This program simulates the bit-error-rate (BER) performance of OSTBC with L=4 antennas over the frequency flat Rayleigh block fading channel The code is developed for real orthogonal design, code rate 1/2 modulation- 16 QAM with gray coding resulting in 2 bits/sec/Hz.
標(biāo)簽： bit-error-rate performance simulates the
上傳時(shí)間： 2014-01-13
上傳用戶：whenfly
This project aim was to build wireless software modem for data communication between two computers using an acoustic interface in the voice frequency range (20Hz– 20,000Hz). The transmitting antenna is a speaker (frequency response of: 90Hz – 20,000Hz) and the receiving antenna is a microphone (frequency response of: 100Hz – 16,000Hz). The test files used as information files were text files. This goal was attained both in an incoherent scheme and in a coherent scheme. Build under Matlab code, our modem uses OFDM (orthogonal frequency division multiplexing) modulation, synchronization by LMS sequence, channel estimation (no equalizer) via pilot tones. The symbols are either PSK or ASK for a constellation size of 2 or 4. To optimize the probability of error, these symbols were mapped using Gray mapping. Report
標(biāo)簽： communication computers software wireless
上傳時(shí)間： 2014-05-29
上傳用戶：wangdean1101
OFDM Modem Applications • Digital Video Broadcast (DVB) • Digital Audio Broadcast (DAB) • Broadband Wireless Access (802.16x) • Wireless LAN (802.11x & HiperLAN) Orthogonal OFDM Sub-carriers Orthogonal Frequency Division Multiplexing (OFDM)
標(biāo)簽： Broadcast Digital 8226 Applications
上傳時(shí)間： 2016-03-23
上傳用戶：cc1
A digital fi‘equeney meter designed with FPGA development software Q-~us 11 is introduced．The 1 Hz—l MHz input measured pulse signals of the digital ii‘equency meter can be used for measuring frequency，period，pulse width and duty ratio，etc．The test results stably display O71 3 seven—segment numeric tubes，and the measuring ranges may be switched over automatically．The measuring error is equal to or less than 0．1％．
標(biāo)簽： development introduced designed software
上傳時(shí)間： 2016-04-09
上傳用戶：stewart·
DFT(Discrete Fourier Transformation)是數(shù)字信號(hào)分析與處理如圖形、語(yǔ)音及圖像等領(lǐng)域的重要變換工具，直接計(jì)算DFT的計(jì)算量與變換區(qū)間長(zhǎng)度N的平方成正比。當(dāng)N較大時(shí)，因計(jì)算量太大，直接用DFT算法進(jìn)行譜分析和信號(hào)的實(shí)時(shí)處理是不切實(shí)際的。快速傅立葉變換(Fast Fourier Transformation，簡(jiǎn)稱FFT)使DFT運(yùn)算效率提高1～2個(gè)數(shù)量級(jí)。其原因是當(dāng)N較大時(shí)，對(duì)DFT進(jìn)行了基4和基2分解運(yùn)算。FFT算法除了必需的數(shù)據(jù)存儲(chǔ)器ram和旋轉(zhuǎn)因子rom外，仍需較復(fù)雜的運(yùn)算和控制電路單元，即使現(xiàn)在,實(shí)現(xiàn)長(zhǎng)點(diǎn)數(shù)的FFT仍然是很困難。本文提出的FFT實(shí)現(xiàn)算法是基于FPGA之上的，算法完成對(duì)一個(gè)序列的FFT計(jì)算，完全由脈沖觸發(fā)，外部只輸入一脈沖頭和輸入數(shù)據(jù)，便可以得到該脈沖頭作為起始標(biāo)志的N點(diǎn)FFT輸出結(jié)果。由于使用了雙ram，該算法是流型(Pipelined)的，可以連續(xù)計(jì)算N點(diǎn)復(fù)數(shù)輸入FFT，即輸入可以是分段N點(diǎn)連續(xù)復(fù)數(shù)數(shù)據(jù)流。采用DIF(Decimation In Frequency)-FFT和DIT(Decimation In Time)-FFT對(duì)于算法本身來(lái)說(shuō)是無(wú)關(guān)緊要的，因?yàn)閮煞N情況下只是存儲(chǔ)器的讀寫地址有所變動(dòng)而已，不影響算法的結(jié)構(gòu)和流程，也不會(huì)對(duì)算法復(fù)雜度有何影響。
標(biāo)簽： Transformation Discrete Fourier DFT
上傳時(shí)間： 2016-04-12
上傳用戶：lx9076
This example demonstrates how the C8051F06x SMBus interface can communicate // with a 256 byte I2C Serial EEPROM (Microchip 24LC02B). // - Interrupt-driven SMBus implementation // - Only master states defined (no slave or arbitration) // - Timer4 used by SMBus for SCL low timeout detection // - SCL frequency defined by <SMB_FREQUENCY> constant
標(biāo)簽： demonstrates communicate C8051F06x interface
上傳時(shí)間： 2016-04-12
上傳用戶：hanli8870
在DAB系統(tǒng)中的頻率同步，載頻同步，參考一下Carrier frequency offset estimation of DAB receiver based on phase reference symbol
上傳時(shí)間： 2014-11-23
上傳用戶：songrui
// // Histogram Sample // This sample shows how to use the Sample Grabber filter for video image processing. // Conceptual background: // A histogram is just a frequency count of every pixel value in the image. // There are various well-known mathematical operations that you can perform on an image // using histograms, to enhance the image, etc. // Histogram stretch (aka automatic gain control): // Stretches the image histogram to fill the entire range of values. This is a "point operation," // meaning each pixel is scaled to a new value, without examining the neighboring pixels. The // histogram stretch does not actually require you to calculate the full histogram. The scaling factor // is calculated from the minimum and maximum values in the image.
標(biāo)簽： Sample Histogram Grabber sample
上傳時(shí)間： 2013-12-15
上傳用戶：ryb
This paper presents the key circuits of a 1MHz bandwidth, 750kb/s GMSK transmitter. The fractional-N synthesizer forming the basis of the transmitter uses a combined phasefrequency detector (PFD) and digital-to-analog converter (DAC) circuit element to obtain >28dB high frequency noise reduction when compared to classicalfrequency synthesis.
標(biāo)簽： fractional-N transmitter bandwidth circuits
上傳時(shí)間： 2016-04-14
上傳用戶：er1219
這是手機(jī)開發(fā)用的全modem資料，歡迎下載，各radio廠家的都有。
標(biāo)簽： modem 手機(jī)開發(fā)
上傳時(shí)間： 2016-04-25
上傳用戶：gundan
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