TY - GEN
T1 - Managing the degree of impulsiveness of other cell interference
AU - Gariby, Moran
AU - Gariby, Tal
AU - Zamir, Ram
PY - 2008
Y1 - 2008
N2 - We develop mechanisms for reducing the effect of interference between un-synchronized users by means of controlling the degree of impulsiveness of their interference signals. Our analysis assumes spread-spectrum multiple-access in the form of ternary (0, +1,-1) CDMA signaling. The interference statistics of this signaling and in particular its degree of impulsiveness, can be parameterized while keeping the desired de-spread signal fixed. We find the pairs of random spreading patterns of interferer and user which minimize the bit error rate (BER) at the user, as a function of the signal/interference-to-noise ratio matrix. At low SINRs high degree of impulsiveness (single active chip per spreading sequence) minimizes the BER, while at high SINRs low degree of impulsiveness is better. We then extend our analysis to coded systems with channel state information at the receiver, and show that the same spreading pairs maximize the Exponential Effective SNR Mapping (EESM) criterion at the decoder. Finally, we propose distributed protocols which try to approach the optimal operation points (i.e., pairs of spreading patterns) in the lack of central coordination.
AB - We develop mechanisms for reducing the effect of interference between un-synchronized users by means of controlling the degree of impulsiveness of their interference signals. Our analysis assumes spread-spectrum multiple-access in the form of ternary (0, +1,-1) CDMA signaling. The interference statistics of this signaling and in particular its degree of impulsiveness, can be parameterized while keeping the desired de-spread signal fixed. We find the pairs of random spreading patterns of interferer and user which minimize the bit error rate (BER) at the user, as a function of the signal/interference-to-noise ratio matrix. At low SINRs high degree of impulsiveness (single active chip per spreading sequence) minimizes the BER, while at high SINRs low degree of impulsiveness is better. We then extend our analysis to coded systems with channel state information at the receiver, and show that the same spreading pairs maximize the Exponential Effective SNR Mapping (EESM) criterion at the decoder. Finally, we propose distributed protocols which try to approach the optimal operation points (i.e., pairs of spreading patterns) in the lack of central coordination.
UR - http://www.scopus.com/inward/record.url?scp=51249114281&partnerID=8YFLogxK
U2 - 10.1109/ICC.2008.271
DO - 10.1109/ICC.2008.271
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AN - SCOPUS:51249114281
SN - 9781424420742
T3 - IEEE International Conference on Communications
SP - 1398
EP - 1403
BT - ICC 2008 - IEEE International Conference on Communications, Proceedings
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - IEEE International Conference on Communications, ICC 2008
Y2 - 19 May 2008 through 23 May 2008
ER -