WHITE PAPER: A New Cellular System  
Author: Razmik Hakobyan (razmikh@boomerang.am)

 Collision is a serious problem during data transmission in communication systems. Collisions reduce the data throughput rate and sometimes even result in complete data transfer failure.

In the Cellular Systems Wi-Fi, WiMAX, 3G, 4G, LTE and the like wireless networks, collision may occur when the Mobile Station (MS) attempts to join the network (network entry phase) and when the MS performs a handover to maintain connectivity to the network by  moving from one Base Station (BS) to another BS while moving throughout the coverage area.  The impact of handovers between Base Stations is a serious problem in mobile communication systems. During a handover, packets may be delayed and connections may be dropped. Real-time applications such as VoIP and streaming video can be adversely affected by these delays.  In the Telecommunications and Cellular Systems different solutions are used in order to avoid collision. It results in decreasing the data throughput rate and increasing complexity of the system.  

Moreover spectral efficiency of the existing technologies for data transfer is lower.  In the Cellular Systems based on the OFDM technology BPSK gives 1 bits/Hz spectral efficiency and is the most durable mode, however system capacity can be increased using QPSK (2 bits/Hz), 16PSK (4 bits/Hz) etc. but at the cost of a higher BER (Bit Error Rate).  Using BPSK (1bits/Hz) the OFDM transmission can tolerate a SNR (Signal to Noise Ratio) of > 6-8 dB. Using 16PSK (4bits/Hz) can increase the system capacity if the SNR is > 25 dB. In order to increase spectral efficiency in OFDM systems it is needed to increase the power, emitted by antenna.  For the same communication distance the power emitted by the antenna in 16PSK (4bits/Hz) mode should exceed by approximately 20 dB (100 times) with respect to power emitted in the BPSK (1bits/Hz) mode. This has a negative impact on human’s health.   

Nowadays there is a great demand for developing cellular systems which can provide:

• Seamless mobility handover without loss and delaying of packets and disruption of the data transfer;
• High spectral efficiency without increasing of the SNR.

To solve these tasks by using existing technologies is impossible. Solving these problems requires a new technology that must not be sensitive to collision.
 We have developed and patented a new method for data transfer, which solves these problems.  The method enables carrying out data transfer with low BER despite presence of interference (collision).   The method also allows increasing system capacity (spectral efficiency) without increasing the SNR. Transmission by the developed method can tolerate a SNR of ≥ 6-7 dB no matter in which mode the transmission is performed in 1bits/Hz or 4bits/Hz or (5 and more) bits /Hz. It enables decreasing the power emitted by antenna and respectively decreasing the adverse effect of the power emitted on human’s health.  
 The method developed can become the basis for creating next generation telecommunication systems. Such uses include: Cellular Systems, Telecommunication Systems, network cards, PC to base to PC, LAN and WANs, PDA, RFID, Location and Tracking Systems, Security Systems or other wired and wireless communications. It provides substantial enhancement of accuracy of data transmission, speed, security of content, and longer distance coverage than all existing models.

On the basis of the patented method we have developed a Cellular System.  The Cellular System developed enables:  

• Carrying out seamless mobility handover without loss and delay of packets and disruption to data communications.
• Increasing the data throughput rate.
• Increasing system capacity (spectral efficiency) without increasing the SNR.
• Decreasing power emitted by the antenna and respectively decreasing the adverse effect of the power emitted on human’s health.  
• High accuracy (low BER) data communications even in existing interference (collision).  
• Separating useful signal from interference and distributing these signals to different channels and simultaneously receiving and processing both useful and interference signals.
• Separating the direct signal from the reflected signals in the multipath case and distributing these signals to different channels and simultaneously processing both direct and reflected signals.

 For more information please contact author at E-mail:  razmikh@boomerang.am