Accurate BER Analysis of QPSK Modulated Asynchronous DS-CDMA Systems Communicating over Rayleigh Channels

Liu, Xiang; Hanzo, Lajos

doi:10.1109/vetecs.2006.1683124

Cited by 2 publications

(2 citation statements)

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“…The main reason for using PN sequences here is that it can retain the same transmitter sequence at the receiver side along with the same properties. The probability of error for users in a CDMA system with PN sequences is given by Equation 14 [21].…”

Section: -2-ds-cdmamentioning

confidence: 99%

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Cancellation Techniques for Co-channel Interference in MIMO-OFDM Systems and Evaluating Their Performance

Rajesh

Rajak

2021

Emerg Sci J

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In a wireless communication system, the transmitted signal is exposed to various surfaces where it bounces and results in several delayed versions of the same signal at the receiver end. The delayed signals are in the form of electromagnetic waves that are diffracted and reflected from the various object surfaces. These result in co-channel interferences for wireless systems. MIMO has proven to be a striking solution for the new generation of wireless systems. MIMO-OFDM system with QPSK modulation is considered as the wireless system for studying the performance of interference cancellation techniques. The BER performance is studied in channels such as Rayleigh and Rician Fading Channels. The effects of interference are reduced to a certain extent by the inclusion of CDMA (spread spectrum technique) as Technique 1. The effects of interference on this system have been further reduced using the LMS filter as Technique 2. Hence, to show better performance in MIMO-OFDM systems, it is recommended to employ both CDMA and LMS filters to decrease the effects of co-channel interference. It is observed that the parameter BER reduces as the SNR increases for both these channels. Doi: 10.28991/esj-2021-01313 Full Text: PDF

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Section: -2-ds-cdmamentioning

confidence: 99%

“…where n represents the number of classes of PN sequences, 𝐵 is given as the number of chip boundaries with chip-value transitions and, 𝑃 𝑒|𝐵 , the conditional probability is given by Equation 15 [21];…”

Section: -2-ds-cdmamentioning

confidence: 99%