Abstract-This paper presents a novel stochastic channel model for multiple-input multiple-output (MIMO) wireless radio channels. In contrast to state-of-the-art stochastic MIMO channel models, the spatial correlation properties of the channel are not divided into separate contributions from transmitter and receiver. Instead, the joint correlation properties are modeled by describing the average coupling between the eigenmodes of the two link ends. The necessary and sufficient condition for the proposed model to hold is that the eigenbasis at the receiver is independent of the transmit weights, and vice versa. The authors discuss the mathematical elements of the model, which can be easily extracted from measurements, from a radio propagation point of view and explain the underlying assumption of the model in physical terms. The validation of the proposed model by means of measured data obtained from two completely different measurement campaigns reveals its ability to better predict capacity and spatial channel structure than other popular stochastic channel models.

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In analogy with the established discipline of room acoustics various aspects of diffuse wideband microwave propagation in a room are treated. It is shown that an equivalent to Sabine's equation for reverberation time in a room is valid for the completely diffused field, depending only on the volume, the surface area and an effective absorption coefficient. An exponential decay of the power versus delay is a consequence of the assumptions. Furthermore, the concept of a reverberation distance is also valid. This is the distance from a transmit antenna where the received diffuse, randomly scattered power equals the direct line-of-sight received power, such that the diffuse power dominates for distances larger than the reverberation distance. A number of measurements in a large room support the theory with an effective absorption coefficient of 0.5. The power delay profiles around the room from a transmitter in the ceiling vary only in the first arriving part of the impulse, whereas the tail being dominated by the diffuse field has the same power level for a given delay and the same decay rate all over the room. It is also a consequence of the theory that the incident diffuse fields on an antenna are uniformly distributed in angle. λ −))) 4ΙςΩΣΡΕΠ ΨΩΙ Σϑ ΞΛΜΩ ΘΕΞΙςΜΕΠ ΜΩ ΤΙςΘΜΞΞΙΗ 4ΙςΘΜΩΩΜΣΡ ϑςΣΘ −))) ΘΨΩΞ ΦΙ ΣΦΞΕΜΡΙΗ ϑΣς ΕΠΠ ΣΞΛΙς ΨΩΙΩ ΜΡ ΕΡ] ΓΨςςΙΡΞ Σς ϑΨΞΨςΙ ΘΙΗΜΕ ΜΡΓΠΨΗΜΡΚ ςΙΤςΜΡΞΜΡΚ ςΙΤΨΦΠΜΩΛΜΡΚ ΞΛΜΩ ΘΕΞΙςΜΕΠ ϑΣς ΕΗΖΙςΞΜΩΜΡΚ Σς ΤςΣΘΣΞΜΣΡΕΠ ΤΨςΤΣΩΙΩ ΓςΙΕΞΜΡΚ ΡΙ[ ΓΣΠΠΙΓΞΜΖΙ [ΣςΟΩ ϑΣς ςΙΩΕΠΙ Σς ςΙΗΜΩΞςΜΦΨΞΜΣΡ ΞΣ ΩΙςΖΙςΩ Σς ΠΜΩΞΩ Σς ςΙΨΩΙ Σϑ ΕΡ] ΓΣΤ]ςΜΚΛΞΙΗ ΓΣΘΤΣΡΙΡΞ Σϑ ΞΛΜΩ [ΣςΟ ΜΡ ΣΞΛΙς [ΣςΟΩ 4ΨΦΠΜΩΛΙΗ ΜΡ −))) %ΡΞΙΡΡΕΩ ΕΡΗ 4ςΣΤΕΚΕΞΜΣΡ 1ΕΚΕ⊥ΜΡΙ :ΣΠ 2Σ Τ ¥ %ΤςΜΠ (3− 1%4