On the effect of Multiple Access Interference in a Space Time Spreading Time Hopping PPM UWB system
Computers and Electrical Engineering
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In this article we present an ultra-wide bandwidth (UWB) wireless network for in-home cordless networking and wireless distribution of cable TV channels. The article describes the network services, the media access control, the physical link transmitter and receiver design and the link bit error rate (BER) performance. The physical link is based on an Interference Suppressing OFDM (IS-OFDM) in which the total number of frequency bins (sub-carriers) of the UWB channel is divided into groups. Every frequency bin in a group will carry all transmitted symbols for that group which are distinguished and separated from each other by orthogonal Hadamard sequences. The proposed design may then suppress narrow-band interference which is often present in UWB channels. In indoor multipath channel, IS-OFDM has also a significant advantage over ordinary OFDM, which, as shown, does not offer acceptable performance for this type of channel. The IS-OFDM link then is expected to satisfy the high bit rate needs and meet the required quality of service with a minimum transmit power so that it does not cause interference beyond the perimeter of the home.