No self-introduction
Loading
Profile
Follow
codes (9)
Huffman coding
no vote
Huffman coding, Huffman coding), also known as Huffman coding, is a way of coding, Huffman coding is a kind of variable length coding (VLC). Huffman in 1952 proposed a coding method, this method completely in accordance with the character probability to construct different prefix of the average length of the shortest codeword, sometimes referred to as the best coding, generally called Huffman coding (sometimes referred to as Huffman coding).
瓦蓝瓦蓝 0 0
1
Ruili and rice fading channels-channel distributio
no vote
(Rayleigh fading channel) is a statistical model of the radio signal propagation environments. This model assumes that after signals over wireless channels, the signal amplitude is random, or "decline", and the envelope is Rayleigh distributed. This channel model can be described by ionospheric and tropospheric reflective HF channel, as well as built-up urban environments. Rayleigh fading is only suitable for direct signal from the transmitter to the receiver does not exist (LoS,Line of Sight), you should use the rician fading channel model.
瓦蓝瓦蓝 3 0
1
Using MATLAB to realize m series, with its associa
no vote
M sequence is currently widely used a pseudo random sequence and its in the field of communication has a widely used, such as the spread spectrum communication, CDMA satellite communication, and digital data encryption, scrambling, synchronization, error rate measurement field.
瓦蓝瓦蓝 2 0
1
Using m to achieve MATLAB sequences, and related
no vote
M series is widely used a pseudo-random sequence, which is widely applied in the field of communication, such as spread-spectrum communications, satellite communications, code-division multiple-access, digital data encryption, scrambling, synchronous, bit error rate measurement fields.
All pseudo-random sequence, the m series is the most important and most fundamental kind pseudo random sequence. It is easy to produce, regularity, better have good autocorrelation and cross correlation. IS-95 reverse channel, select m series PN codes as codes with different phase m almost orthogonal sequence of attributes for each user's business channel is assigned a phase.
瓦蓝瓦蓝 0 0
1
Orthogonal frequency division multiplexing OFDM
no vote
OFDM technology was developed by MCM (Multi-Carrier Modulation, multi-carrier modulation) evolved. OFDM technology is one of Multicarrier transmission scheme of its modulation and demodulation is realized based on FFT and IFFT, is to achieve the lowest complexity, the most widely used kind of Multicarrier transmission scheme. In communications systems, available in the channel bandwidth is usually wider than the bandwidth required to transmit signals all the way to much. If a channel transmit signal is very wasteful, in order to make full use of channel bandwidth, frequency division multiplexing method can be used.
瓦蓝瓦蓝 0 0
1
Communications Engineering Simulation Tutorial
no vote
Communications engineering majors to study the signal generation, transmission, Exchange and processing of information, and computer communications, digital communications, satellite communications, optical communications, cellular communications, personal communications, stratospheric communication, multimedia, information highway, digital program-controlled exchange of theoretical and practical problems. As the 19th century Americans from the date of the invention of the Telegraph, modern communications technology has been developed. In order to meet the ever-growing technology needs communication engineering became the United States of university education in a discipline, and was developed rapidly as modern technology improves.
瓦蓝瓦蓝 0 0
1
MATLAB implementation contains encoding and decodi
4.3
LDPC codes namely low density parity check codes (Low Density Parity Check Code,LDPC), it proposed in 1963 by Dr Robert G.Gallager of a class of sparse parity-check matrix of a linear block code, not only a good approximation of the Shannon limit performance, and at lower decoding complexity, flexible structure that is focus of channel coding field in recent years, has been widely used for deep space communications, optical communications, Satellite digital audio and video broadcasting and other fields. LDPC codes has become the fourth generation of communication systems (4G) strong competitor, and coding schemes based on LDPC codes has been adopted next generation satellite digital video broadcast standard DVB-S2.
瓦蓝瓦蓝 3 0
1
111 classic instances of Verilog
no vote
Verilog HDL is a kind of hardware description language, which is used to model digital system at various abstract design levels from algorithm level, structure level, gate level to switch level. The complexity of digital system object to be modeled can be between switch level circuit (such as PMOS / NMOS), simple gate (such as library unit description) and complete complex electronic digital system (such as CPU)
瓦蓝瓦蓝 0 0
1
C++ minimum path
no vote
The shortest path problem is a classical algorithm problem in graph theory, which aims to find the shortest path between two nodes in a graph. The specific form of the algorithm includes: the shortest path problem to determine the starting point - that is, the problem of finding the shortest path when the starting node is known. The shortest path problem to determine the end point - contrary to the problem to determine the starting point, the problem is to find the shortest path when the end point is known. In undirected graph, the problem is equivalent to the problem of determining the starting point. In directed graph, the problem is equivalent to the problem of determining the starting point by reversing the direction of all paths. The problem of determining the shortest path between the starting point and the end point is to find the shortest path between two nodes when the starting point and the end point are known. Global shortest path problem - finding all shortest paths in a graph.
瓦蓝瓦蓝 0 0
1
No more~
Follows0
Fans0