Measurements and simulations of delay profiles in the 55-GHz band were conducted in a number of studios as part of a study on a radio transmission scheme for a studio-use HDTV wireless camera. The delay spread characteristics were analyzed, and a prediction of the average r.m.s. delay spread was plotted. According to the simulation results, the relationship between antenna separation and MIMO channel characteristics in an indoor line-of-sight (LOS) environment is discussed, and it is shown that MIMO transmission performance can be significantly improved in a situation that reflected waves exist in the studios.

The FPU (Field pickup unit) operating in the microwave frequency band is used for static and mobile relay broadcasting to transmit high-quality video resources. Although the transmission loss in this band is greater than in the 800-MHz band, a tracking system using a high-gain antenna can be used to compensate for the transmission loss. We developed a tracking and receiving system combining a phased array antenna with a function that automatically estimates the direction of arrival (DOA) for the FPU reception in the microwave frequency band. First, we explain the principle of the DOA estimation and the estimation error caused by multipath interference. Next, we describe the performance of the prototype system in an outdoor experiment. Finally, we describe the results of the trial relay system in live program transmissions.

The FPU (Field Pickup Unit) , one of the transmission systems for news materials, requires good mobility so that it can report urgent news from the scene of a disaster. Instead of using a conventional parabolic reflector antenna made of solid metal, we developed a deployable mesh reflector antenna for the FPU. The surface of the mesh reflector antenna is made of fine-gauge stainless steel wire, which enables it to be folded up like an umbrella. This antenna can increase the mobility of the FPU equipment. In this paper, we describe the design of a practical mesh reflector antenna and evaluate the relation between the antenna gain degradation and the surface deviation due to the antenna's structure.