Location:
Search - mimo frequency
Search list
Description: Multiple input multiple output techniques combined
with orthogonal frequency division multiplexing (MIMO-OFDM)
provide a promising approach for wireless systems. However, a
serious drawback of the OFDM system is the high peak-toaverage
power ratio (PAPR), which may severely affect the
power efficiency of RF power amplifiers. In this paper, we
propose a simple method to reduce the PAPR of MIMO-OFDM
signals based on the use of unused subcarriers. Instead of
processing the signals at each transmitter separately, a peak
cancelling signal is generated at one antenna and is then applied
to all the others with only simple modifications. Simulation has
shown that a minimum 2 dB reduction in PAPR can be achieved
for all transmit signals using this approach. As the signal
processing is nearly all done at a single transmitter, repetition of
the operations at each transmitter is avoided, and therefore the
overall cost of the system can be significantly reduced.
Platform: |
Size: 714752 |
Author: payal |
Hits:
Description: Multiple input multiple output techniques combined
with orthogonal frequency division multiplexing (MIMO-OFDM)
provide a promising approach for wireless systems. However, a
serious drawback of the OFDM system is the high peak-toaverage
power ratio (PAPR), which may severely affect the
power efficiency of RF power amplifiers. In this paper, we
propose a simple method to reduce the PAPR of MIMO-OFDM
signals based on the use of unused subcarriers. Instead of
processing the signals at each transmitter separately, a peak
cancelling signal is generated at one antenna and is then applied
to all the others with only simple modifications. Simulation has
shown that a minimum 2 dB reduction in PAPR can be achieved
for all transmit signals using this approach. As the signal
processing is nearly all done at a single transmitter, repetition of
the operations at each transmitter is avoided, and therefore the
overall cost of the system can be significantly reduced.
Platform: |
Size: 5120 |
Author: payal |
Hits:
Description: RFX2401一款高性能PA 用于蓝牙、WLAN、Zigbee和MIMO设计的两个高度集中单芯片及单芯片解决方案是首个RF前端集成电路(RFeICs)。RFX2401主要应用于蓝牙1级和单端口Zigbee。该芯片在BiCMOS器件中集成了功率放大器、LNA、发送和接收开关电路、相关匹配网络、以及谐波滤波器。
前端的优越性能、高灵敏度和效率、低噪音、小型化和低成本使其非常适用于需要扩展范围和带宽的应用，这种扩散可能是10x的。RFX2401具有集成功率检测电路，只需一个外接电源电容器和用于TX-RX端口的带通滤波器。设计应用于802.11x和双端口Zigbee，工作频率为2.4 GHz.尤其适合单天线应用或作为MIMO应用的模块-RFX2401 a high-performance PA for bluetooth, WLAN, Zigbee and MIMO design of two highly centralized single chip and single chip solutions is the first RF front integrated circuit (RFeICs). RFX2401 mainly used in bluetooth grade 1 and single port Zigbee. The chip in BiCMOS device integration of power amplifiers, LNA, send and receive switch circuit, correlation matching network, and harmonic filter.
The front end of the superior performance, high sensitivity and efficiency, low noise, miniaturization, and low cost that make it particularly applicable to need to expand the application range and bandwidth, this diffusion may be 10 x. RFX2401 has integrated power detection circuit, just a capacitor and external power supply for TX-RX port of bandpass filter. Design used in 802.11 x and dual port Zigbee, work for 2.4 GHz frequency, especially suitable for single antenna application or as a MIMO application ?
Platform: |
Size: 309248 |
Author: 粟学林 |
Hits:
Description: the use of coherent space-frequency coding in orthogonal frequency division multiplexing (OFDM)-based frequency-selective multiple-input multiple-output (MIMO) antenna fading channels has been proposed. Acquiring knowledge of the fading coefficients in a MIMO channel is already very challenging in the frequency-flat (fast) fading case. In the frequency-selective case, this task becomes significantly more difficult due to the presence of multiple paths, which results in an increased number of parameters to be estimated. In this paper, we address code design for noncoherent frequency-selective MIMO-OFDM fading links, where neither the transmitter nor the receiver knows the channel. We derive the code design criteria
Platform: |
Size: 32768 |
Author: sourov |
Hits:
Description: 基于3GPP LTE系统的2X2的信道估计链路源程序；硕士毕业论文时编写，属原创,包括时域和频域的MIMO信道估计-Based on the 3 GPP LTE system，
estimate MIMO 2 X2 channel program belong to original, including the time domain and frequency domain MIMO channel estimation
Platform: |
Size: 164864 |
Author: luli |
Hits:
Description: MIMO-OFDM This contains 70 .m files for a complete simulation of a MIMO-OFDM channel. including pilot aided channel estimation, coding, MRC and frequency synchronization.It uses Jack rayleigh channel model
Platform: |
Size: 811008 |
Author: Sherra |
Hits:
Description: Abstract—In this paper, we study the joint estimation of inphase
and quadrature-phase (I/Q) imbalance, carrier frequency
offset (CFO), and channel response for multiple-input multipleoutput
(MIMO) orthogonal frequency division multiplexing
(OFDM) systems using training sequences. A new concept called
channel residual energy (CRE) is introduced. We show that by
minimizing the CRE, we can jointly estimate the I/Q imbalance
and CFO without knowing the channel response. The proposed
method needs only one OFDM block for training and the training
symbols can be arbitrary. Moreover when the training block
consists of two repeated sequences, a low complexity two-step
approach is proposed to solve the joint estimation problem.
Simulation results show that the mean-squared error (MSE) of
the proposed method is close to the Cramer-Rao bound (CRB).
Index Terms—MIMO OFDM, CFO, I/Q imbalance, channel
estimation.
Platform: |
Size: 551936 |
Author: santhu |
Hits:
Description: Abstract—In this paper, we study the joint estimation of inphase
and quadrature-phase (I/Q) imbalance, carrier frequency
offset (CFO), and channel response for multiple-input multipleoutput
(MIMO) orthogonal frequency division multiplexing
(OFDM) systems using training sequences. A new concept called
channel residual energy (CRE) is introduced. We show that by
minimizing the CRE, we can jointly estimate the I/Q imbalance
and CFO without knowing the channel response. The proposed
method needs only one OFDM block for training and the training
symbols can be arbitrary. Moreover when the training block
consists of two repeated sequences, a low complexity two-step
approach is proposed to solve the joint estimation problem.
Simulation results show that the mean-squared error (MSE) of
the proposed method is close to the Cramer-Rao bound (CRB).
Index Terms—MIMO OFDM, CFO, I/Q imbalance, channel
estimation.
Platform: |
Size: 277504 |
Author: santhu |
Hits:
Description: 基于导频信号的MLD和ZF检测的MIMO系统-The frequency of the signal based on MLD and ZF detection multiple-input multiple-output (MIMO) system
Platform: |
Size: 626688 |
Author: owen |
Hits:
Description: Every thing about MIMO system and OFDM, including Matlab source, timing, frequency synchronization, equalization, estimation, PAPR, space time block code, channel capacity
Platform: |
Size: 8389632 |
Author: nonicknoname |
Hits:
Description: Analysis of frequency and channel estimator for down link of MIMO OFDM system-The analysis should be done based on MATLAB codes, which includes parameters like SNR, SINR
Platform: |
Size: 435200 |
Author: 崽崽 |
Hits:
Description: 宽带无线通信是信息化社会发展的助推器，它正在改变人们的生活方式，人
们将可以在任何时候、任何地点享受数字冲浪、视频点播、时频会议等新的时髦。
MIMO系统的信道容量与发射端和接收端的最小天线数成线性关系，这使MIMO技
术成为LTE、B3G和未来4G系统中最有前途的技术之一。-Broadband wireless communication is the booster for the development of information society, it is changing people s way of life, man
They will be able to at any time, anywhere to enjoy digital surfing, video on demand, such as time-frequency meeting new fashionable.
Channel capacity of MIMO system and the transmitting terminal and receiving the minimum antenna number into a linear relationship, the MIMO technology
Art become a future 4 g LTE, B3G, and one of the most promising technologies in the system.
Platform: |
Size: 1436672 |
Author: liu |
Hits:
Description: 正交频分复用，多输入多输出的信道估计的matlab程序，经过验证可以直接运行-Orthogonal frequency division multiplexing MIMO channel estimation matlab program can be run directly, proven
Platform: |
Size: 2048 |
Author: 郭岩 |
Hits:
Description: large.
The second technique is the time–frequency domain equalization with channel shortening [29]. A time-domain equalizer is inserted to reduce the MIMO channels to the ones with the channel length shorter than or equal to the CP length, and then, a one-tap frequency-domain equalizer is applied to each subcarrier. When the MIMO channels are shortened by the time-domain equalizer, residual ICI and ISI are introduced. They cannot be eliminated by the subsequent frequency-domain equalizer and, thus, limit the performance.
Platform: |
Size: 295936 |
Author: uunuu0717 |
Hits:
Description: mimo-ofdm的源代码文件，搭建ofdm的框架-Orthogonal Frequency Division Multiplexing
Platform: |
Size: 2048 |
Author: 辉 |
Hits:
Description: A 2x2 multiple-input multiple-output (MIMO) architecture
using dual-polarized antennas (DPAs) is considered
with orthogonal frequency division multiplexing (OFDM). The
performance of DPAs is evaluated for adaptive polarization
(AP) transmission techniques in time-varying multipath channels
impaired by polarization mode dispersion (PMD) and
polarization-dependent loss (PDL). AP transmission techniques
considered include power gain maximization, polarization dispersion
minimization for interference avoidance, polarization
multiplexing with waterfilling, and a suboptimal multiplexing
strategy that enables direct recovery of the polarization multiplexed
streams, thereby simplifying the design of the receiver.
Measured time-varying dual-polarized channel realizations from
mobile-to-mobile experiments are used to estimate the capacity,
diversity, and interference avoidance performance of the adaptive
approaches.
Platform: |
Size: 1401856 |
Author: room |
Hits:
Description: MIMO信道容量的仿真代码 在频域中对频率选择性无线信道转化为并行的子信道并计算其信道容量。-The simulitation program of capacity of MIMO channel.Computes the capacity in bits/s/Hz (bps/Hz) for frequency-selective wireless channels defined as a set of parallel channels in the frequency domain. The capacity is computed with channel knowledge at the transmitter side by using water filling power allocation over frequency (CTxWF) and without channel knowledge at the transmitter side
Platform: |
Size: 2048 |
Author: 小小学 |
Hits:
Description: mimo-ofdm系统中导频间的信道差值算法代码-mimo-ofdm system guide channel frequency difference between the algorithm code
Platform: |
Size: 1024 |
Author: 张仁烨 |
Hits:
Description: Simulation if the MIMO OFDM with frequency offset and multhipath channel
Platform: |
Size: 135168 |
Author: igigi |
Hits:
Description: Spectrally Efficient Time-Frequency Training
OFDM for Mobile Large-Scale MIMO Systems
Platform: |
Size: 547840 |
Author: NINU RACHEL PHILIP |
Hits: