Carrier-phase synchronization can be approached in a general manner by estimating the multiplicative distortion (MD) to which a baseband received signal in an RF or coherent optical transmission system is subjected. This paper presents a unified modeling and estimation of the MD in finite-alphabet digital communication systems. A simple form of MD is the camer phase exp GO) which has to be estimated and compensated for in a coherent receiver. A more general case with fading must, however, allow for amplitude as well as phase variations of the MD. We assume a state-variable model for the MD and generally obtain a nonlinear estimation problem with additional randomly-varying system parameters such as received signal power, frequency offset, and Doppler spread. An extended Kalman filter is then applied as a near-optimal solution to the adaptive MD and channel parameter estimation problem. Examples are given to show the use and some advantages of this scheme.
標簽： synchronization Carrier-phase multiplicativ approached
上傳時間： 2013-11-28
上傳用戶：windwolf2000
Level Crossing Rate in Terms of the Characteristic Function: A New Approach for Calculating the Fading Rate in Diversity Systems
標簽： Characteristic Calculating the Crossing
上傳時間： 2016-02-19
上傳用戶：shinesyh
This paper considers semiblind channel estimation and data detection for orthogonal frequency-division multiplexing (OFDM) over frequency-selective fading channels.
標簽： frequency-divis estimation orthogonal considers
上傳時間： 2014-12-07
上傳用戶：coeus
In this letter, the error performance of an ultra-wideband (UWB) system with a hybrid pulse amplitude and position modulation (PAPM) scheme over indoor lognormal fading channels is analyzed. In the PAPM UWB system, input data is modulated onto both the pulse amplitudes and pulse positions.
標簽： ultra-wideband performance amplitud letter
上傳時間： 2014-01-08
上傳用戶：yulg
There are two files in the zip folder. bpsk_spread.m and jakesmodel.m Steps for simulation: 1] Run jakesmodel.m first 2] Then run bpsk_spread.m . 3] Note that during the first run bpsk_spread.m has no rayleigh fading.This is because the corresponding code has been commented 4] The resulting performance is stored in BER_awgn. 5] Now uncomment the Rayleigh Fading code in bpsk_spread.m file. 6] Same time comment BER_awgn (line 112) and uncomment BER_ray variable. 7] Run the simulation. To compare the perfromances of the receiver using DSSS plot the BER_awgn and BER_ray
標簽： bpsk_spread jakesmodel simulation folder
上傳時間： 2016-05-19
上傳用戶：ynsnjs
bpsk算法程序，AWGN，fading環境下的分析
上傳時間： 2014-12-03
上傳用戶：mikesering
This a very simple baseband simulator for SC-FDMA system. This simulator is part of the upcoming book “Single Carrier FDMA: A New Air Interface for Long Term Evolution” (Wiley, Nov. 2008) which I co-authored with professor David J. Goodman at Polytechnic University. The purpose of this simulator is to give some concrete idea of how SC-FDMA system works. It does lack many realistic and sophisticated features such as channel coding, time-varying fading channel model, soft decision decoding, etc. Regardless, I am hoping that it will help you understand SC-FDMA which is a fairly new development in 3GPP LTE.
標簽： simulator This baseband upcoming
上傳時間： 2016-08-26
上傳用戶：小草123
Easy Grid is a JS/PHP tool kit for data linear lists management. It can help you to create quickly interfaces of table list navigation and modification with AJAX features. High performance of the Grid is ensured by JSON data format. The Easy Grid includes sorting, filtering, pagination and mouse right click context menu. Files: grid.html - HTML of the grid file_controller.php - sample of grid controller with file-flat interface db_controller.php - sample of grid controller with DB interface sample.csv - Sample of grid data source (VDB) sample.sql - Sample of grid data source (MySQL) easygrid.js - Easy Gird library easygrid_contextmenu.js - Easy Grid context menu library
標簽： management quickly create linear
上傳時間： 2013-12-04
上傳用戶：cylnpy
WLAN仿真－系統參數配置 系統參數主要分為2類： 一類是可以配置的，可以根據使用者的需求改變的參數 1）你打算讓這個仿真跑多少個OFDM符號？ 2）你打算采用什么樣的調制方式？ 3）你打算讓你的系統跑在什么樣的環境下，AWGN？Rayleigh fading? 4）你的接收端采用什么樣的配置，比如，是否采用理想均衡，線性插值均衡，理想同步，頻偏糾正等等？ 5）你的信道采樣頻率是多少？你的載波頻率是多少？ 一類是固定不變的，發送端按照協議規定設置的一些參數 1）子載波個數，包括數據子載波，導頻子載波。 2）保護間隔，pilot和preamble的數值。 舉例：比如將這些參數匯總在一個m文件，global_parameter.m
上傳時間： 2016-11-09
上傳用戶：aeiouetla
Error probability performance for W-CDMA systems with multiple transmit and receive antennas in correlated Nakagami fading channels
標簽： probability performance antennas multiple
上傳時間： 2014-01-08
上傳用戶：WMC_geophy
