Avneesh Agrawal

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Space-time block codes from Orthogonal Designs were proposed in [1] for communication over fading channels with multiple transmit and receive antennas. These codes require no knowledge of the channel at the transmitter, and linear processing at the receiver achieves maximum-likelihood decoding. This paper presents an alternative approach to code design,(More)
This paper proposes and analyzes an iterative power control scheme for use with successive interference cancellation (SIC) in the presence of cancellation errors. In [1], SIC is shown to increase the capacity of cellular CDMA systems significantly, even if the signal cancellation is imperfect due to estimation errors. However, an important complication of(More)
Theoretically, multi-antenna techniques offers significant capacity benefits, but realizing these gains in deployed wireless systems remains a very challenging problem. MIMO has been used in wireless LAN systems with great success. However, due to the hugely varying spatial profiles and velocity patterns of the access terminals, integrating MIMO techniques(More)
Successive interference cancellation (SIC) is a technique for increasing the capacity of cellular CDMA systems. SIC systems, due to their iterative decoding of the users, require unequal received powers. Recent work has derived a specific optimal distribution of the user powers in the inevitable event of imperfect interference cancellation. These apparent(More)
Successive Interference Cancellation (SIC) is a technique which has the potential to increase the capacity of DS-CDMA systems substantially. One of the major criticisms of the technique is that it requires a specific distribution of unequal received powers from the mobile units. In the presence of estimation error, the required distribution becomes even(More)
The paper presents MIMO field performance results observed using a Ultra Mobile Broadband (UMB) testbed network. We evaluate metrics such as antenna correlations and channel condition number to characterize the MIMO channel. Results show that low condition numbers, which are beneficial to MIMO, are prevalent for a majority of the coverage area in our(More)
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