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An uncoded IDMA system with chip accumulation for partial users is proposed. The rate-1 accumulators are employed for partial users. Simulation gives an optimal number Ks of partial users for K-user uncoded IDMA system with the lowest BER. Simulation results show that the performance of the proposed system is improved, compared with the conventional IDMA system, especially for few users and in high...
In this paper, we analyze the bit error rate (BER) performance of a single relay selection with network coding (S-RS-NC) scheme in two-way relay channels. In this scheme, two source nodes first broadcast their information to the relays sequentially. A single relay which optimizes the system performance is selected. The selected relay decodes the received signals from two sources, performs network...
Decentralized multiple access networks require dynamic spectrum allocation to efficiently and fairly allocate resources among multiple users. In this paper, we consider the problem of spectrum allocation from the standpoint of diversity combining, and in particular as an explicit case of selection combining (SC). General order selection allocation (GOSA) was previously proposed by the authors as a...
In this paper, we consider a multiple-relay network. We propose differential modulation at each communication node and selective combining method at the receiver. As both differential modulation and the selective combining do not require the full channel state information, the system design is greatly simplified without compromising much of the system performance. The average BER for this multiple-relay...
In this paper, the error performance of an uncoded multiple-input-multiple-output (MIMO) scheme combining single transmit antenna selection and receiver maximal-ratio combining (the TAS/MRC scheme) is investigated for flat Nakagami-m fading channels with arbitrary values of m ges 1/2. The exact symbol error rate (SER) expressions are developed based on the moment generating function (MGF) method for...
An adaptive coded multiple-input multiple-output (MIMO) system with outdated channel state information (CSI) at the transmitter is proposed and investigated. By incorporating the rate-compatible punctured codes (RCPCs) and bit-interleaved coded modulation (BICM) into the adaptive MIMO system, the proposed adaptive RCPC-BICM MIMO system is shown to achieve both a near-full multiplexing gain and a robust...
In this paper, we propose three different transmit antenna selection schemes with reduced feedback requirement compared with the conventional scheme. In Scheme 1, all the Lt available transmit antennas are divided as equally as possible into two groups. The best single antenna within each group is selected. In Scheme 2, only the best one among Lt antennas is made known to the transmitter, and the...
In this paper, the error performance of an uncoded multiple-input-multiple-output (MIMO) scheme combining single transmit antenna selection and receiver maximal-ratio combining (the TAS/MRC scheme) is investigated for flat Nakagami-m fading channels with binary phase-shift keying (BPSK) modulation. The asymptotic bit error rate (BER) expression is derived, which indicates a diversity order equal to...
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