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- Ge Li, Ivan J. Fair, Witold A. Krzymien
- IEEE Transactions on Information Theory
- 2009

This paper extends the work on density evolution for binary low-density parity-check (LDPC) codes with Gaussian approximation to LDPC codes over GF(q) . We first generalize the definition of channel symmetry for nonbinary inputs to include q-ary phase-shift keying (PSK) modulated channels for prime q and binary-modulated channels for q that is a power of 2.… (More)

- Jia Liu, Witold A. Krzymien
- Wireless Personal Communications
- 2007

- Ivan J. Fair, Wayne D. Grover, Witold A. Krzymien, R. Ian MacDonald
- IEEE Trans. Communications
- 1991

- Shreeram Sigdel, Witold A. Krzymien
- IEEE Trans. Vehicular Technology
- 2009

- Saeed Kaviani, Osvaldo Simeone, Witold A. Krzymien, Shlomo Shamai
- IEEE Trans. Vehicular Technology
- 2012

A cellular multiple-input multiple-output (MIMO) downlink system is studied in which each base station (BS) transmits to some of the users, so that each user receives its intended signal from a subset of the BSs. This scenario is referred to as network MIMO with partial cooperation, since only a subset of the BSs are able to coordinate their transmission… (More)

- Jia Liu, Witold A. Krzymien
- IEEE Trans. Vehicular Technology
- 2006

- Saeed Kaviani, Witold A. Krzymien
- 2008 IEEE Wireless Communications and Networking…
- 2008

We consider cooperative downlink transmission in multiuser, multi-cell and multiple-antenna cellular networks. It has been shown that multi-base coordinated transmission has significant spectral efficiency gains over that without coordination. The capacity limits can be achieved using a non-linear preceding technique known as dirty paper coding, which is… (More)

- Zhengang Chen, Tyler L. Brandon, Duncan G. Elliott, Stephen Bates, Witold A. Krzymien, Bruce F. Cockburn
- IEEE Trans. on Circuits and Systems
- 2010

- Boon Chin Lim, Witold A. Krzymien, Christian Schlegel
- IEEE Trans. Vehicular Technology
- 2009

- Saeed Kaviani, Witold A. Krzymien
- GLOBECOM
- 2010

We consider a coordinated multicell multipleantenna downlink transmission in a cellular network also known as network MIMO, which is expected to play a key role in future broadband cellular systems. While clustered network MIMO is a practical scheme to benefit from multicell cooperation, it still suffers from inter-cluster (uncoordinated) interference… (More)