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| The mobile outdoor radio environment is challenging for vehicular communications. Although multipath propagation offers diversity and benefits in non-line-of-sight (NLOS) conditions, simultaneous multipath and mobility results in a doubly-selective fading channel. In practice, this means that the channel parameters vary significantly in both time and(More)
Motivated by the potential to reuse the decoder architecture, and thus reduce circuit space, we explore the use of iterative encoding techniques which are based upon the graphical representation of the code. We design codes by identifying associated encoder convergence constraints and also eliminating some well known undesirable properties for sum-product(More)
Physical layer network coding (PNC) has the potential to improve the spectral efficiency of wireless relay communications by utilising the superposition of signal propagation. In the ideal case, PNC can double the throughput of a symmetric relay network when compared to conventional time division multiplexing. However, in practice imperfect channel(More)
Spatial multiple-input multiple-output (MIMO) offers increased rate and/or reliability in rich scattering environments such as that of a multipath non-line-of-sight (NLOS) channel. In line-of-sight (LOS) dominated conditions, spatial diversity is reduced. Dual polarisation signalling has been shown to successfully exploit polarisation diversity when LOS is(More)
We investigate algebraic constructions for a class of iteratively encodable low-density parity-check codes suitable for high rate applications. The iterative encoding technique, which is based upon the graphical representation of the code, allows the decoder circuit to be also used for encoding, thus saving circuit area. A method for constructing a(More)
We present a novel time-multiplexed codec for a class of low-density parity-check codes, which switches between analog decode and digital encode modes. In order to achieve this behaviour from a single circuit we have developed modeswitching gates. These logic gates are able to switch between analog (soft) and digital (hard) computation. Only a small(More)
Low-density parity-check (LDPC) codes may be decoded using a circuit implementation of the sum-product algorithm which maps the factor graph of the code. By reusing the decoder for encoding, both tasks can be performed using the same circuit, thus reducing area and verification requirements. Motivated by this, iterative encoding techniques based upon the(More)