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In Fig. 2-22, there are four stations that can transmit....

Key Concepts

Walsh/Hadamard Codes

Walsh or Hadamard codes are common examples of orthogonal codes used in spread spectrum systems. These codes are generated using Hadamard matrices and are structured in a way that supports a specific number of users or channels. They are particularly useful in systems employing code division multiple access (CDMA) because their orthogonality enables efficient separation of signals from different users.

Orthogonal Codes

Orthogonal codes are specially designed sequences that maintain minimal cross-correlation with one another, meaning their inner product is zero. This property ensures that when multiple users transmit simultaneously, the receiver can separate the signals by correlating the composite signal with each unique code, thereby reducing interference between channels.

Spread Spectrum Communication

This is a communication technique in which the transmitted signal is spread over a wide frequency band, significantly larger than the minimum required bandwidth. This approach increases resistance to interference, improves security, and enables multiple users to share the same frequency band with minimal interference.

Chip Sequences

Chip sequences are short binary codes used to modulate the original data signal in spread spectrum systems. They serve as the spreading codes that determine how the data is spread over the bandwidth. Each station or user is assigned a unique chip sequence to ensure that data can be distinguished at the receiver even when multiple signals overlap.

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