数numFrame译码时，利用偏置字或xor信号来统计每64块中错误块数，当错误块数大于失锁门限时，系统将失锁，重新进入同步搜索本文还给出了两种方案下临界失锁帧数numFrame，通过临界失锁帧数numFrame可以获得信号质量不好时不会发生失锁的最短时间，该最短时间=numFrame*4*26/1187.5 S关键词：RDS/RBDS，广播数据系统，调频，同步，信道编解码RDS/RBDS 解码器设计及其性能仿真 IIABSTRACTRDS (Radio Data System) is applicable for VHF/FM Broadcast in the range from 87.5 MHz to 108.0MHz. It loads data into each radio within 57 KHz band, along with the broadcast audio signal. The RDS system standardizes several types of information transmitted, including time, track/artist info and station identification. RDS has been standard in Europe and Latin America since the early 1990s. RBDS (Radio Broadcast Data System) is the official name used for the U.S. version of RDS. In terms of data demodulation process, with the European standard, RDS has no substantial difference, the main is adopted when the decoding offset words. In European standard, a frame has four blocks, respectively is block A, B, C (C '), D. In American standard, except a frame is block A, B, C (C'), D, also may be four block E. China adopts the European standard of RDS. In this paper the system solutions compat two kinds of standards, and emphatically introduces the concrete implementation process.This topic main research content is one part of RDS/RBDS system, the decoder section. First, backgrounds of research of RDS/RBDS both in and out of the country are presented. Next, the paper mainly introduced the RDS/RBDS encoder, the design principle of hardware implementation; Decoder is introduced, the design principle of hardware implementation; Decoder system synchronization mechanism are introduced, and loss of lock mechanism; finally, simulating the decoder work performance under the gaussian channel. The results show: (1) In the case of closing loss of lock mechanism, to achieve the ber performance of 1 e-2 after decoding is consistent with theoretical error rate completely; After Eb/N0>7dB, the actual decoding performance is almost the same as using ideal bias word decoding performance; to achieve the ber performance of 1 e-2 after decoding, the Eb/N0 = 6.2 dB, to achieve the same ber before decoding, the theoretical value should be 7.4dB, thus the decoding and error correcting circuit obtains a gain of 1.2 dB. (2) The use of bias and xor signal, under the two loss of lock mechanism, the average error blocks performance of per 64 error blocks. The paper gives out the loss of lock threshold of the BBL at expected bit error rate and the critical loss of lock frames after decoding. Using offset word or xor signal to statistic each error blocks per 64, when the error blocks is greater than the loss of lock threshold, the system will be loss of lock, the decoder comes back to search synchronization. This paper also gives a critical loss of lock frames numFrame under two kinds of schemes, it doesn't happen in the shortest time through the critical loss of lock frames numFrame until the decoder is loss of lock when the signal is bad , the shortest time = numFrame*4*26/1187.5 S.Key words: RDS/RBDS, Radio Data System, FM, Synchronization, Channel codecRDS/RBDS 解码器设计及其性能仿真 III目 录1 绪论..........................................................................................................................................................11.1 RDS/RBDS 综述...........................................................................................................................1 1.2 无线广播数据系统起源............................................................................................................1 1.3 无线广播数据系统现状............................................................................................................2 1.4 RDS/RBDS 系统框图...................................................................................................................42 RDS decoder 系统设计.................................................................................................................62.1 RDS decoder 系统组成...........................................................。