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Description: Error probability performance for W-CDMA systems with multiple transmit and receive antennas in correlated Nakagami fading channels
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Size: 960512 |
Author: xiliqian |
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Description: 复接入，B/W双用户使用直接扩频序列
％ >>>multiple access b/w 2 users using DS CDMA
％ >>>format is : cdmamodem(user1,user2,snr_in_dbs)
％ >>>user1 and user2 are vectors and they should be of equal length
％ >>>e.g. user1=[1 0 1 0 1 0 1] , user2=[1 1 0 0 0 1 1],snr_in_dbs=-50
％ >>>or snr_in_dbs=50 just any number wud do
％ Waqas Mansoor
％ NUST , Pakistan-Complex access, B/W dual-use direct sequence spread spectrum>>> multiple access b/w 2 users using DS CDMA>>> format is: cdmamodem (user1, user2, snr_in_dbs)>>> user1 and user2 are vectors and they should be of equal length>>> eg user1 = [1 0 1 0
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Size: 2048 |
Author: hws |
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Description: 功能：CDMA调变
multiple access b/w 2 users using DS CDMA-multiple access b/w 2 users using DS CDMA
format is : cdmamodem(user1,user2,snr_in_dbs)
user1 and user2 are vectors and they should be of equal length
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Size: 2048 |
Author: jane |
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Description: 2个用户的DS CDMA ，2个用户长度必须相等-multiple access b/w 2 users using DS CDMA
user1 and user2 are vectors and they should be of equal length
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Size: 2048 |
Author: QI Dunjin |
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Description:
W-CDMA stands for Wideband Code Division Multiple Access
Its an air interface standard found in 3G mobile telecommunications networks designed for “always-on” packet-based wireless service, so that computers entertainment devices and telephones may all share the same wireless network and be connected to the internet, anytime anywhere.
It was adopted as a standard by the ITU under the name "IMT-2000 direct spread."
It is the technology used in the Universal Mobile Telecommunications System (UMTS) and is also known as UMTS-FDD.
It utilizes the DS-CDMA channel access method and the FDD duplexing method to achieve higher speeds and support more users compared to most time division multiple access (TDMA) schemes used today.
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Size: 1129472 |
Author: Aanandha Saravanan |
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Description: DS-CDMA实现基本过程：
<TRANSMITTING END>待传信息--NRZ变换（变成NRZ码）---调制（乘以sqrt(2*eb)*cos(2*w*t)）----扩频（乘以m序列或其他伪随机码）
----信道中传输（有加性噪声）<DURING THE CHANNEL>
---解扩（乘以相同的m序列或其他伪随机码）---解调（乘以sqrt(2*eb)*cos(2*w*t)）----比特判别（sum(i)>0-->1 sum(i)<0--->0）-DS-CDMA to achieve the basic process: <TRANSMITTING END> Information to be passed- NRZ transformation (into NRZ code)--- modulated (multiplied by sqrt (2* eb)* cos (2* w* t ))---- spread spectrum (multiplied by the m-sequence or other pseudo- random code)---- channel transmission (with additive noise) <DURING THE CHANNEL>--- Despreading (multiplied by the same pseudo-random m-sequences or other code)--- demodulation (multiplied by sqrt (2* eb)* cos (2* w* t ))---- bit identification (sum (i)> 0-> 1 sum (i) < 0---> 0)
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Size: 2048 |
Author: mlj |
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