This paper presents the preliminary results of a performance trial in eastern Colorado for a 6 GHz, 128 QAM, 155 Mb/s digital radio system.This system, which utilized the standard North American 30 MHz channelization plan for 6 GHz, used 128 QAM modulation to maximize system gain, minimize the impact of foreign system interference, and provide the capability to transport the 155 Mb/s, OC-3 SONET payload structure with a very low residual background bit-errorrate.The test was divided into two phases. Phase I tested system performance in a frequency/space diversity configuration. Phase 11, which is now underway, added the complexity of a cross polarization interference canceler (XPIC).The results provide a preliminary view of 128 QAM digital radio performance in a fading environment, including errored second (ES) and severe errored second (SES) performance.
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