Performance Analysis of Subspace Based Downlink Channel Estimation for W-CDMA Systems Using Chaotic Codes

Sangeetha, M.; Bhaskar, Vidhyacharan

doi:10.1007/s11277-012-0793-1

Cited by 5 publications

(6 citation statements)

References 31 publications

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“…The delay profile as exhibited in Table III, we speculate a 3 dB loss in average power for whole 4μs of path delay [26] . We have calculated BER for 1 st and 2 nd order of modified RM (1,5), RM(2,3) codes and original RM (1,5),RM(2,3) codes as shown in Fig. 2.…”

Section: Simulation Results and Discussionmentioning

confidence: 99%

“…For BER computation two researchers introduced blind channel estimation for downlink Wideband Code Division Multiple Access (W-CDMA) system that applied Chaotic codes and Walsh code. Regarding, Chaotic codes and Walsh code, at SNR = 12dB they calculated BER of 1 × 10-4 and 13 × 10-4 respectively [20]. Some investigators presented noticeable BER can be accomplished by employing Multi-code DS/CDMA approach in the multi-path fading channel [21].…”

Section: Related Workmentioning

confidence: 99%

“…To check system integrity of blind channel estimation they have employed BER for measuring their system performance [5]. Some investigators showed that employing multi-code i.e., Direct-Sequence Code Division Multiple Access (DS-CDMA) channelization scheme improves BER in multipath fading channel [6].…”

Section: Introductionmentioning

confidence: 99%

“…1. BER [10][11][12]. The ratio of erroneous bits (received) to the overall bits transferred over a wireless channel is known as BER.…”

Section: Introductionmentioning

confidence: 99%

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Performance Evaluation of MRMED Algorithm by Monitoring BER

Rizwan-ul-Hasan

Tahir

2021

SSURJ

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In this research work, we have developed a communication system (transmitter / receiver) to control peak to average power (PAPR) with small bit error rate (BER) for a 4G system called multicode code division multiple access (MCCDMA). Proposed communication system works on modified Reed Muller encoded data (MRMED) string. In MRMED data is first encoded with Reed Muller (RM) code. Thereafter, encoded RM message is XORed with optimal binary string, which results lower Peak to Average Power ratio (PAPR). A well-known fact is that, bit error rate (BER) is the best performance measurement tool for a communication system. To check the integrity of our communication system, we have run the simulation for monitoring BER using MRMED sequence. Simulation work conducted, with multipath Rayleigh fading, Minimum Shift Keying (MSK) modulation and several orders of RM codes. Our results show that implementing MRMED sequences of the suggested MCCDMA communication structure, returns noticeable lower BER. For instance, in case of RM(1,4), that has error improvement proficiency of 3 (three) errors , returns BER = 8.2x10−5 adopting MSK, at SNR = 12dB. Similarly, for RM(2,3), which has error improvement efficiency of 0 error and shows distinct BER of 4.9x10−4 at 12dB (SNR).In addition to using simulation for checking BER performance of our communication system, we have also shown in our results that, as the error improvement capability of different RM codes surges, correspondingly we get a lower BER.

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Section: Simulation Results and Discussionmentioning

confidence: 99%

Section: Related Workmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…1. BER [10][11][12]. The ratio of erroneous bits (received) to the overall bits transferred over a wireless channel is known as BER.…”

Section: Introductionmentioning

confidence: 99%

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Performance Evaluation of MRMED Algorithm by Monitoring BER

Rizwan-ul-Hasan

Tahir

2021

SSURJ

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“…Performance of these systems can degrade if fading coefficients are complex and the correct channel coefficients are not known at the receiver. Various adaptive equalization algorithms and corresponding BER performance for CDMA system with binary spreading codes have been investigated in [24][25][26][27][28] but none of these were used in chaos based CDMA system. Further, complex fading coefficients are estimated using Bayesian estimator in [14,29] and with least mean square (LMS) in [30,31] for chaos based CDMA systems.…”

Section: Introductionmentioning

confidence: 99%

Maximal Ratio Combining Using Channel Estimation in Chaos Based Pilot-Added DS-CDMA System with Antenna Diversity

Patel

Berber

Sowerby

2017

Wireless Communications and Mobile Computing

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This paper presents an adaptive multiuser transceiver scheme for DS-CDMA systems in which pilot symbols are added to users’ data to estimate complex channel fading coefficients. The performance of receiver antenna diversity with maximal ratio combining (MRC) technique is analyzed for imperfect channel estimation in flat fading environments. The complex fading coefficients are estimated using least mean square (LMS) algorithm and these coefficients are utilized by the maximal ratio combiner for generating the decision variable. Probability of error in closed form is derived. Further, the effect of pilot signal power on bit error rate (BER) and BER performance of multiplexed pilot and data signal transmission scenario are investigated. We have compared the performance of added and multiplexed pilot-data systems and concluded the advantages of both systems. The proposed CDMA technique uses the chaotic sequence as spreading sequence. Assuming proper synchronization, the computer simulation results demonstrate the better bit error rate performance in the presence of channel estimator in the chaotic based CDMA system and the receiver antenna diversity technique further improves the performance of the proposed system. Also, no channel estimator is required if there is no phase distortion to the transmitted signal.

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Region Splitting-Based Resource Partitioning with Reuse Scheme to Maximize the Sum Throughput of LTE-A Network

Ezhilarasi

Bhuvaneswari

2019

Emerging Trends in Computing and Expert Technology

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Performance Analysis of Subspace Based Downlink Channel Estimation for W-CDMA Systems Using Chaotic Codes

Cited by 5 publications

References 31 publications

Performance Evaluation of MRMED Algorithm by Monitoring BER

Performance Evaluation of MRMED Algorithm by Monitoring BER

Maximal Ratio Combining Using Channel Estimation in Chaos Based Pilot-Added DS-CDMA System with Antenna Diversity

Region Splitting-Based Resource Partitioning with Reuse Scheme to Maximize the Sum Throughput of LTE-A Network

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