forward-link DS-CDMA system
Performance Evaluation of a DS CDMA System in a Rayleigh Fading Environment
... sequence CDMA (DS-CDMA) and frequency hopping CDMA (FH-CDMA) are the two types of ...CDMA. DS-CDMA is the most popular between them for its simplicity, better ...
9
Design and Performance Analysis of DS-CDMA with Rake and without Rake Receiver Communication System
... a forward link channel (from the base station to the mobile phone) and also a reverse channel (revert back to the base station); each is being a single way ...
8
Performance of Reverse Link Synchronous DS CDMA System on a Frequency Selective Multipath Fading Channel with Imperfect Power Control
... of DS-CDMA system is mainly limited by multiple-access interference (MAI), and thus techniques to reduce the MAI, such as multiuser detection or interfer- ence cancellation, are currently of great ...
10
A Robust Parametric Technique for Multipath Channel Estimation in the Uplink of a DS CDMA System
... Direct sequence-code division multiple access (DS-CDMA) is a widely accepted multiple access technique already in use in several real-life systems, such as the universal mobile telecommunications standard ...
12
Improving the Throughput of DS CDMA Systems Using Adaptive Rate Transmissions Based on Variable Spreading Factors
... put values shown in Fig.5. From the results of Fig.6 we observe that for each group of (λ, µ) values, the constant rate scheme has a lower BER, than the adaptive rate scheme, while the BER of the adaptive rate ...
5
Performance and Analysis of DS CDMA Rake Receiver
... The rake receiver [3, 6] consists of multiple correlators, in which the receive signal is multiplied by time-shifted versions of a locally generated code sequence. The intention is to separate signals such that each ...
5
Pre-Decorrelation for Coded DS-CDMA System with Space-Time Block Coding
... processed system using pre-decorrelation with the application of turbo ...the system when using turbo-codes and convolutional codes using soft- decision Viterbi decoding ...
5
CDMA Based Secure Cellular Communication via Satellite Link
... Satellite link is chosen to link the Base Station Transceiver (BTS) and Base Station Controller (BSC), which is essential to overcome the Communication problems especially during natural disasters like ...
6
Reduced Rank Chip Level MMSE Equalization for the 3G CDMA Forward Link with Code Multiplexed Pilot
... the forward link in 3G CDMA ...high-speed CDMA multipath channels, the channel vector lies in the subspace spanned by a small number of columns of the pulse shaping filter convolution ...
16
Performance Enhancement of DS-CDMA System using Extended BPSK Modulation Scheme
... A DS-CDMA system is considered with 2 users using conventional BPSK modulation technique for transmission of information under AWGN environment. Generally, binary sequences are used and mutually ...
9
Sphere Decoding for Space time Multiuser Detection in STBC DS CDMA System
... uplink DS-CDMA system based on Alamouti STBC is proposed in order to restrain the multiple access interference (MAI) in DS-CDMA ...new system, data is modulated by BPSK and ...
5
FPGA Implementation of Low Complexity VLSI Architecture for DS CDMA Communication System
... The fundamental concept used for transmitter and receiver hardware of cellular communication system is implemented for CDMA scheme. Transceiver is realized by developing VHDL codes and testing the same for ...
8
VHDL Implementation of MAC based DSSS CDMA Protocol for Solving near Far Effect IN Ad hoc Network
... frequency. DS-CDMA is beneficial for Ad hoc network because it eliminates the requirement for any frequency or time-slot ...in DS-CDMA (Ad hoc network) is the hindrance of a near-far ...DSSS ...
8
Ant Colony Based Multiuser Detection for MC DS CDMA Systems
... (MC DS-CDMA) is widely recognized as a high-flexibility multiple-access ...for system designers and for channel-adaptive reconfiguration, when compared to both single-carrier DS-CDMA ...
5
Performance Analysis of A Ds Cdma System by using Rayleigh and Nakagami M Fading Channel
... With the tremendous increment in the users count and introduction of new features including web browsing. In the past few years, the request for bandwidth has started to surpass the availability in wireless networks. ...
5
Ternary Zero Correlation Zone Sequence Sets for Asynchronous DS CDMA
... asynchronous DS-CDMA system em- ploying Hayashi’s TZCZ (40, 8, 3), Hayashi’s TZCZ (20, 8, 1) and the proposed ternary ZCZ sequence sets with parameter TZCZ (32, 8, ...
10
A Multicarrier DS CDMA System Using Both Time Domain and Frequency Domain Spreading
... (MC DS- CDMA) scheme, which employs both time (T)-domain and frequency (F)-domain ...MC DS-CDMA, when communicating over an additive white Gaussian noise (AWGN) ...
5
Uplink channel power control improvement in DS CDMA system using channel predictions
... the system unstable. Solution for the escalation power and unstable system should be selected by improving the sending power from mobile stations to base station by taking into account the basic features of ...
39
Exact BER Calculation of Asynchronous DS CDMA Systems Communicating over Hoyt Channels
... Fig. 2. BER versus the number of users K in an asynchronous DS- CDMA system using random spreading sequences and BPSK modulation communicating over Hoyt channels. The length of the random spreading ...
5
Exact BER Performance of Asynchronous DS CDMA Systems using Quadriphase Spreading and QPSK Modulation over Rayleigh Channels
... modulated DS-CDMA systems the in- phase and quadrature-phase components are spreaded sep- arately ...asynchronous DS-CDMA systems [20], ...
5