The Puzzler - August 2010

Radio Communications

Across

1 The state of play of MIMO OTA standardization in
3 GPP is summarized in this document, which is in the study phase prior to formal standardization
8 The CTIA uses the term Total Isotropic Sensitivity (TIS) for this figure of merit (3 words)
12 Signal to noise ratio
13 AOA (3 words)
15 A method of digital modulation in which a signal is split into several narrowband channels at different frequencies
16 TRP (3 words)
18 The parameter used to assess how much of the DUT radiated power is absorbed by the human body (3 words)
19 MIMO systems take advantage of the spatial domain to realize increased ___________ (2 words)
20 A system that is designed to take advantage of reflections to measure the power radiated from a device (2 words)
21 Multiple-input multiple-output over-the-air (2 words)
22 The generalized distribution of a complex random variable that reflects the central limit theorem of combined
random variations in phase and amplitude (2 words)

Down

2 Fading distribution with stronger line-of-sight components than a combination of all the random variations (2 words)
3 The quantitative measure of this similarity in received signals in a MIMO system (2 words)
4 An anechoic chamber creates a reference environment with a controlled ___________ that zeros out all the signal channel variables (2 words)
5 International Association for the Wireless Telecommunications Industry
6 A test system that is lined with RF absorber to prevent these reflections and ensure that the only RF energy measured
is that transferred line-of-sight (2 words)
7 Single-input single-output
9 EMC (2 words)
10 A system for air interface testing, replacing the real-world radio channel between a transmitter and a receiver (2 words)
11 Techniques used to randomize the field structure to ensure that there are no standing wave resonances within the test volume
14 Wideband Code Division Multiple Access
17 3rd Generation Partnership Project
23 The most widely used standard for mobile telephony systems
24 Specific Anthropomorphic Mannequin phantom head nickname