Importance

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Abstract

Broadcasting of data packets from a hub station to many remote terminals in a two-way data network uses a spread spectrum time division multiplexed (TDM) channel. A channel in the other direction is a multiple access channel. To provide substantially equal energy per bit of the received signal at each of the remote terminals for maintaining reliability per bit at all terminals, the spreading factor of number of chips per bit is increased according to the distance of the remote terminal from the hub or the strength of the signal from the hub received by the remote terminal. The spreading factor or number of chips per bit may be changed according to the strength of the signal received by the hub from the remote terminal. Terminals positioned around the hub transmitter are located in regions arbitrarily determined by signal strengths, terrain, weather conditions or range. Fixed receivers in the closest region receive signals with the lowest spreading factor or number of chips per bit, and terminals in the furthest region or the region most affected by signal strength reduction receive signals from the hub with the highest spreading factor or number of chips per bit. Thus the energy per bit received by the most remote terminals is similar to the energy per bit received by the terminals which are closest to the hub and which receive strongest signals of data packets from the hub. Mobile remote terminals are provided with signals varying spreading factor and number of chips per bit according to the strength of the signal received from the mobile remote terminal.

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First Claim