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Predistortion is a well know method used in the linearization process of high power amplifier. In this paper, a stegnographic approach has been introduced during the digital predistortion. The proposed stego predistorter gives double advantage over conventional LUT predistorter 1. Reduction of bit error rate 2. Secret data transferred between sender and receiver. The work has been implemented in OFDM...
This paper introduces an efficient code allocation algorithm for multirate carrier interferometry/multicarrier code division multiple access (CI/CM-CDMA) system through simultaneous support of high and low data rate transmission. High priority users are assigned all subcarriers to transmit at high data rate, while low data rate users are gradually increased through alternate allocation of odd-even...
Under the Universal Mobile Telecommunication system (UMTS) environment the third generation (3G) system is used to integrate a wide variety of communication services such as high speed data, video & multimedia traffic. But one of the biggest draw back of wireless environment is the limited bandwidth. However, the users sharing this limited bandwidth have been increased considerably by using Space...
This paper introduces an improved iterative soft decision subcarrier parallel interference cancellation (SDSub-PIC) technique for the carrier interferometry/multicarrier code division multiple access (CI/MC-CDMA) system that significantly reduces the multiple access interference (MAI) for the desired user. Carrier interferometry (CI) codes are used to minimize the cross-correlation between different...
Overloading is a technique to accommodate more number of users than the spreading factor N. This is a bandwidth efficient scheme to increase the number users or data rate in a fixed bandwidth. These schemes can be used to avoid the orthogonal code shortage problem to provide broadband wireless access in cellular communication. One of the efficient schemes to overload a CDMA system is to use two sets...
Cell overloading is a bandwidth efficient scheme to increase the number of users in a fixed bandwidth for mobile applications. One of the efficient schemes to overload a CDMA system is to use two sets of orthogonal signal waveforms (O/O) [2]. An iterative soft decision interference cancellation receiver (SDIC) scheme is used to cancel interference between the two sets of users. In this paper, the...
Overloading is a technique to accommodate more users than the spreading factor N. This is a bandwidth efficient scheme to increase the number of users in a fixed bandwidth for mobile communication. One of the efficient schemes to overload a CDMA system is to use two sets of orthogonal signal waveforms (O/O). The first set is assigned to the N users and the second set is assigned to the additional...
Overloading is a technique to accommodate more number of users than the spreading factor N. This is a bandwidth efficient way to increase the number users in a fixed bandwidth. One of the efficient schemes to overload a CDMA system is to use two sets of orthogonal signal waveforms (O/O). The first set is assigned to the N users and the second set is assigned to the additional users. An iterative multistage...
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