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It is known that Turbo Product Codes (TPC) can be nearly optimally decoded by Chase-II algorithm, in which the Least Reliable Bits (LRBs) are chosen empirically to keep the size of the test patterns (sequences) relatively small and to reduce the decoding complexity. While there are also other adaptive techniques, where the decoder's LRBs adapt to the external parameter of the decoder like signal SNR...
This paper presents a strategy for allocating power in both space and time for beamforming space-time-coded multiantenna systems with imperfect channel state information at the transmitter (CSIT) over flat and quasi-static Rayleigh fading channels. We first develop a closed-form spatial-only (S-O) power allocation scheme based on a newly defined compressed signal-to-noise ratio (CSNR) criterion. The...
This paper presents a closed-form power allocation scheme for space-time coded multiple-antenna systems with imperfect channel state information at the transmitter. The proposed scheme is based on a so-called compressed signal-to-noise ratio (CSNR) criterion, where a single compression factor is used to minimize the bit-error-rate (BER). The obtained closed-form solution is computational efficient...
On the basis of analyzing the principle of multicarrier DS-CDMA (MC-DS-CDMA), we propose a novel multiband complex wavelet based multicarrier DS-CDMA system in this paper by using the optimized multiband complex wavelet as multicarrier basis function. The system bit error rate (BER) performance is investigated over Nakagami fading channel. Without any cyclic prefix (CP), the proposed system can avoid...
By introducing a full-rate space-time block coding (STBC) scheme, a multiuser CDMA system with full-rate STBC is presented. Meanwhile, a low-complexity multiuser receiver scheme is developed, the scheme can make full use of the complex orthogonality of STBC to simplify the high decoding complexity of the existing scheme, it has linear decoding complexity. Compared with those full-diversity space-time...
In this paper, a space-time coded adaptive MQAM scheme with variable power is developed for MIMO system. Under the target BER and average power constraint, the optimum SNR switching thresholds for the developed scheme are generated by using the Lagrange method, which can make the scheme maximize the spectrum efficiency (SE). Besides, the closed-form expressions for the SE and average BER of the scheme...
By introducing multiple levels quadrature amplitude modulation and matrix transform method; we develop a multiple amplitudes differential space-time coding (DSTC) scheme in the case of non-square code matrix. The scheme can avoid the performance loss of conventional DSTC schemes based on MPSK modulation in high spectrum efficiency, and it can be applied to non-square code matrix, thus it overcomes...
By introducing full-rate space-time block coding (STBC) scheme, a full-rate space-time block coded CDMA (FSTBC-CDMA) system for downlink in time division duplex mode is given. Considering that existing space-time coded CDMA system has high decoding complexity, a low-complexity multiuser receiver scheme is also proposed. The scheme can make full use of the complex orthogonality of STBC to simply the...
Based on the analysis of the principle of multi-carrier CDMA and the use of optimized complex orthogonal wavelet packet, a complex orthogonal wavelet packet based MC-CDMA system (COWP-MC-CDMA) is proposed in this paper. We investigate the system downlink performance with EGC technique and MRC technique in Nakagami-m fading channels, respectively; and derive corresponding bit error rate (BER) expression...
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