CCS - 随笔分类 - zzYzz

CCS - Analog-to-Digital Conversion - Quantization - Vector Quantization

摘要：Vector Quantization In scalar quantization each output of the discrete-time source is quantized separatelyand then encoded. For example, if we are usi 阅读全文

posted @ 2020-10-22 20:57 zzYzz 阅读(153) 评论(0) 推荐(0)

CCS - Analog-to-Digital Conversion - Quantization - Scalar Quantization

摘要：Quantization In the previous section we studied two methods for noiseless coding; that is, compressionof the source output sequence such that full rec 阅读全文

posted @ 2020-10-21 21:54 zzYzz 阅读(156) 评论(0) 推荐(0)

CCS - Analog-to-Digital Conversion - Measure of Information - Noiseless Coding - Huffman Coding

摘要：Measure of Information Noiseless Coding Noiseless coding is the general term for all schemes that reduce the number of bits requiredfor the representa 阅读全文

posted @ 2020-10-18 15:46 zzYzz 阅读(118) 评论(0) 推荐(0)

CCS - Analog-to-Digital Conversion

摘要：Analog-to-Digital Conversion The majority of information sources are analog by nature. Analog sources includespeech, image, and many telemetry sources 阅读全文

posted @ 2020-10-17 17:17 zzYzz 阅读(161) 评论(0) 推荐(0)

CCS - Analog Modulation - Angle Modulation

摘要：Angle Modulation Angle-modulation schemes, which include frequency modulation (FM) and phase modulation(PM), belong to the class of nonlinear modulati 阅读全文

posted @ 2020-10-17 17:08 zzYzz 阅读(285) 评论(0) 推荐(0)

CCS - Analog Modulation - Amplitude Modulation (AM) - Demodulation of AM Signals - Conventional AM Demodulation

摘要：Conventional AM Demodulation The conventional AM is inferior to DSB-AM and SSB-AM whenpower and SNR are considered. The reason is that a usually large 阅读全文

posted @ 2020-10-14 21:35 zzYzz 阅读(422) 评论(0) 推荐(0)

CCS - Analog Modulation - Amplitude Modulation (AM) - Demodulation of AM Signals - Conventional AM Demodulation

摘要：Conventional AM Demodulation The conventional AM is inferior to DSB-AM and SSB-AM whenpower and SNR are considered. The reason is that a usually large 阅读全文

posted @ 2020-10-14 21:29 zzYzz 阅读(324) 评论(0) 推荐(0)

CCS - Analog Modulation - Amplitude Modulation (AM) - Demodulation of AM Signals - SSB-AM Demodulation

摘要：Demodulation of AM Signals Demodulation is the process of extracting the message signal from the modulated signal.The demodulation process depends on 阅读全文

posted @ 2020-10-11 21:40 zzYzz 阅读(328) 评论(0) 推荐(0)

CCS - Analog Modulation - Amplitude Modulation (AM) - Demodulation of AM Signals - DSB-AM Demodulation

摘要：Demodulation of AM Signals Demodulation is the process of extracting the message signal from the modulated signal.The demodulation process depends on 阅读全文

posted @ 2020-10-07 22:06 zzYzz 阅读(626) 评论(0) 推荐(0)

CCS - Analog Modulation - Amplitude Modulation (AM) - SSB-AM (Single-SideBand Amplitude Modulation)

摘要：SSB-AM SSB-AM is derived from DSB-AM by eliminating one of the sidebands. Therefore,it occupies half the bandwidth of DSB-AM. Depending on the sideban 阅读全文

posted @ 2020-10-06 19:59 zzYzz 阅读(386) 评论(0) 推荐(0)

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(687) 评论(0) 推荐(0)

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(265) 评论(0) 推荐(0)

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(230) 评论(0) 推荐(0)

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(312) 评论(0) 推荐(0)

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(320) 评论(0) 推荐(0)

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(285) 评论(0) 推荐(0)

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(524) 评论(0) 推荐(0)

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(371) 评论(0) 推荐(0)

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(184) 评论(0) 推荐(0)

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(149) 评论(0) 推荐(0)

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