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123
为了提高MIMO-OFDM系统的数据传输率和频谱利用率,提出一种新的自适应算法。该算法在保证信道质量所需误码率和总发射功率的前提下,按照各个子载波衰落程度动态地分配比特和功率,使系统的总数据传输速率最大。理论分析得出,该算法降低了系统运算复杂度,能很大地改善系统的整体性能。(In order to improve data transmission rates and spectrum efficiency of MIMO-OFDM systems,this paper proposes a new adaptive algorithm. While the channel transmission quality to meet the requirements of a certain target BER(bit error rate) and total emissive power,according to each sub-carrier decline degree to adjust each sub-carrier modulation method freely,try to minimize the total data rate of system. Theory analysis shows the algorithm can reduce system complexity and improve overall performance of the ...)
- 2011-09-05 15:22:03下载
- 积分：1
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QPSK
QPSK调制解调函数 MatlaB自编函数(QPSK modulation and demodulation functions)
- 2020-11-29 22:09:27下载
- 积分：1
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2
说明： 2. 关于无线信道的多普勒谱，请回答以下问题：
(1) 在某些无线信道中，多普勒频移会引起无线信道输出信号的混叠。请描述产生混叠的各种原因；
(2) 无线信道中的多普勒谱有一种经典谱(classic spectrum)，请解释产生这种谱形状的机理；
(3) 请用Simulink工具编写代码(S-Function方式)，产生一单径瑞利信道，其多普勒谱为经典谱，其中移动速率为120km/h。并请描述：自己用计算机产生的经典谱是正确的依据。(2. Regarding the doppler spectrum of the wireless channel, please answer the following questions:
(1) in some wireless channels, doppler frequency shift will cause aliasing of the output signals of the wireless channel.Describe the various causes of aliasing;
(2) there is a classic spectrum in the doppler spectrum in the wireless channel, please explain the mechanism of producing this spectrum shape;
(3) please use Simulink tool to write code (s-function mode) to generate a single-path Rayleigh channel, whose doppler spectrum is the classical spectrum, in which the moving rate is 120km/h.And please describe: your own computer generated classical spectrum is the correct basis.)
- 2019-01-15 10:49:35下载
- 积分：1
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Hilbert_text1
希尔伯特变换测试，使用希尔伯特变换对信号处理，相位偏移90°(The Hilbert transform test uses Hilbert transform to process the signal with a phase shift of 90 degrees)
- 2020-12-29 18:19:01下载
- 积分：1
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duoxianpreadth
多线程串口编程，程序是使用arm加华为的GPRS模块进行测试 方便大家修改(Multithread serial programming, program is to use the arm GPRS module testing Huawei to facilitate change)
- 2013-08-13 13:41:25下载
- 积分：1
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fangzhenjishu
扩频通信系统实用仿真技术一书的所有源代码,包括 信道编码译码(有LDPC码),扩频调制,载波调制,PN码同步,窄带干扰抑制,直扩频系统仿真实列,跳频系统仿真实例等(spread spectrum system simulate technology)
- 2020-11-15 21:09:41下载
- 积分：1
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D8active
访问市场上流行的德卡公司的接触非接触读卡器程序(Access to the market the company' s exposure to the popular de non-contact reader program)
- 2011-05-31 16:22:53下载
- 积分：1
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05970438
手机GSM TI 平台 dma 驱动 源代码(Mobile phone GSM TI platform dma driver source code)
- 2019-01-06 22:32:53下载
- 积分：1
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pi/4-dqpsk-1的verilog工程
说明： pi/4-dqpsk-1的verilog工程，实现电脑与FPGA自发自收(pi/4-dqpsk-1,It can realize the self receiving of computer and FPGA)
- 2020-07-19 19:41:35下载
- 积分：1
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AMC
说明： 本文主要从自适应调制的算法及实现出发，引入了OFDM子载波分组的概念，详细阐述了五种固定阈值算法和子带BER预估计算法的原理及实现，并在此基础上加入自适应编码，实现自适应调制与编码。(Based on the algorithm and implementation of adaptive modulation, this paper introduces the concept of OFDM subcarrier grouping, elaborates the principle and implementation of five fixed threshold algorithms and subband BER estimation algorithm, and adds adaptive coding to realize adaptive modulation and coding.)
- 2021-04-10 10:11:13下载
- 积分：1
