Transmitter optimization in diversity assisted synchronous CI/MC-CDMA uplink systems using genetic algorithm

Hati, Sumanta; Maity, Santi P.; Mandal, Mrinal

doi:10.1109/bsc.2008.4563206

Cited by 4 publications

(4 citation statements)

References 10 publications

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“…The bit (for BPSK) or symbol (for QPSK) duration is the measure of data rate. Interested readers may go through the work of Maity et al [42] for implementation and performance analysis of mobile transmission channel under Rayleigh fading. The bit rate 100 Kbit/S indicates bit duration of 0.1 microsecond and accordingly bit durations are set for other bit rates.…”

Section: Results For Qos Assessmentmentioning

confidence: 99%

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Dual purpose FWT domain spread spectrum image watermarking in real time

Maity

Kundu

Maity³

2009

Computers & Electrical Engineering

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Spread spectrum (SS) watermarking for multimedia signal becomes appealing due to its high robustness attribute and is used widely for various applications. Some of these applications essentially demand development of low cost algorithms so that they can be used for real time services such as broadcast monitoring, security in communication etc. In recent time one popular non-conventional application of digital watermarking becomes promising that assesses blindly the QoS (quality of services) of the multimedia services which is expected to be offered by the future generation mobile radio network. Majority of the existing SS watermarking schemes suffer from high computation cost and complexity leading to the difficulty for realtime implementation and limits their usage for the above mentioned applications. This paper proposes Fast Walsh Transform (FWT) based SS image watermarking scheme that serves the dual purposes of authentication in data transmission as well as QoS assessment for digital media through dynamic estimation of the wireless channel condition. Fast Walsh transform offers low computation cost for implementation, smaller change in image (multimedia signal) information due to data embedding and ease of hardware realization. VLSI implementation using Field Programmable Gate Array (FPGA) has been developed to make it suitable for real time implementation.

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Section: Results For Qos Assessmentmentioning

confidence: 99%

“…We simulate the effect of Rayleigh fading channel to the watermarked image to characterize the behaviour of multipath channel [42]. We take help of MAT-LAB raylrnd (b) function to simulate the characteristics of fading channel where the mean of the distribution with parameter b is b π/2 and variance is (4 − π)b 2 /2.…”

Section: Results For Qos Assessmentmentioning

confidence: 99%

Dual purpose FWT domain spread spectrum image watermarking in real time

Maity

Kundu

Maity³

2009

Computers & Electrical Engineering

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“…However, the effect of high capacity in MC-CDMA with BPSK modulation has a trade-off relationship on PAPR and BER performance [2]. Optimization strategy may be used to resolve this trade-off as part of the following constraints that are inherent in wireless mobile communication.…”

Section: Introductionmentioning

confidence: 99%

“…This is due to fact that as superimposed sequences tend to cancel out the elements of several subcarriers. If the effective number of subcarriers gets reduced without change in total average power, eventually PAPR will be smaller [2]. However, deliberate addition of unused sequences i.e.…”

Section: Introductionmentioning

confidence: 99%

On optimization of CI/MC-CDMA system

Maity

Mukherjee

2009

2009 IEEE 20th International Symposium on Personal, Indoor and Mobile Radio Communications

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This paper proposes a new model of high capacity carrier interferometry/multicarrier code division multiple access (CI/MCCDMA) system through the simultaneous support of high and low data rate transmission using odd and even subcarriers. Reduction in peak-to-average power ratio (PAPR) is achieved through the phase shift of even (odd) CI code using odd (even) sub-carriers by an amount of π/2 and odd (even) CI code using odd (even) sub-carriers by -π/2, all angles measured with respect to the orthogonal codes supporting high data rate transmission. The CI code optimization is done for further reduction in PAPR values. Specifically, assuming a frequency selective Rayleigh-fading channel, bit error rate (BER) at receiver is improved through the cancelation of MAI (multiple access interference) at subcarriers level using PIC (parallel interference cancelation) at reduced computation cost. Finally, the system is optimized with respect to the number of subcarriers, number of users (capacity) and signal-to-noise ratio (SNR) using GAs (Genetic Algorithms) to achieve an acceptable set of values for BER, PAPR and average data rate (ADR).

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Combined phase and code optimization for PAPR reduction in M-ary CI/MC-CDMA system

Maity

Mukherjee

2009

2009 First UK-India International Workshop on Cognitive Wireless Systems (UKIWCWS)

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Transmitter optimization in diversity assisted synchronous CI/MC-CDMA uplink systems using genetic algorithm

Cited by 4 publications

References 10 publications

Dual purpose FWT domain spread spectrum image watermarking in real time

Dual purpose FWT domain spread spectrum image watermarking in real time

On optimization of CI/MC-CDMA system

Combined phase and code optimization for PAPR reduction in M-ary CI/MC-CDMA system

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