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In this paper, the principle of normalized minimum-sum (NMS) polar decoding process is explored. It is demonstrated that with one properly chosen parameters for NMS algorithm, performances approach to that of the sum-product (SP) algorithm can be achieved. As well, the complexity reduction is realized by calculating a linear function instead of nonlinear function. Simulation results for successive...
We consider polar coded BPSK receiver performance improvement based on the concepts of channel log-likelihood ratio (LLR) approximation and the maximum achievable transmission rate on fading channel. Based on symmetry condition of random variables, uniform scaling factors are applied to correct soft messages at the absence of channel state information (CSI) at the receiver side. The searching method...
Motivated by large capacity gains in multiple antenna systems when ideal channel state information (CSI) is available at both receiver and transmitter when quadrature amplitude modulation (QAM) modulation is applied, we examine the achievable rates of Rayleigh fading channel measurement based optimization techniques. We consider complex-valued AWGN noise and try to determine the optimal input distribution...
In this paper, we present a nonuniform quantizer based on the condition of maximum information rate achieved over uncorrelated Rayleigh fading channel and when successive cancellation (SC) decoding algorithm of polar codes is applied. Based on symmetry condition of random variables, we start with theoretical model where uniform scaling factors are applied to correct soft messages at the absence of...
In this paper, the principle of density evolution (DE) combined with the normalized minimum-sum (NMS) decoding process is explored. It is demonstrated that with one properly chosen parameters for NMS algorithm, then almost the same behaviour of sum-product (SP) algorithm is achieved. As well, the complexity reduction is realized by calculating a linear function instead of nonlinear function. Simulation...
This paper presents a low-complexity approach for calculating soft decision metrics of polar coded quadrature amplitude modulation (QAM) system. A simple and general bit log likelihood ratio (LLR) expression is provided for Gray coded QAM signals. The characteristics of Gray code mapping such as symmetries and repeated formats of the bit assignment in a symbol among bit groups, are exploited effectively...
Polar codes, ever since their introduction, have been shown to be very effective for various wireless communication channels. This, together with their relatively low implementation complexity, has made them an attractive coding scheme for wireless communications. Polar codes have been extensively studied for use with binary-input symmetric memoryless channels but little is known about their effectiveness...
Polar codes, ever since their introduction, have been shown to be very effective for various wireless communication channels. This together with their relatively low implementation complexity has made polar codes an attractive coding scheme for wireless communications. On the other hand, within the realm of non-coherent wireless MIMO communication, Grassmannian signalling has been shown to approach...
In this paper we consider a multiuser detection scheme where K users, each with NT transmit antennas, transmit their symbols simultaneaously using space-time block coding (STBC). Previously, it was shown that a receiver can completely separate signals of K users, where each user has two antenna and uses Alamouti coding, using a number of receive antennas equals to or greater than the number of users...
In this paper we propose a new Multiple-Input Multiple-Output (MIMO) transmission scheme that combines the generalised spatial modulation (GSM) with MIMO spatial multiplexing technique. Unlike the GSM which uses NA active antennas to transmit the same symbol, the proposed scheme uses the NA antennas to transmit different symbols simultaneously, which leads to increase the spectral efficiency of the...
In this paper we propose a multiuser two-way relaying scheme using an XOR-and-forward strategy with space-time block coding (STBC). In this scheme, all users transmit their symbols simultaneously to the relay in the first phase. The relay uses minimum mean square error detection to estimate the transmitted symbols, and then it uses an XOR operation to combine the estimates of the symbols for each...
In this paper we investigate the performance of two-way relaying that uses Alamouti space-time block code (STBC) and network coding. In this scheme, two nodes use Alamouti STBC to transmit their symbols to the relay consecutively in two phases. The relay detects and demodulates the transmitted symbols from the nodes, and then uses the bitwise-XOR operation to combine the detected bits. Then the relay...
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