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EXISTING SYSTEM

PROPOSED SYSTEM

EXISTING CONCEPT

We perform a comparative study of the performance of TOSD–SSK modulation and the Alamouti code under the same imperfect channel knowledge, and show that TOSD–SSK modulation is more robust to channel estimation errors. . The Alamouti coding is a Multiple Input Single Output (two transmit antennas and a single receive antenna—2x1 MISO) system, in which every constellation point is transmitted by transmitter. The first transmitter transmits the constellations without modifications while the second one transmits a slightly modified version of each pair of constellations in the reverse order in frequency.

PROPOSED CONCEPT

We show that SSK can operate effectively in LOS conditions provided that the antennas are properly placed at TX and RX such that a high-rank LOS-MIMO channel is constructed. The operating conditions for LOS-SSK with parallel uniform linear arrays are established and two schemes, namely orthogonal SSK and bi-orthogonal SSK, are introduced. The bit error probabilities for both methods are derived and given in closed form. It is shown that LOS-SSK (more generally LOS-SM) is a promising technique and might especially be attractive in millimeter-wave communications which, due to its high frequency and small wavelength, inherently prefers LOS trans mission and also enables packing of a large number of antennas in terminals

EXISTING TECHNIQUE:

Time–orthogonal design  and Alamouti code

PROPOSED TECHNIQUE:

Space Shift Keying

TECHNIQUE DEFINITION:

It has MISO concept Multiple  transmitter and single receiver.

TECHNIQUE DEFINITION:

A low–complexity implementation of  SM, which is called Space Shift Keying (SSK) modulation,

DRAWBACKS

High Complexity

Transmit power is high

ADVANTAGES

SSK reduces the system complexity

High  Bit Error performance(BER) can be achieved

power–efficient applications