CDMA/CD
Enabling dynamic spectrum access using SS MC CDMA
... By combining frequency domain and time domain dispersal of modulated symbols, two main variants of multi-carrier spread spectrum systems, the MC-CDMA and MC direct sequence CDMA MC-DS-CD[r] ...
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PAPR Reduction Based on Proposed Rotating Phase Shift Technique in MC CDMA Using FPGA
... In [7], the authors have proposed a lower complexity PAPR reduction scheme, which at the transmitter side a single IFFT block is used without any sub-block partitioning or phase factors. FPGA implementation of ...
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Slow Frequency Hopping Multicarrier DS CDMA for Transmission over Nakagami Multipath Fading Channels
... is a variable, allowing us to study the effect of different diversity orders. Upon exploiting the explicit knowledge of the FH patterns, detection can be implemented by demodulating only the active subcarriers. ...
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Fractionally Spread Multicarrier CDMA: A Multiple Access Scheme for Various Wireless Channels
... modulation and channel delay are assumed to be perfect esti- mates. By contrast, for the slowly fading channels considered, both the fading amplitudes as well as the phases are indepen- dent of the fraction index of n. ...
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Performance of multicarrier complementary coded CDMA under frequency selective Nakagami m fading channels
... Multicarrier complementary-coded code division Multiple Access (MC CC-CDMA) is becoming an attractive multiple access technique for high data rate transmission in future wireless communication systems. MC ...
9
Multicarrier DS CDMA: A Multiple Access Scheme for Ubiquitous Broadband Wireless Communications
... Multiuser detection (MUD) is a highly efficient detection technique, which is capable of attain- ing near-single-user performance, while support- ing a multiplicity of users and hence increasing the user capacity of ...
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Analytical Bit Error Rate Performance of DS CDMA Ad Hoc Networks using Large Area Synchronous Spreading Sequences
... The family of large area synchronous (LAS) [1] spreading codes exhibits an interference free window (IFW), where the off-peak aperiodic auto-correlations and cross- correlations become zero [2]. These attractive ...
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A novel Chaotic Collaborative CDMA scheme under Rayleigh fading
... Chaotic communication aims at providing security for information transmitted through various communication channels. Wireless communication system generations including the forthcoming 5th generation (5G) strive for ...
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A Unified Approach to the Analysis of Multicarrier DS CDMA over Nakagami $M$ Fading Channels
... tive users, K, in the context of the multitone, as well as the orthogonal and ‘spacing-optimized’ MC DS-CDMA schemes in terms of m = 1, 2 and ∞ . According to the results we observe that when m = 1, 2 and K < ...
5
A Proposed Turbo Coded Wavelet Packet Modulation based MC CDMA
... In this section, the channel was considered to be a multipath fading channel. Simulations of parallel concatenated convolutional coded PCCC data for both FFT MC-CDMA system and DWPT MC-CDMA system were ...
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BER performance of MC DS CDMA systems in the presence of timing jitter : a thesis presented in partial fulfillment of the requirements for the degree of Master of Engineering in Information and Telecommunication Engineering at Massey University, Palmerston North, New Zealand
... The MC-DS-CDMA systems are more sensitive to errors in sampling time which is generally called timing jitter than single-carrier systems due to the use of large number of sub-carriers. Timing jitter caused by ...
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Performance Comparison of FH/MC DS CDMA with Single and Multi Carrier DS CDMA
... The multiple-access scheme is constituted by frequency-hopping FH based multicarrier DS-CDMA FWMC DS-CDMA, where the entire bandwidth of future systems can be divided into a number of su[r] ...
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LAS CDMA using Various Time Domain Chip Waveforms
... Figure 3 portrays the BER versus channel SNR performance comparison ofrandom code based classic CDMA and LAS CDMA in conjunction with the various chip-waveforms considered, when communic[r] ...
5
On the Uplink Performance of LAS CDMA
... resolvable paths, respectively. The reason that the LAS-CDMA scheme outperforms the traditional DS-CDMA system is that the MAI and MPI is reduced, as a benefit of using LAS codes. Figure 7 exhibits the ...
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PAPR reduction in SFBC MIMO MC-CDMA systems via user reservation
... The particular construction of Hadamard matrices imposes their columns to follow highly structured pat- terns, thus, making WH codes to substantially depart from ideal pseudo-noise sequences. The most important ...
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Implementation of CDMA Encoding/Decoding Method for On Chipusing Verilog
... In this work, we exhibited the ACDMA NoC crossbar to empower parallel transmission of multi- bit information bundles on a solitary CDMA channel. The overhead of channel replication is moderated which results in up ...
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Optimum Detection of CDMA
... asynchronous CDMA with Walsh-Hadamard Code or Pseudo random sequence as the spreading ...synchronous CDMA, we transmit , where C n,i is the chip sequence ...
5
Analysis of Carrier Frequency Selective Offset Estimation - Using Zero-IF and ZCZ In MC-DS-CDMA
... al-to-parallel converted data stream is multiplied with the spreading sequence, and then the chips belonging to the same symbol modulate the same subcarrier. Here the spreading is done in the time domain. Thus this ...
5
Exploring the reconfigurability options of multi carrier CDMA in cognitive radio systems
... Two main variations of the multi-carrier spread spectrum sys- tems are the MC-CDMA (frequency domain spreading) and MC direct sequence CDMA (MC-DS-CDMA) (time domain spreading). One way of looking at ...
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Performance of Generalized Multicarrier DS CDMA over Nakagami $m$ Fading Channels
... From 1991 to 1993, he was a Lecturer in the Department of Electrical Engineering, East-China Jiaotong University, China. From 1993 to 1997 he was with the Modern Communications Research Institute, Northern Jiaotong ...
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