Layered space-time receivers for frequency-selective wireless channels

Abstract

Abstract-Recent results in information theory have demonstrated the enormous potential of wireless communication systems with antenna arrays at both the transmitter and receiver. To exploit this potential, a number of layered space-time architectures have been proposed. These layered space-time systems transmit parallel data streams, simultaneously and on the same frequency, in a multiple-input multiple-output fashion. With rich multipath propagation, these different streams can be separated at the receiver because of their distinct spatial signatures. However, the analysis of these techniques presented thus far had mostly been strictly narrowband. In order to enable high-data-rate applications, it might be necessary to utilize signals whose bandwidth exceeds the coherence bandwidth of the channel, which brings in the issue of frequency selectivity. In this paper, we present a class of layered space-time receivers devised for frequency-selective channels. These new receivers, which offer various performance and complexity tradeoffs, are compared and evaluated in the context of a typical urban channel with excellent results.

Intrinsic Limits of Dimensionality and Richness in Random Multipath Fields

“…where the second inequality follows from (6) and (22) |α n | a and the last equality follows from J −n (kr) = (−1) n J n (kr). From (23) it is evident that the behavior of the truncation error depends on the properties of Bessel functions |J n (kr)| for sufficiently large n. We use the following bound for the Bessel function…”

Capacity of multiple-transmit multiple-receive antenna architectures

“…The limitation of the analysis in [5], [6] is that it is restricted to the situation where the users are symbol-synchronous. In [7], the SIR analysis of [5] was extended to the case where the users are symbol-asynchronous but chip-synchronous, i.e., the delays of all the users are aligned to the chip timing.…”

Great Expectations: The Value of Spatial Diversity in Wireless Networks

“…First, the BLAST architecture has been extended to the broadband channel scenario using a MIMO generalization of the classical DFE [9], [176]. Second, the presence of antenna correlation and the lack of scattering richness in the propagation environment reduce the achievable rates of spatial multiplexing techniques from their theoretical projections under ideal assumptions [58], [117].…”