MODULATION, DETECTION AND CODING docx

... +1 and +1 x +1 = +1, the spreading code completely vanishes and the message signal resumes its original shape and bandwidth. The bandwidth of interfering signals, on the other hand, ... to the bandwidth expansion and is called processing gain; e.g. a bandwidth expansion of 100 times gives a proces- sing gain of 20 dB. The combination of multiplier and bandp...

Ngày tải lên: 28/06/2014, 21:20

... to error detection and correction. indirectly, to error detection and correction. Types of Errors Redundancy Detection Versus Correction Forward Error Correction Versus Retransmission Coding Modular ... section: 10.15 The 4B/5B block coding discussed in Chapter 4 is a good example of this type of coding. In this coding scheme, k = 4 and n = 5. As we saw, we have 2 k = 16...

Ngày tải lên: 16/02/2014, 20:20

... the last and first syllables in the reparandum and repair, respectively, and for normalized f0 and energy; results did not substantially differ from those presented here. port Levelt and Cutler's ... represented and lexical and syntactic category assign- ments hand-corrected, indicating that, in theory, the edit signal can be computationally exploited for both repai...

Ngày tải lên: 20/02/2014, 21:20

... by Enterprise Ireland and by Science Foundation Ireland under Grant no. 03/IN.3/I361. REFERENCES [1] “The Internet movie database,” http://www.imdb.com/, September 2006. [2] M. Yeung and B L. Yeo, ... 771–785, 1997. [4] Z. Rasheed and M. Shah, “Scene detection in Hollywood movies and TV shows,” in Proceedings of the IEEE Computer Society Conference on Computer Vision and Pattern R...

Ngày tải lên: 22/06/2014, 19:20

... modulation and coding, Branch and bound algorithm, IEEE 802.16e, Resource allocation, Scal- able video coding 1 Introduction With the popularity of wireless networks, the need for net- work bandwidth ... fruitless candidates, a branch and bound method which is based on two dominance rules and a lower bound is presented to solve the TUMP. The simulation results show that the propose...

Ngày tải lên: 21/06/2014, 02:20

... independently coded and modulated data streams are transmitted. 2.1. Transmitter At first, random data bits are generated and then coded by a concatenated Reed-Solomon (RS) and convolutional encoder ... alphabet. The coding, interleaving, and symbol mapping are the same as defined in the WiMAX IEEE 802.16-2004 specification [5]. Depending on the feedback information from the receiver, t...

Ngày tải lên: 22/06/2014, 06:20

... bandwidth constraint  Nyquist bandwidth constraint:  The theoretical minimum required system bandwidth to detect Rs [symbols/s] without ISI is Rs/2 [Hz].  Equivalently, a system with bandwidth ... filter Equalizing filter Threshold comparison For bandpass signals Compensation for channel induced ISI Baseband pulse (possibly distored) Sample (test statistic) Baseband pulse Received wav...

Ngày tải lên: 18/10/2013, 06:15

... ,zzZ ZZZZ = =Z Channel Lecture 10 2 Last time, we talked about:  Channel coding  Linear block codes  The error detection and correction capability  Encoding and decoding  Hamming codes  Cyclic codes Lecture 10 ... bits Lecture 10 10 Effective code rate  Initialize the memory before encoding the first bit (all- zero)  Clear out the memory after encoding the last bit (all- zero)...

Ngày tải lên: 25/10/2013, 06:15

... error correction coding?  Error performance vs. bandwidth  Power vs. bandwidth  Data rate vs. bandwidth  Capacity vs. bandwidth (dB) / 0 NE b B P A F B D C E Uncoded Coded Coding gain: For ... received polynomial by the generator polynomial.  With syndrome and Standard array, error is estimated.  In Cyclic codes, the size of standard array is considerably reduced. )()()( XXX...

Ngày tải lên: 25/10/2013, 06:15

... code uses two levels on coding, an inner code and an outer code (higher rate).  Popular concatenated codes: Convolutional codes with Viterbi decoding as the inner code and Reed-Solomon codes ... each state, and keeps only the path with the largest metric, called the survivor, together with its metric. Lecture 12 6 Soft and hard decision decoding …  ML soft-decisions decoding ru...

Ngày tải lên: 29/10/2013, 13:15