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2020年10月6日

CCS - Analog Modulation - Amplitude Modulation (AM) - DSB-AM (Double-SideBand Amplitude Modulation)

摘要： Amplitude Modulation (AM) Amplitude modulation (AM), which is frequently referred to as linear modulation, isthe family of modulation schemes in which 阅读全文

posted @ 2020-10-06 15:37 zzYzz 阅读(573) 评论(0) 推荐(0) 编辑

CCS - Spread Spectrum Communication Systems - Frequency-Hopped Spread Spectrum

摘要： Frequency-Hopped Spread Spectrum In frequency-hopped (FH) spread spectrum the available channel bandwidth W is subdividedinto a large number of nonove 阅读全文

posted @ 2020-10-06 13:53 zzYzz 阅读(218) 评论(0) 推荐(0) 编辑

2020年10月5日

CCS - Spread Spectrum Communication Systems - Generation of PN Sequences

摘要： Generation of PN Sequences A PN sequence is a code sequence of l's and O's whose autocorrelation has properties similar to those of white noise. Refer 阅读全文

posted @ 2020-10-05 23:43 zzYzz 阅读(211) 评论(0) 推荐(0) 编辑

CCS - Spread Spectrum Communication Systems - Direct-Sequence Spread Spectrum Systems - Code Division Multiple Access

摘要： Code Division Multiple Access The enhancement in performance obtained from a DS spread spectrum signal throughthe processing gain and the coding gain 阅读全文

posted @ 2020-10-05 22:34 zzYzz 阅读(278) 评论(0) 推荐(0) 编辑

2020年10月4日

CCS - Spread Spectrum Communication Systems - Direct-Sequence Spread Spectrum Systems

摘要： Direct-Sequence Spread Spectrum Systems Let us consider the transmission of a binary information sequence by means of binaryPSK. The information rate 阅读全文

posted @ 2020-10-04 12:37 zzYzz 阅读(290) 评论(0) 推荐(0) 编辑

2020年10月3日

CCS - Spread Spectrum Communication Systems

摘要： Spread Spectrum Communication Systems Spread spectrum signals for digital communications were originally developed andused for military communications 阅读全文

posted @ 2020-10-03 22:26 zzYzz 阅读(266) 评论(0) 推荐(0) 编辑

CCS - Channel Capacity and Coding - Channel Coding - Decoding LDPC Codes - The Sum-Product Algorithm

摘要： The Sum-Product Algorithm The sum-product algorithm, which belongs to the class of message-passing algorithms,is an iterative decoding algorithm for L 阅读全文

posted @ 2020-10-03 22:14 zzYzz 阅读(443) 评论(0) 推荐(0) 编辑

CCS - Channel Capacity and Coding - Channel Coding - Decoding LDPC Codes - The Bit-Flipping Algorithm

摘要： Decoding LDPC Codes - The Bit-Flipping Algorithm The bit-flipping algorithm is a hard-decision decoding algorithm with low complexity. A modified, and 阅读全文

posted @ 2020-10-03 21:44 zzYzz 阅读(342) 评论(0) 推荐(0) 编辑

CCS - Channel Capacity and Coding - Channel Coding - Low-Density Parity-Check Codes

摘要： Low-Density Parity-Check Codes Low-density parity-check codes (LDPC) are linear block codes that are characterizedby a sparse parity-check matrix. The 阅读全文

posted @ 2020-10-03 16:57 zzYzz 阅读(147) 评论(0) 推荐(0) 编辑

CCS - Channel Capacity and Coding - Channel Coding - Iterative Decoding for Turbo Codes

摘要： Iterative Decoding for Turbo Codes We have seen that optimal decoding of turbo codes is impossible due to the large numberof states in the code trelli 阅读全文

posted @ 2020-10-03 16:36 zzYzz 阅读(136) 评论(0) 推荐(0) 编辑

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